Which port is used by the rsh service?

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Prepare for the CPSA Port Numbers exam with multiple choice questions and detailed explanations. Understand key protocols and services to excel in your test.

Multiple Choice

Which port is used by the rsh service?

Explanation:
Remote services are linked to well-known port numbers, so a daemon offering a specific service listens on its assigned port. The rsh (remote shell) service is tied to port 514, meaning clients connect to that port to run commands on a remote machine. The other numbers correspond to different services: 88 is used by Kerberos authentication, 3389 is for Remote Desktop Protocol, and 2049 is used by NFS. Since rsh is an older, unencrypted protocol, many systems disable it or use SSH (port 22) for remote command execution.

Remote services are linked to well-known port numbers, so a daemon offering a specific service listens on its assigned port. The rsh (remote shell) service is tied to port 514, meaning clients connect to that port to run commands on a remote machine. The other numbers correspond to different services: 88 is used by Kerberos authentication, 3389 is for Remote Desktop Protocol, and 2049 is used by NFS. Since rsh is an older, unencrypted protocol, many systems disable it or use SSH (port 22) for remote command execution.

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