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Difficulty: EasyTFTP and FTP Operations for System Images and Configuration Management

A network administrator is transferring a Cisco IOS software image from a router to a central backup server using Trivial File Transfer Protocol (TFTP). Which transport-layer protocol and default destination port are used by TFTP for this operation?

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

Answer

TFTP uses UDP as its transport-layer protocol and listens on default destination port 69.
Trivial File Transfer Protocol (TFTP) is designed to operate over UDP using destination port 69 for basic, low-overhead file management operations.

Step-by-Step Solution

1
Identify the file transfer protocol specified in the question.
The scenario specifies Trivial File Transfer Protocol (TFTP).
Distinguishing between TFTP and standard FTP determines the underlying transport protocol and port number.
2
Determine the transport-layer protocol used by TFTP.
TFTP operates over UDP (User Datagram Protocol).
TFTP uses UDP to avoid the connection establishment overhead of TCP, implementing simple error recovery at the application layer.
3
Identify the standard well-known port number for TFTP.
TFTP uses port 69 as its standard UDP server port.
Port 69 is assigned by IANA for TFTP daemon communication.

Key Concept

TFTP Transport Layer Mechanics and Port Numbers
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Topics

TFTP and FTP Operations for System Images and Configuration Management

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