A network administrator is configuring a new server so employees can upload and download files over an encrypted connection. The administrator decides to use the SSH File Transfer Protocol (SFTP). Which single TCP port must be opened on the firewall to allow SFTP traffic between clients and the server?
80
443
22
20 and 21
SFTP operates as a subsystem of SSH and, by default, uses TCP port 22 for both control commands and data transfer within a single encrypted session. Opening port 22 on the firewall is therefore sufficient to enable SFTP connectivity. Ports 20/21 are used by legacy (unencrypted) FTP, while ports 80 and 443 are associated with HTTP and HTTPS respectively and are unrelated to SFTP.
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