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Difficulty: MediumCommon Ports and Protocols

A network administrator is configuring a firewall rule to allow secure remote graphical management from an internal administrative jump host to a pool of Windows application servers. To enforce the principle of least privilege, the firewall policy should strictly limit access to the standard Remote Desktop Protocol (RDP). Which transport protocol and destination port combination must be permitted in the firewall policy?

  1. TCP port 3389Answer
  2. B
    TCP port 22
  3. C
    UDP port 3389
  4. D
    TCP port 23

Answer

TCP port 3389 is the standard transport protocol and destination port used for Remote Desktop Protocol (RDP) traffic.
Remote Desktop Protocol (RDP) uses TCP port 3389 by default to establish reliable, connection-oriented virtual graphical desktop sessions between a client and a remote server.

Step-by-Step Solution

1
Identify the service and management protocol requested in the scenario.
The requirement specifies standard Remote Desktop Protocol (RDP) for graphical server administration.
Different remote administration services use distinct transport layer protocols and default well-known ports.
2
Determine the transport layer protocol and default well-known port number for RDP.
RDP natively uses TCP as its primary transport protocol and listends on default port 3389.
Connection-oriented delivery guaranteed by TCP is required for control and screen rendering reliability.
3
Match the identified protocol and port to the corresponding firewall rule option.
Configuring a firewall rule permitting TCP port 3389 satisfies the least privilege requirement for RDP traffic.
Permitting TCP 3389 opens only the strictly required path for RDP management sessions.

Key Concept

Common Ports and Protocols: Remote Desktop Protocol (RDP)
Estimated Time:1m 0s
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Topics

Common Ports and Protocols

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