220-802 Question #280: Real Exam Question with Answer & Explanation

The correct answer is C: 3389. Remote Desktop Protocol (RDP) uses TCP port 3389 by default. For Remote Desktop connections to reach a Windows workstation through a firewall or router, port 3389 must be open and allowed. Port 53 (A) is used by DNS for domain name resolution. Port 80 (B) is used by HTTP for stan

Question

Which of the following ports MUST be open in order for Remote Desktop to function?

Options

A53
B80
C3389
D5900

Explanation

Remote Desktop Protocol (RDP) uses TCP port 3389 by default. For Remote Desktop connections to reach a Windows workstation through a firewall or router, port 3389 must be open and allowed. Port 53 (A) is used by DNS for domain name resolution. Port 80 (B) is used by HTTP for standard web traffic. Port 5900 (D) is used by VNC (Virtual Network Computing), which is a separate remote desktop technology. Memorizing well-known port numbers is a fundamental networking skill tested across multiple CompTIA certification exams, including A+, Network+, and Security+.

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