A network technician needs to configure a firewall to allow secure remote administration of a Linux server. Which TCP port should the technician open to allow Secure Shell (SSH) access?
23
22
443
3389
Secure Shell (SSH) uses TCP port 22 for secure remote command-line access. Port 23 is used by Telnet, an insecure remote access protocol. Port 443 is used for HTTPS, which secures web traffic. Port 3389 is used by the Remote Desktop Protocol (RDP) for remote graphical access, primarily on Windows systems. For secure command-line administration as specified, port 22 is the correct choice.
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