Which of the following protocols runs on port 22 and protects the authenticity and confidentiality of the data in transit?

Which of the following protocols runs on port 22 and protects the authenticity and confidentiality of the data in transit?

• FTP
• SSL
• SCP
• DHCP 

EXPLANATION

The SCP is a network protocol, based on the BSD RCP protocol,^[4] which supports file transfers between hosts on a network. SCP uses Secure Shell (SSH) for data transfer and uses the same mechanisms for authentication, thereby ensuring the authenticity and confidentiality of the data in transit. A client can send (upload) files to a server, optionally including their basic attributes (permissions, timestamps). Clients can also request files or directories from a server (download). SCP runs over TCP port 22 by default. Like RCP, there is no RFC that defines the specifics of the protocol.