What port in TCP/IP communication is utilized for Kerberos v5?

Kerberos v5 uses TCP and UDP port 88 for its communication. This port is specifically designated for the Kerberos authentication protocol, which is designed to allow entities to securely prove their identity over a non-secure network. When a client needs to authenticate to a service, it interacts with the Kerberos Key Distribution Center (KDC), which operates over this designated port. This is a crucial aspect of the Kerberos system, as proper communication through the designated port is necessary for the authentication tickets to be exchanged appropriately.

The selection of port 88 is standardized within the Internet Assigned Numbers Authority (IANA) service name and port number registry, making it an essential part of setting up and troubleshooting Kerberos implementations in mixed environments. Proper knowledge of this port is vital for network administrators who work with mixed environments that leverage Kerberos for secure authentication.