Which of the following ports would Zach, a technician, need to open on a firewall to allow SSH on the default port?

The correct answer is C. 22. SSH (Secure Shell) uses TCP port 22 by default. SSH provides encrypted remote terminal access, replacing the insecure Telnet protocol. Port 20 and 21 are used by FTP (data and control), and port 23 is used by Telnet.

Network security

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(47 responses)

A
6% (3)
B
2% (1)
C
89% (42)
D
2% (1)

Explanation

SSH (Secure Shell) uses TCP port 22 by default. SSH provides encrypted remote terminal access, replacing the insecure Telnet protocol. Port 20 and 21 are used by FTP (data and control), and port 23 is used by Telnet.

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#SSH#port numbers#firewall rules#protocol ports

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