TestOut LabSim A+ Certification 2026 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 690

Which port needs to be opened in the firewall to allow remote clients to access a Windows workstation's Remote Desktop?

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The correct answer is 3389 because this is the default port used by the Remote Desktop Protocol (RDP) for remote access to Windows workstations. When clients attempt to connect remotely to a Windows machine, they communicate over this specific port. If the firewall blocking rules do not allow traffic on port 3389, remote connections will be unsuccessful because the crucial communication necessary for initiating a remote desktop session cannot occur.

The other options are associated with different services: port 80 is used for HTTP traffic, port 25 is designated for SMTP (Simple Mail Transfer Protocol) used for email transmission, and port 443 is used for HTTPS, which is HTTP traffic transmitted over a secure connection. Understanding these specific functions helps clarify why opening port 3389 is vital for enabling Remote Desktop access.

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