Sun RPC Endpoint Mapper uses which port?

Sun RPC Endpoint Mapper uses which port?

• A. 514
• B. 111
• C. 23
• D. 520

Answer: (B)

The Endpoint Mapper (rpcbind) is the discovery service for Sun RPC that tells clients which port a given RPC service is listening on. It runs on port 111, and a client first queries this port to obtain the specific port for the desired RPC program and version, then connects to that port to use the service. This is why port 111 is the correct choice. The other ports correspond to unrelated services—514 for syslog, 23 for Telnet, and 520 for RIP—not to the Endpoint Mapper.

The Endpoint Mapper (rpcbind) is the discovery service for Sun RPC that tells clients which port a given RPC service is listening on. It runs on port 111, and a client first queries this port to obtain the specific port for the desired RPC program and version, then connects to that port to use the service. This is why port 111 is the correct choice. The other ports correspond to unrelated services—514 for syslog, 23 for Telnet, and 520 for RIP—not to the Endpoint Mapper.