Which port is required for remote administration of a server?

The port required for remote administration of a server, particularly for Windows environments, is TCP 3389. This port is utilized by the Remote Desktop Protocol (RDP), which allows users to connect to another computer over a network connection and manage it as if they were physically present at the machine. RDP provides a graphical interface to the user and is widely used for remote server management.

Understanding the context of this choice highlights its significance in server administration workflows. RDP is commonly leveraged by system administrators for troubleshooting, configuration, and maintenance tasks, making TCP 3389 a crucial port in scenarios where remote management capability is necessary.

In contrast, TCP 25 is typically associated with SMTP (Simple Mail Transfer Protocol) for email transmission; TCP 389 is used for LDAP (Lightweight Directory Access Protocol), which is essential for directory services; and TCP 3128 is often used for proxy servers. While these ports serve important functions in networking and server management, they do not pertain directly to the remote administration of servers like TCP 3389 does.