CCNP Data Center 300-630 Updated Exam

 In Cisco ACI, contracts define the policies for communication between EPGs (Endpoint Groups). For a client in WebClient EPG to establish an HTTP connection toward a server in WebServer EPG, the contract must allow the initiation of communication from WebClientto WebServer. Since HTTP uses port 80, the destination port (DST Port) should be set to 80 as per standard HTTP communications. The option “Apply Both Direction DISABLED” means that only the initiator of the connection (in this case, WebClient EPG) can send traffic unless specified otherwise by another contract or filter. The “Reverse Port Filter ENABLED” allows return traffic from WebServer EPG back to WebClient EPG on dynamically allocated source ports used by WebClient when initiating the connection. This combination ensures that clients can initiate an HTTP request and receive responses from servers. References: = Implementing Cisco Application Centric Infrastructure Official Cert Guide

To connect two nonsilient servers in active/standby mode to two ACI leaves, you should implement a virtual PortChannel (vPC) on the ACI leaves. vPC provides high availability and load balancing for server connections.

References := Cisco APIC Layer 2 Networking Configuration Guide, Release 5.2(x)

 In a stretched bridge domain solution between Cisco ACI sites with Layer 2 flood disabled, headend replication is used for broadcast, unknown unicast, and multicast (BUM) traffic between sites. This approach optimizes traffic flow and reduces unnecessary flooding across the network1.

References := Implementing Cisco Application Centric Infrastructure Official Cert Guide

PBR Node Tracking:

Purpose: It is used to monitor the health and availability of endpoints within an Endpoint Group (EPG).

Functionality: When configured, it allows for real-time health checks and traffic redirection based on endpoint status and network conditions.

Benefits: Ensures traffic is directed to healthy endpoints, maintaining application performance and availability.