Which application protocol supports secure tunneling, remote terminal emulation, and file copy and runs over TCP port 22?

Which application protocol supports secure tunneling, remote terminal emulation, and file copy and runs over TCP port 22?

• A. Hypertext Transfer Protocol (HTTP)
• B. File Transfer Protocol (FTP)
• C. Simple Mail Transfer Protocol (SMTP)
• D. Secure Shell (SSH)

Answer: (D)

This question is about which protocol provides a secure, encrypted channel that supports remote command execution, secure file transfer, and the ability to forward other connections. Secure Shell, or SSH, fits all of these capabilities. It creates an encrypted connection over TCP port 22, allowing you to log into a remote system and run commands in a terminal session (remote terminal emulation). It also enables secure file copy and transfer via SCP or SFTP, which run over the same SSH channel. Additionally, SSH can tunnel other connections through port forwarding, effectively creating secure tunnels for other services. The other protocols don’t combine these functions: HTTP is for web traffic, FTP is for file transfer without a secure default channel, and SMTP is for email transfer.

This question is about which protocol provides a secure, encrypted channel that supports remote command execution, secure file transfer, and the ability to forward other connections. Secure Shell, or SSH, fits all of these capabilities. It creates an encrypted connection over TCP port 22, allowing you to log into a remote system and run commands in a terminal session (remote terminal emulation). It also enables secure file copy and transfer via SCP or SFTP, which run over the same SSH channel. Additionally, SSH can tunnel other connections through port forwarding, effectively creating secure tunnels for other services. The other protocols don’t combine these functions: HTTP is for web traffic, FTP is for file transfer without a secure default channel, and SMTP is for email transfer.