Which of the following ports should a network administrator enable for encrypted login to a...

Port 22 is used for Secure Shell (SSH), which enables encrypted remote login and command execution on network devices.

Port 23 = Telnet (unencrypted)

Port 80 = HTTP

Port 123 = NTP

From Andrew Ramdayal’s guide:

“SSH uses port 22 to provide secure command-line access to devices such as switches and routers. Unlike Telnet (port 23), SSH encrypts session traffic, making it the preferred method for remote administration.”