Heartbeats are used to maintain the high-availability status of an application. Which factor is most important? 

Answer options:

A. routing
B. bandwidth
C. round-trip time
D. latency

C

Link latency monitors the round-trip time of the CAPWAP heartbeat packets (echo request and response) from the access point to the controller and back. This time can vary due to the network link speed and controller processing loads. The access point timestamps the outgoing echo requests to the controller and the echo responses received from the controller. The accesspoint sends this delta time to the controller as the system round-trip time. The access point sends heartbeat packets to the controller at a default interval of 30 seconds.