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Difficulty: EasyNetworking Ports and Protocols

A technician is configuring firewall rules to permit automated bootstrap loading for thin client workstations via Trivial File Transfer Protocol (TFTP). Which of the following port and protocol combinations must be allowed through the firewall?

  1. UDP port 69Answer
  2. B
    TCP port 21
  3. C
    UDP port 53
  4. D
    TCP port 22

Answer

UDP port 69 is required for Trivial File Transfer Protocol (TFTP) operation.
Trivial File Transfer Protocol (TFTP) uses UDP port 69 to send small files like boot images without the overhead of establishing a TCP connection.

Step-by-Step Solution

1
Identify the requested network service
The scenario specifies Trivial File Transfer Protocol (TFTP), which is used for simple boot image loading.
Determining the protocol standard is the first step in matching port assignments.
2
Map TFTP to its default transport protocol and port number
TFTP operates over UDP on default port 69.
Unlike standard FTP (TCP 20/21) or SFTP (TCP 22), TFTP uses UDP port 69 because it does not require session-based overhead.

Key Concept

TFTP Port and Protocol Mapping
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Topics

Networking Ports and Protocols

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