SK0-004 · Question #393
A systems administrator receives an email indicating a Windows user in finance cannot access the finance server remotely but is currently logged onto the network. Which of the following ports should…
The correct answer is C. RDP (3389). Remote Desktop Protocol (RDP) uses TCP port 3389, which must be open and listening for remote Windows access to function.
Question
A systems administrator receives an email indicating a Windows user in finance cannot access the finance server remotely but is currently logged onto the network. Which of the following ports should be checked to determine if it is listening or open?
Options
- AFTP (20/21)
- BDNS (53)
- CRDP (3389)
- DRDP (3893)
How the community answered
(27 responses)- A4% (1)
- B4% (1)
- C85% (23)
- D7% (2)
Why each option
Remote Desktop Protocol (RDP) uses TCP port 3389, which must be open and listening for remote Windows access to function.
FTP ports 20 and 21 are used for file transfer, not remote desktop sessions, so they are irrelevant to this remote access issue.
DNS port 53 handles name resolution; while a DNS failure could cause connection issues by name, the question context points to a remote access protocol problem, not name resolution.
RDP operates on TCP port 3389 by default and is the protocol used for remote graphical access to Windows servers. If this port is not listening or is blocked by a firewall, remote desktop connections will fail even though the user is authenticated on the network. Verifying port 3389 is open is the correct first diagnostic step for a remote access failure.
Port 3893 is not a valid or standard RDP port; the correct and standardized RDP port is 3389.
Concept tested: RDP port 3389 for remote Windows server access
Source: https://learn.microsoft.com/en-us/troubleshoot/windows-server/remote/understanding-remote-desktop-protocol
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