{"id":4478,"date":"2025-08-19T11:05:01","date_gmt":"2025-08-19T11:05:01","guid":{"rendered":"https:\/\/www.prepaway.net\/certification-training\/?p=4478"},"modified":"2025-12-06T09:07:11","modified_gmt":"2025-12-06T09:07:11","slug":"cisco-aci-interview-questions-answers-deep-dive-architecture-terminologies-core-concepts","status":"publish","type":"post","link":"https:\/\/www.prepaway.net\/certification-training\/cisco-aci-interview-questions-answers-deep-dive-architecture-terminologies-core-concepts\/","title":{"rendered":"Cisco ACI Interview Questions and Answers: A Deep Dive into Architecture, Terminologies, and Core Concepts"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Cisco Application Centric Infrastructure (ACI) is a next-generation data center and cloud networking solution that brings a software-defined approach to traditional hardware-centric environments. By focusing on applications instead of individual devices, ACI enables organizations to accelerate operations, automate workflows, and implement scalable, policy-driven infrastructure.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">With ACI, network policies and services are defined centrally and applied uniformly across the entire fabric. This model delivers better control, operational simplicity, and adaptability to dynamic workload requirements.<\/span><\/p>\r\n<h2><b>Core Components of Cisco ACI<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Cisco ACI is built around three key components that work in harmony:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Application Policy Infrastructure Controller (APIC) \u2013 Acts as the centralized controller for the ACI fabric, managing policies and configurations.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Leaf Switches \u2013 Serve as the access layer and connect to all endpoints like servers and firewalls.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Spine Switches \u2013 Provide interconnectivity between leaf switches; they never connect directly to endpoints.<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">This spine-leaf topology simplifies east-west traffic flow, optimizes performance, and scales horizontally without introducing bottlenecks.<\/span><\/p>\r\n<h2><b>What Makes ACI Different from Traditional Networks?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Traditional networks require manual, device-by-device configuration and maintenance. ACI, in contrast, is designed for automation, application awareness, and centralization. It abstracts the hardware and allows network administrators to define intent via policies that are automatically enforced throughout the infrastructure.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">This shift from CLI-based configurations to policy-based models reduces complexity, minimizes errors, and shortens deployment times.<\/span><\/p>\r\n<h2><b>What is the Role of the APIC?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">The Application Policy Infrastructure Controller (APIC) is the operational heart of the Cisco ACI architecture. It provides:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Centralized policy management<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Fabric automation<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Health monitoring<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Integration APIs<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">Unlike traditional controllers that handle traffic forwarding, the APIC only handles orchestration and policy distribution. Traffic continues to flow through the spine-leaf switches, which are optimized for high-performance packet forwarding.<\/span><\/p>\r\n<h2><b>What is a Tenant in Cisco ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">A tenant is a logical segmentation construct within ACI that isolates policies, address spaces, and configurations. Each tenant can represent a different department, customer, or project, with its own:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Application profiles<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Bridge domains<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">EPGs<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Contracts<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">This structure allows multi-tenancy within the same physical infrastructure without compromising security or performance.<\/span><\/p>\r\n<h2><b>What is an Endpoint Group (EPG)?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Endpoint Groups (EPGs) are one of the most critical constructs in Cisco ACI. They logically group endpoints that require similar network policies. Examples of endpoints include virtual machines, bare-metal servers, or containers.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Within an EPG, communication is unrestricted. Communication between EPGs, however, must be explicitly allowed using <\/span><b>contracts<\/b><span style=\"font-weight: 400;\">. EPGs simplify the application of security and forwarding policies across diverse endpoint types.<\/span><\/p>\r\n<h2><b>What is an Application Profile?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">An Application Profile represents a logical container that defines how an application is structured within a tenant. It contains EPGs and specifies the communication policies (contracts) between them.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">This model allows for centralized, repeatable policy definitions that match the architecture of actual applications (e.g., web tier, application tier, and database tier), making deployments easier and more consistent.<\/span><\/p>\r\n<h2><b>What is a Bridge Domain (BD)?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">A Bridge Domain in ACI is a Layer 2 forwarding domain. It associates a subnet and provides settings for:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">MAC address learning<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Broadcast and unknown unicast flooding<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">ARP handling<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">A BD can be linked to one or multiple EPGs and operates within the scope of a Virtual Routing and Forwarding (VRF) instance. BDs are essential for isolating Layer 2 traffic within a tenant.<\/span><\/p>\r\n<h2><b>What is a VRF in Cisco ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">A Virtual Routing and Forwarding (VRF) instance allows multiple routing tables to coexist within the same fabric. In Cisco ACI, VRFs are used to isolate Layer 3 routing contexts among tenants.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Each tenant can have its own VRF, enabling overlapping IP addresses across different tenants without conflict. VRFs ensure secure and isolated communication paths.<\/span><\/p>\r\n<h2><b>What are Contracts in Cisco ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Contracts define the rules for communication between EPGs. They include:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Filters: Define the type of traffic allowed (e.g., HTTP, HTTPS, SSH)<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Subjects: Apply filters and additional policies<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Actions: Permit, deny, or log traffic<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">Without a contract, EPGs cannot communicate, even if they reside in the same tenant. Contracts enforce security and service chaining by controlling what traffic is allowed and how it is handled.<\/span><\/p>\r\n<h2><b>How Does Policy Enforcement Work in ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Policy enforcement in ACI is decentralized. While the APIC defines and distributes policies, enforcement occurs at the leaf switches. This ensures high performance and low latency by avoiding the need to backhaul traffic through a central controller.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Leaf switches match traffic to endpoint groups and apply the relevant policies, such as access control, quality of service, and service redirection.<\/span><\/p>\r\n<h2><b>What is the Importance of Policy-Based Automation in ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Policy-based automation allows administrators to define intent\u2014such as application connectivity, security, or service levels\u2014and have the fabric automatically apply the necessary configurations. This eliminates the need for repetitive, error-prone manual tasks.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Benefits include:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Reduced operational overhead<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Faster application deployment<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Consistent policy enforcement<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Improved agility and scalability<\/span><\/li>\r\n<\/ul>\r\n<h2><b>What is Fabric Discovery in Cisco ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Fabric discovery is the initial process through which APIC learns about the physical switches and establishes control over them. It starts when an APIC is connected to a leaf switch. The APIC discovers:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Leaf switches<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Connected spine switches<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Fabric topology<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">Discovery uses Link Layer Discovery Protocol (LLDP) and automatically assigns unique IDs to switches. Once complete, the fabric is ready for policy deployment and endpoint integration.<\/span><\/p>\r\n<h2><b>What Protocols are Used in Cisco ACI Fabric?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Cisco ACI relies on several protocols:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">ISIS: For fabric routing between leaf and spine switches<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <\/span><span style=\"font-weight: 400;\"><br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">MP-BGP EVPN: For Layer 2\/Layer 3 overlay encapsulation<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">VXLAN: For tunneling endpoint traffic across the fabric<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">LLDP: For fabric discovery<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">These protocols work behind the scenes to ensure dynamic path selection, endpoint learning, and encapsulation without manual configuration.<\/span><\/p>\r\n<h2><b>How Does ACI Handle Endpoint Learning?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">ACI uses distributed endpoint learning across leaf switches. When an endpoint connects to the fabric, the leaf switch learns its MAC and IP address, along with the associated EPG. This information is shared with other switches using the COOP protocol and stored in a central database managed by APIC.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">This dynamic learning ensures that endpoint mobility is preserved and that policies are applied consistently, regardless of where the endpoint moves in the fabric.<\/span><\/p>\r\n<h2><b>What is the Role of VXLAN in ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">VXLAN (Virtual Extensible LAN) is the encapsulation protocol used by Cisco ACI to transport Layer 2 traffic across the Layer 3 spine-leaf fabric. Each EPG is assigned a VXLAN Network Identifier (VNID), which allows logical segmentation and isolation of traffic.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">VXLAN provides the scalability required for large data centers, supporting thousands of isolated networks over a shared IP infrastructure.<\/span><\/p>\r\n<h2><b>What is an Access Policy in ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Access policies are configurations related to how endpoints connect to the fabric. This includes:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Interface policies<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Switch profiles<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Interface selectors<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">AEP (Attachable Entity Profile)<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">Access policies are typically defined once and reused across multiple interfaces and deployments. They map physical or virtual interfaces to logical constructs like EPGs.<\/span><\/p>\r\n<h2><b>What is an Attachable Entity Profile (AEP)?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">An AEP binds physical interfaces or ports to policies such as VLAN encapsulation and EPG association. It acts as a bridge between access policies and logical profiles and helps ensure that endpoints receive the correct configurations when connected to the fabric.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">AEPs simplify operations by allowing bulk assignment of policy templates to interfaces based on how and where endpoints connect.<\/span><\/p>\r\n<h2><b>How are Fabric Policies Different from Access Policies?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Fabric policies control the internal behavior of the ACI fabric\u2014things like routing protocols, multicast behavior, and system resources. Access policies, on the other hand, define how external devices (e.g., servers, VMs) connect to the ACI fabric.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">This separation of concerns ensures clarity and modular configuration, making the network easier to manage and troubleshoot.<\/span><\/p>\r\n<h2><b>What is the Role of Filters in Contracts?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Filters are specific rules that define which traffic types are allowed between EPGs. For example, a filter might specify:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Protocol (TCP, UDP, ICMP)<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Port numbers (e.g., 80 for HTTP, 443 for HTTPS)<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">These filters are applied within contracts to enforce access control and service policies.<\/span><\/p>\r\n<h2><b>What is the role of Logical Interfaces (LIFs) in Cisco ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Logical Interfaces (LIFs) are software-defined interfaces used to manage how traffic flows across the fabric. A LIF acts as a termination point for the VXLAN tunnel on the leaf switch. When traffic enters the fabric, it is encapsulated and passed through the LIF, which ensures that policies such as segmentation and forwarding are applied consistently.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">LIFs support both routed and bridged traffic and are central to the operation of ACI\u2019s policy enforcement across distributed workloads.<\/span><\/p>\r\n<h2><b>How does Cisco ACI support Layer 4\u20137 service integration?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">ACI integrates with external Layer 4\u20137 services like firewalls, load balancers, and IPS devices. These integrations are accomplished via <\/span><b>service graphs<\/b><span style=\"font-weight: 400;\">, which define how traffic flows through these services.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">ACI supports both manual and automated insertion of services:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Managed mode: APIC programs the device directly through plugins or APIs.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Unmanaged mode: External devices are configured manually but connected to the fabric.<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">This tight integration ensures traffic passes through required security or performance-enhancing functions while maintaining automation and visibility.<\/span><\/p>\r\n<h2><b>What is a Service Graph in Cisco ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">A Service Graph is a logical representation of how traffic should flow through one or more Layer 4\u20137 devices between EPGs. It defines:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Device nodes (e.g., firewalls, load balancers)<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Paths (traffic direction)<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Function chaining (order of devices)<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">For example, a three-tier web application might use a Service Graph to force incoming traffic through a firewall, then a load balancer, before reaching web servers. These graphs are policy-driven and programmable through APIC.<\/span><\/p>\r\n<h2><b>How does Cisco ACI support multi-site or hybrid deployments?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Cisco ACI offers multiple options for extending the fabric across geographically distributed locations:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">ACI Multi-Site: Allows independent ACI fabrics to be connected and managed via a central controller called Multi-Site Orchestrator (MSO). Each site retains autonomy, but shared policies ensure consistency.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">ACI Remote Leaf: Connects remote leaf switches back to a centralized spine.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">ACI Stretched Fabric: Extends a single fabric across sites while maintaining a unified control plane.<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">These options support disaster recovery, workload mobility, and global policy enforcement.<\/span><\/p>\r\n<h2><b>What is the Cisco Multi-Site Orchestrator (MSO)?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">MSO is a software solution that simplifies the management of multiple ACI sites. It provides:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Centralized policy definition across sites<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tenant and schema templates<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Inter-site connectivity monitoring<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">MSO allows administrators to push consistent configurations and policies to all ACI sites, improving governance and reducing administrative overhead in large-scale environments.<\/span><\/p>\r\n<h2><b>How does ACI handle high availability and redundancy?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">ACI is designed with redundancy at every level:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Spine-leaf topology ensures there\u2019s no single point of failure in traffic forwarding.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">APIC clusters use three or more controllers to ensure controller-level fault tolerance.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Redundant links and power in hardware support resilience.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">If a leaf or spine switch fails, traffic is automatically rerouted. Similarly, if an APIC node fails, the remaining nodes maintain fabric operation and configuration management.<\/span><\/p>\r\n<h2><b>What are Fabric Access Policies and why are they important?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Fabric Access Policies define how physical interfaces on the ACI fabric are configured to connect to endpoints. They include:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Interface policies (e.g., speed, LLDP settings)<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Interface selectors (range of ports)<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Switch profiles (specific leaf switches)<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">AEPs (Attachable Entity Profiles)<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">These policies decouple physical configuration from logical behavior, enabling reuse across multiple deployments and interfaces. This modularity speeds up provisioning and reduces errors.<\/span><\/p>\r\n<h2><b>What is an AEP (Attachable Entity Profile)?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">An AEP is a reusable template that maps physical interfaces to logical configurations. It acts as a glue between access policies and endpoint groups. For example, an AEP may specify VLAN encapsulation and associate interfaces with EPGs and domains.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Once an AEP is configured, it can be applied to multiple ports, enabling efficient provisioning and scalability.<\/span><\/p>\r\n<h2><b>What are Interface Selectors and Switch Profiles in ACI?<\/b><\/h2>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Interface Selector: Identifies one or more physical ports (e.g., Ethernet1\/1 to Ethernet1\/48) to which a policy will be applied.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Switch Profile: Associates specific leaf switches with interface selectors and their policies.<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">These constructs ensure that correct configurations are applied to the appropriate physical interfaces, streamlining the deployment process and improving maintainability.<\/span><\/p>\r\n<h2><b>What is a Policy Group in Cisco ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">A Policy Group is a collection of policies that define operational parameters for interfaces. Types include:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Access Port Policy Groups \u2013 For single port configurations.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Port Channel Policy Groups \u2013 For aggregating multiple links.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">VPC Policy Groups \u2013 For virtual port channels.<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">Policy Groups make it easy to apply consistent configurations across interfaces, such as enabling CDP, LLDP, or setting MTU values.<\/span><\/p>\r\n<h2><b>How does Cisco ACI handle Quality of Service (QoS)?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Cisco ACI implements QoS by defining <\/span><b>QoS Classes<\/b><span style=\"font-weight: 400;\"> and <\/span><b>Policies<\/b><span style=\"font-weight: 400;\"> in the APIC. These configurations ensure that latency-sensitive traffic like voice or video is prioritized over less critical data. QoS in ACI allows:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Traffic classification<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Rate limiting<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Priority queuing<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Traffic shaping<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">QoS policies are applied at the leaf switch level and ensure end-to-end service quality across the fabric.<\/span><\/p>\r\n<h2><b>How does ACI integrate with virtualization platforms?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">ACI supports deep integration with major virtualization platforms like:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">VMware vSphere and NSX<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Microsoft Hyper-V<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Red Hat OpenStack<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Kubernetes<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">APIC can integrate with hypervisors to discover virtual machines, assign EPGs dynamically, and apply security policies automatically. This enables <\/span><b>VM-level micro-segmentation<\/b><span style=\"font-weight: 400;\"> and dynamic policy enforcement across virtual workloads.<\/span><\/p>\r\n<h2><b>What is Micro-Segmentation in ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Micro-segmentation allows policies to be applied at the individual workload or VM level, even within the same subnet or EPG. It enhances security by restricting east-west traffic among endpoints based on attributes like:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">VM name<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Operating system<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tags or labels<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">This fine-grained control prevents lateral movement in the event of a compromise and enforces least-privilege access principles.<\/span><\/p>\r\n<h2><b>What are Domains in Cisco ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Domains define the boundary between the ACI fabric and external entities. There are two main types:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Physical Domain: Represents bare-metal servers or appliances connected via Ethernet.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">VMware Domain \/ VMM Domain: Used for integration with virtualization environments like VMware vCenter.<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">Domains allow for dynamic binding between EPGs and interfaces using AEPs, streamlining how endpoints are discovered and policy is applied.<\/span><\/p>\r\n<h2><b>What are External Routed Networks (L3Out)?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">An L3Out is a logical representation of an external Layer 3 connection in ACI. It enables communication between internal ACI endpoints and external networks. Components of an L3Out include:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">External EPGs<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Routed interfaces<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">BGP or OSPF peering<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Contracts for traffic control<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">L3Outs are essential for connecting to the internet, WAN, or legacy networks, and are configured with policies for route redistribution and access control.<\/span><\/p>\r\n<h2><b>What are Bridge Domains with ARP Flooding enabled?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">In specific scenarios, such as with legacy applications or unknown endpoint discovery, administrators may enable <\/span><b>ARP Flooding<\/b><span style=\"font-weight: 400;\"> in Bridge Domains. This causes ARP requests to be broadcasted within the domain.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">However, ARP Flooding is generally discouraged in modern ACI designs, as the fabric can handle ARP more efficiently through its distributed endpoint learning and proxy ARP mechanisms.<\/span><\/p>\r\n<h2><b>How does ACI handle Endpoint Mobility?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">ACI supports seamless endpoint mobility, which allows endpoints to move within the fabric without requiring manual reconfiguration. This is possible because:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Endpoint information (MAC\/IP bindings) is learned dynamically.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Policies are associated with EPGs rather than static IPs.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">COOP protocol updates the endpoint location throughout the fabric.<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">This capability is ideal for dynamic environments like virtualized data centers and cloud-native workloads.<\/span><\/p>\r\n<h2><b>What is the Role of the COOP Protocol in Cisco ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">It keeps track of endpoint location mappings (e.g., which leaf switch a particular MAC or IP address is attached to).<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">When traffic destined for an endpoint enters the fabric, the spine switch uses COOP to identify the correct leaf switch. This eliminates flooding and speeds up convergence when endpoints move.<\/span><\/p>\r\n<h2><b>How is Traffic Encapsulated in Cisco ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Cisco ACI uses VXLAN as its encapsulation protocol. Each EPG and tenant is assigned a unique VNID (VXLAN Network Identifier). When traffic enters the fabric, it is:<\/span><\/p>\r\n<ol>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Encapsulated with VXLAN headers<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Forwarded across the spine-leaf topology<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Decapsulated at the destination leaf switch<\/span><\/li>\r\n<\/ol>\r\n<p><span style=\"font-weight: 400;\">This process provides isolation between tenants and enables the creation of overlay networks on shared physical infrastructure.<\/span><\/p>\r\n<h2><b>How does Cisco ACI simplify network troubleshooting?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Cisco ACI provides multiple tools and features to make troubleshooting intuitive and proactive:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Health Scores: Real-time metrics across tenants, interfaces, applications, and fabric nodes help identify problem areas.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Faults and Events: Alerts generated automatically with severity levels and timestamps.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Atomic Counters: Track policy drops at the leaf level and help pinpoint policy enforcement issues.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Traceroute in APIC GUI: Visual representation of traffic paths between endpoints.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Endpoint Tracker: Displays endpoint history, location changes, and current leaf connectivity.<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">This centralized visibility, combined with policy-driven architecture, allows engineers to isolate and resolve issues faster than in traditional networks.<\/span><\/p>\r\n<h2><b>What is the purpose of Health Scores in Cisco ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Health scores provide a real-time numerical representation (0\u2013100) of the operational status of components within the ACI fabric. These components include:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tenants<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Application Profiles<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">EPGs<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Interfaces<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Switches<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Services<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">A score below 100 indicates a deviation from optimal performance. This could be due to a link failure, misconfiguration, or policy conflict. Engineers use these scores to prioritize actions, perform root cause analysis, and maintain fabric stability.<\/span><\/p>\r\n<h2><b>What are Faults and Events in APIC?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Faults and events are automatically generated messages within the APIC system that alert administrators to abnormal behaviors or failures. They are categorized by severity (critical, major, minor, warning, info) and include:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Timestamp of occurrence<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Affected object (e.g., interface, switch)<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Suggested resolution<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Lifecycle state (raised, cleared, acknowledged)<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">These logs are essential for proactive monitoring and serve as audit trails during troubleshooting and compliance checks.<\/span><\/p>\r\n<h2><b>How does Atomic Counters assist in troubleshooting traffic flow?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Atomic Counters are diagnostic tools in Cisco ACI that allow tracking of specific flows through the fabric. Engineers can configure them to:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Monitor inter-EPG traffic<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Measure packet and byte counts<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Detect policy drops<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">This is particularly useful when traffic is expected but not reaching its destination. Atomic Counters reveal whether a policy is blocking traffic, where it\u2019s dropped, and what contract or filter may be causing the issue.<\/span><\/p>\r\n<h2><b>What is the significance of Contracts in troubleshooting inter-EPG communication?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Contracts define the communication permissions between Endpoint Groups. When endpoints within different EPGs cannot communicate:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">First check if a contract exists between them.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ensure the contract\u2019s subject and filters permit the required traffic.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Confirm the contract is correctly applied and not denied or shadowed by a more restrictive policy.<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">Understanding the contract structure is crucial for troubleshooting Layer 2\/3 communication within and across tenants.<\/span><\/p>\r\n<h2><b>How does Cisco ACI support Zero Trust architecture?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Cisco ACI supports Zero Trust principles by enforcing strict segmentation and verification policies:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">All inter-EPG traffic is denied by default unless explicitly allowed via contracts.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Micro-segmentation allows control down to the workload level.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Policies can reference attributes such as tags, VM properties, or security groups.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Integration with identity providers and firewalls adds user and application context.<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">This architecture minimizes attack surfaces and enforces least-privilege access across workloads.<\/span><\/p>\r\n<h2><b>How does Cisco ACI integrate with Kubernetes and container platforms?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Cisco ACI supports native integration with Kubernetes using the <\/span><b>ACI CNI (Container Network Interface)<\/b><span style=\"font-weight: 400;\"> plugin. This enables:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dynamic EPG assignment to pods<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Integration with Kubernetes namespaces and labels<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Policy-based communication between container workloads and traditional endpoints<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">ACI&#8217;s integration allows consistent policy enforcement across virtual machines, containers, and bare-metal servers. Engineers can define policies once and have them applied seamlessly across all platforms.<\/span><\/p>\r\n<h2><b>What are Bridge Domain forwarding options available in ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">ACI supports multiple forwarding behaviors within a Bridge Domain:<\/span><\/p>\r\n<ol>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Unicast Routing: Routes traffic across different subnets.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Flooding (for ARP or unknown unicast): Can be enabled or disabled per requirement.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Proxy ARP: Fabric replies on behalf of destination host to minimize flooding.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Subnet Check: Ensures source and destination endpoints are in the same subnet for Layer 2 forwarding.<\/span><\/li>\r\n<\/ol>\r\n<p><span style=\"font-weight: 400;\">Understanding these options is essential to ensure application connectivity while maintaining control over broadcast domains.<\/span><\/p>\r\n<h2><b>How does ACI handle broadcast, multicast, and unknown unicast traffic?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">ACI minimizes unnecessary traffic flooding by default but allows customization:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Broadcast: Limited using IGMP snooping and BD settings.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Multicast: Handled via PIM Sparse Mode for inter-subnet delivery.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Unknown Unicast: Suppressed using endpoint learning and forwarding tables.<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">These behaviors reduce noise, improve performance, and allow precise traffic control.<\/span><\/p>\r\n<h2><b>What is GOLF (Generic Overlay with Locator\/ID Separation Protocol)?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">GOLF is an ACI architecture extension that allows external routers (outside the fabric) to connect using LISP-based overlays, enabling ACI to serve as a controller without extending the entire fabric.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Use cases include:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Extending policies to legacy networks<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Integrating remote data centers<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Avoiding full mesh requirements of L3Outs<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">GOLF simplifies operations while maintaining policy-based connectivity.<\/span><\/p>\r\n<h2><b>What is the significance of EPG Static Binding vs. Dynamic Binding?<\/b><\/h2>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Static Binding: Maps an EPG to a specific physical port, VLAN, or interface. Often used for bare-metal servers or appliances.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dynamic Binding: Automatically assigns EPGs to workloads based on hypervisor integration, VM attributes, or labels.<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">Dynamic binding enhances automation and scalability, while static binding is essential for non-virtualized environments.<\/span><\/p>\r\n<h2><b>What are Shadow EPGs and when are they used?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Shadow EPGs are automatically created by the fabric when an EPG from one tenant is referenced in another tenant (e.g., through a contract or shared service).<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">They help maintain a representation of the original EPG\u2019s policy and attributes without duplicating its configuration. Shadow EPGs are crucial in multi-tenant deployments, especially for shared service models or provider-consumer designs.<\/span><\/p>\r\n<h2><b>How does Cisco ACI support Disaster Recovery and Business Continuity?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">ACI\u2019s Multi-Site and Stretched Fabric capabilities provide built-in support for:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Active\/active or active\/passive workloads<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Policy consistency across sites<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Seamless endpoint migration<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Inter-site contracts<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">Backup and restore functions within APIC also ensure configuration snapshots and recovery options. This enables organizations to recover quickly during outages or planned migrations.<\/span><\/p>\r\n<h2><b>What are the key considerations when designing a Cisco ACI fabric?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">When designing an ACI fabric, consider:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Scalability: Plan for leaf\/spine port density, endpoint counts, and APIC cluster capacity.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Application Requirements: Understand traffic flows, segmentation needs, and SLAs.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Security: Design contracts, filters, and micro-segmentation from day one.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">High Availability: Ensure redundant links, dual-homing, and backup power.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Integration Points: Consider VMware, Kubernetes, or L4-L7 service insertion early in the design.<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">Careful planning reduces the need for rework and ensures a smooth deployment lifecycle.<\/span><\/p>\r\n<h2><b>What tools are available for managing and automating Cisco ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Cisco ACI supports extensive programmability and automation via:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">REST APIs<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Python SDK<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ansible modules<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Terraform provider<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cisco ACI Toolkit<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">These tools allow integration with CI\/CD pipelines, Infrastructure-as-Code (IaC) workflows, and third-party orchestration platforms, enabling DevOps-friendly operations.<\/span><\/p>\r\n<h2><b>What is the role of Tenant, VRF, and Bridge Domain hierarchy in policy design?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">This hierarchy provides logical separation and policy inheritance:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tenant: Logical container for isolation; policies and objects reside here.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">VRF: Controls Layer 3 routing domains.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Bridge Domain: Manages Layer 2 communication.<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">Policies applied at the VRF or BD level propagate downward, allowing consistent enforcement and easier troubleshooting. A clear hierarchy helps simplify operational understanding and reduces policy conflicts.<\/span><\/p>\r\n<h2><b>What is the difference between Intra-EPG and Inter-EPG communication?<\/b><\/h2>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Intra-EPG: Endpoints in the same EPG can communicate without a contract.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Inter-EPG: Requires a defined contract to permit communication.<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">This model allows open access within trusted groups while enforcing strict control between separate application tiers or departments.<\/span><\/p>\r\n<h2><b>What is VMM Integration and how does it work?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Virtual Machine Manager (VMM) integration allows APIC to discover and interact with virtualization platforms like:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">VMware vCenter<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Microsoft SCVMM<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">OpenStack<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">With VMM integration, the APIC can:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Discover VMs and their network interfaces<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Automate EPG assignments<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Push port groups dynamically to virtual switches<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">This reduces manual steps and ensures consistent policy enforcement across hybrid infrastructures.<\/span><\/p>\r\n<h2><b>What are Preferred Groups in Cisco ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Preferred Groups are a feature that allows multiple EPGs to communicate freely within a security group without needing explicit contracts. They simplify policies in scenarios where:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Multiple applications or services require unrestricted communication<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Large groups of EPGs are tightly integrated<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">Preferred Groups reduce operational overhead while preserving segmentation.<\/span><\/p>\r\n<h2><b>How are policies applied to external networks in ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">External networks connect through <\/span><b>L3Outs<\/b><span style=\"font-weight: 400;\">. Policies applied here include:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Contracts<\/b><span style=\"font-weight: 400;\">: Define permitted traffic between internal and external EPGs.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Route Control<\/b><span style=\"font-weight: 400;\">: Redistribute internal routes to external peers and vice versa.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Filters<\/b><span style=\"font-weight: 400;\">: Limit exposed services or protocols.<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">ACI treats external connectivity as part of the policy model, ensuring consistency and visibility across internal and external traffic flows.<\/span><\/p>\r\n<h2><b>What is the difference between L2Out and L3Out in Cisco ACI?<\/b><\/h2>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">L2Out: Extends Layer 2 connectivity (e.g., for connecting to legacy switches or appliances in the same VLAN).<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">L3Out: Extends Layer 3 routing capabilities to external networks (e.g., for internet or WAN access).<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">Choosing between them depends on whether routing or bridging is required for the external connection.<\/span><\/p>\r\n<h2><b>How do you monitor endpoint movement in ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">ACI tracks endpoint movements automatically. The <\/span><b>Endpoint Tracker<\/b><span style=\"font-weight: 400;\"> tool in APIC shows:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">MAC\/IP bindings<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Leaf switch location<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Movement history<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Associated EPGs<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">This is particularly useful for troubleshooting dynamic workloads, such as VMs moving due to DRS or HA events.<\/span><\/p>\r\n<h2><b>How is role-based access control (RBAC) implemented in ACI?<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">RBAC in ACI defines what users or API clients can do within the system. Roles can be:<\/span><\/p>\r\n<ul>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Admin<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Fabric Administrator<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tenant Administrator<\/span><span style=\"font-weight: 400;\"><br \/>\r\n <br \/>\r\n <\/span><\/li>\r\n\t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Read-only<\/span><\/li>\r\n<\/ul>\r\n<p><span style=\"font-weight: 400;\">Custom roles can also be created to provide fine-grained permissions. This enhances operational security and ensures separation of duties.<\/span><\/p>\r\n<h2><b>Conclusion<\/b><\/h2>\r\n<p><span style=\"font-weight: 400;\">Cisco ACI is not just a next-generation networking solution\u2014it\u2019s a powerful platform for automation, segmentation, and policy control across physical, virtual, and cloud environments. As enterprise networks become increasingly complex, the ability to articulate, implement, and troubleshoot ACI-based solutions will become a crucial skill.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">From understanding the basics of EPGs and tenants to deploying service graphs and performing advanced troubleshooting with atomic counters, mastering Cisco ACI requires both conceptual clarity and hands-on experience. Preparing with real-world scenarios, architectural awareness, and policy design principles will significantly increase your success in ACI interviews and operational roles.<\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Cisco Application Centric Infrastructure (ACI) is a next-generation data center and cloud networking solution that brings a software-defined approach to traditional hardware-centric environments. By focusing on applications instead of individual devices, ACI enables organizations to accelerate operations, automate workflows, and implement scalable, policy-driven infrastructure. With ACI, network policies and services are defined centrally and applied uniformly across the entire fabric. This model delivers better control, operational simplicity, and adaptability to dynamic workload requirements. Core Components of Cisco ACI Cisco ACI is built around three key components that work in harmony:&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-4478","post","type-post","status-publish","format-standard","hentry","category-top-certifications"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cisco ACI Interview Questions and Answers: A Deep Dive into Architecture, Terminologies, and Core Concepts - Prepaway.net<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.prepaway.net\/certification-training\/cisco-aci-interview-questions-answers-deep-dive-architecture-terminologies-core-concepts\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cisco ACI Interview Questions and Answers: A Deep Dive into Architecture, Terminologies, and Core Concepts - Prepaway.net\" \/>\n<meta property=\"og:description\" content=\"Cisco Application Centric Infrastructure (ACI) is a next-generation data center and cloud networking solution that brings a software-defined approach to traditional hardware-centric environments. 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