Which port is used for full synchronization between cluster members?

When it comes to full synchronization between cluster members in a Check Point environment, TCP port 256 plays a crucial role. This port is specifically designated for cluster control communication, which includes the synchronization of the state and configuration between the members of a cluster.

The use of TCP for this purpose is essential because TCP provides a reliable connection-oriented protocol, ensuring that all packets are delivered in order without losses, which is critical for maintaining the integrity of the synchronization process. Any loss of configuration data or state information during this synchronization could lead to inconsistencies within the cluster, potentially causing network security issues.

In contrast, the other options involving UDP do not apply here as UDP is a connectionless protocol that does not guarantee packet delivery or order, making it unsuitable for tasks that require reliable transmission, such as full synchronization in a security cluster. Hence, TCP port 256 is the correct and appropriate choice for ensuring effective and secure cluster member synchronization.