Which of the following well-known TCP port numbers is used by the Secure Shell (SSH) protocol for establishing encrypted remote sessions?
22
20
23
21
The Secure Shell (SSH) protocol listens on TCP port 22 by default. Ports 20 and 21 are used by the File Transfer Protocol (FTP), while port 23 is reserved for Telnet, an unencrypted terminal protocol. Remembering these well-known port numbers is crucial for configuring firewalls and troubleshooting connectivity.
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