220-802 · Question #473
Which of the following ports will have to be forwarded to allow an RDP connection to a specific machine?
The correct answer is C. 3389. RDP (Remote Desktop Protocol) uses a specific well-known port to accept inbound connections. Port 3389 must be forwarded on the router or firewall to reach the target machine.
Question
Which of the following ports will have to be forwarded to allow an RDP connection to a specific machine?
Options
- A25
- B110
- C3389
- D8080
How the community answered
(38 responses)- A5% (2)
- B3% (1)
- C89% (34)
- D3% (1)
Why each option
RDP (Remote Desktop Protocol) uses a specific well-known port to accept inbound connections. Port 3389 must be forwarded on the router or firewall to reach the target machine.
Port 25 is assigned to SMTP, used for sending email, not remote desktop connections.
Port 110 is assigned to POP3, used for retrieving email from a mail server.
Port 3389 is the default TCP/UDP port assigned to Remote Desktop Protocol (RDP). When a remote user initiates an RDP session, the connection attempt is directed to this port, so it must be opened or forwarded on any intervening firewall or NAT device to reach the internal host.
Port 8080 is a common alternate HTTP port used by web proxies and development servers, not RDP.
Concept tested: RDP default port number identification
Source: https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/clients/remote-desktop-allow-access
Topics
Community Discussion
No community discussion yet for this question.