What's RDP (Remote Desktop Protocol)

Microsoft Remote Desktop Protocol is a multi-channel protocol that allows a user to connect to a computer running Microsoft Terminal Services.When working with Terminal Servers, the term "RDP" will come up frequently. As mentioned previously, RDP is a protocol that runs on TCP/IP (much like SMTP, HTTP, etc.).

The Remote Desktop Protocol (RDP) is the network protocol used by Terminal Service client devices for client-to-server session communication. The RDP protocol actually transmits keystrokes and mouse movements from the client to the server, and screen images from the server to the client. This protocol is also responsible for connecting client resources, such as mapping a user's clipboard, local drives, and local ports, as well as printing and encryption.

The RDP protocol is a high-level TCP/IP protocol that can run over port 3389 (per default, although you can change this port). It is the only server-based computing protocol that Terminal Server supports out of the box, although various third-party products use their own protocols rather than RDP.

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