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Question

Difficulty: MediumCommon Ports and Protocols

A system engineer is updating perimeter firewall rules to allow local network devices to retrieve operating system installation images from a Trivial File Transfer Protocol (TFTP) provisioning server. Which transport protocol and port combination must be permitted inbound on the server?

  1. UDP port 69Answer
  2. B
    TCP port 21
  3. C
    TCP port 22
  4. D
    UDP port 67

Answer

UDP port 69
Trivial File Transfer Protocol (TFTP) operates on UDP port 69. It provides low-overhead, connectionless file transfer suitable for devices requesting firmware or PXE network boot images.

Step-by-Step Solution

1
Identify the protocol specified for retrieving boot images.
The scenario identifies Trivial File Transfer Protocol (TFTP).
TFTP is specifically designed for simple, unauthenticated file downloads during network bootstrapping.
2
Determine the transport protocol and standard service port for TFTP.
TFTP listens on UDP port 69.
Because TFTP relies on UDP rather than TCP, inbound requests must be permitted on UDP destination port 69.

Key Concept

Trivial File Transfer Protocol (TFTP) port and transport protocol assignment
Estimated Time:1m 0s
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Topics

Common Ports and Protocols

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