Which port is used for the HA heartbeat UDP communication?

Which port is used for the HA heartbeat UDP communication?

• A. 3010
• B. 3003
• C. 22
• D. 3008

Answer: (B)

The HA heartbeat uses a dedicated UDP channel between high-availability peers to quickly confirm each node is alive. The port assigned for that UDP heartbeat is 3003. This lets the cluster send lightweight, fast status signals without mixing with other management traffic, so failover decisions can be made promptly when a node stops replying. If 3003 is blocked, the cluster can’t reliably detect a failed node, delaying failover. The other numbers refer to different services—SSH uses 22, and 3010 and 3008 are not used for the heartbeat—so they aren’t the correct port for the HA heartbeat.

The HA heartbeat uses a dedicated UDP channel between high-availability peers to quickly confirm each node is alive. The port assigned for that UDP heartbeat is 3003. This lets the cluster send lightweight, fast status signals without mixing with other management traffic, so failover decisions can be made promptly when a node stops replying. If 3003 is blocked, the cluster can’t reliably detect a failed node, delaying failover. The other numbers refer to different services—SSH uses 22, and 3010 and 3008 are not used for the heartbeat—so they aren’t the correct port for the HA heartbeat.