What port is used by the Remote Desktop Protocol (RDP)?

The Remote Desktop Protocol (RDP) uses port 3389 for network communications. This is the standard port designated for RDP, which enables users to connect to and control remote computers running Windows. When a user initiates a remote desktop session, the client application communicates specifically through this port to establish a connection with the remote system's RDP service.

Port 80 is typically used for HTTP traffic, while port 443 is used for HTTPS, which is secure HTTP. Port 22 is associated with SSH (Secure Shell) used for secure command-line interface access to remote systems. Thus, each of these ports serves specific functions within the realm of network communications, but only port 3389 is designated for the operation of RDP, making it the correct choice in this context.