You are connecting from a Windows desktop PC to a remote server. The connection allows you to control the server's mouse, keyboard and you can see the desktop and any open windows of the server. What port number is used by the protocol being used?
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Answer Description
Remote Desktop Protocol (RDP) is a Windows application and protocol to allow remote access to Windows devices. It uses port 3389 by default.
Wikipedia
Remote Desktop Protocol (RDP) is a proprietary protocol developed by Microsoft Corporation which provides a user with a graphical interface to connect to another computer over a network connection. The user employs RDP client software for this purpose, while the other computer must run RDP server software.
Clients exist for most versions of Microsoft Windows (including Windows Mobile but the support has ended), Linux (for example Remmina), Unix, macOS, iOS, Android, and other operating systems. RDP servers are built into the server and professional editions of Windows operating systems but not home editions; an RDP server for Unix and OS X also exists (for example xrdp). By default, the server listens on TCP port 3389 and UDP port 3389.Microsoft currently refers to their official RDP client software as Remote Desktop Connection, formerly "Terminal Services Client".
The protocol is an extension of the ITU-T T.128 application sharing protocol. Microsoft makes some specifications public on their website.
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