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Difficulty: MediumCommon Ports and Protocols

A systems administrator is configuring firewall ACL rules to segregate an administrative workstation network from a management server rack. The configuration policy requires permitting remote graphical desktop administration for Windows servers and allowing network infrastructure devices to forward unencrypted system log entries to a central log collector server. Which TWO of the following port and transport protocol combinations must be allowed in the firewall rule base?

  1. TCP port 3389Answer
  2. UDP port 514Answer
  3. C
    UDP port 3389
  4. D
    TCP port 514

Answer

TCP port 3389 and UDP port 514 must be permitted.
The scenario calls for two distinct services: Windows graphical remote desktop management and unencrypted event log collection. Remote Desktop Protocol (RDP) establishes connection-oriented management sessions on TCP port 3389. Standard Syslog event logging transmits unencrypted log entries over UDP port 514. Therefore, allowing TCP port 3389 and UDP port 514 satisfies both operational requirements.

Step-by-Step Solution

1
Identify the required network service protocols from the administrative scenario requirements.
Graphical desktop administration for Windows servers requires Remote Desktop Protocol (RDP). Unencrypted system log entry forwarding requires standard Syslog.
Mapping enterprise management functions to their standard network service protocols is necessary for firewall rule design.
2
Determine the transport layer protocol and default destination port for Remote Desktop Protocol (RDP).
RDP uses TCP port 3389.
RDP requires a reliable connection-oriented transport protocol (TCP) to manage interactive desktop display updates and keyboard/mouse inputs without packet loss.
3
Determine the transport layer protocol and default destination port for standard unencrypted Syslog.
Standard Syslog uses UDP port 514.
Native Syslog is designed as a low-overhead, connectionless log-reporting protocol that transmits event notifications over UDP.

Key Concept

Standard Port Numbers and Transport Layer Protocol Pairings
Estimated Time:1m 30s
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Topics

Common Ports and Protocols

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