Cisco 300-630 Exam With Confidence Using Practice Dumps

The topology change notification (TCN) in Spanning Tree Protocol (STP) triggers a flush of the MAC address table. When a leaf node receives a TCN, it flushes the MAC address entries associated with the VLANs affected by the topology change. In this case, since the TCN is related to VLAN 101, the ACI fabric will flush all endpoints associated with VLAN 101 in bridge domain BD10123 on the leaf node.

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.

The L2 Stretch feature allows for the extension of a Layer 2 network across multiple sites without changing the IP addressing scheme, which satisfies the requirement for starting an application at a DR site without re-IPing servers. Disabling inter-site BUM (Broadcast, Unknown unicast, and Multicast) traffic prevents broadcast storms between sites while still allowing IP mobility, meeting both specified criteria. References := (Implementing Cisco Application Centric Infrastructure Official Cert Guide)