Exam 300-620 topic 1 question 300 discussion

its 3.

In Cisco ACI, host tracking is a mechanism used to ensure that local endpoints (e.g., hosts or VMs) remain active in the fabric's endpoint table. If no traffic is received from a local endpoint during a certain period (75% of the aging interval), the ACI leaf switch performs host tracking by sending three ARP requests to verify the endpoint's presence. https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-739989.html

For local endpoints that have IP addresses associated with them, leaf switches perform Host Tracking at 75 percent of the aging interval if no packets from the same IP address was received during the interval. Host Tracking is always enabled and will send three ARP requests to the IP address in order to make sure that the IP address is still responsive.

Cisco ACI uses silent host detection to monitor endpoints that do not generate traffic. The ACI leaf switch sends a single ARP Glean request to detect and track local endpoints. This mechanism is efficient and avoids unnecessary flooding in the network.

In a network with host tracking capabilities (such as in Cisco ACI environments), leaf switches send 1 ARP request to track each local endpoint. This single ARP request is used to determine the MAC and IP information for the local endpoint, which helps maintain accurate endpoint information in the network's host tracking tables.

I will go with A