What does TCP port 22 correspond to?

TCP port 22 is designated for Secure Shell (SSH), which is a protocol used to securely access and manage network devices and servers over an unsecured network. SSH provides a secure channel for communication, encrypting the data transmitted between the client and server to prevent eavesdropping, tampering, and other types of attacks. This makes it essential for remote administration and file transfers in a secure manner.

When devices communicate using SSH, they rely on this specific port to establish the connection, ensuring that only authorized users can access the systems. The use of encryption adds a layer of security that is crucial in today’s network landscape, where threats are prevalent.

The other options correspond to different protocols entirely. HTTP is associated with port 80, FTP uses port 21, and DNS typically operates on port 53. Each of these protocols has distinct functions and operates over different ports, highlighting the importance of proper port management in network security.