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Difficulty: EasyCommon Ports and Protocols

A network administrator needs to update access control list rules to permit network file transfer services. Which of the following default transport protocols and port numbers are correctly matched with their protocol? (Select TWO.)

  1. TFTP using UDP port 69Answer
  2. SFTP using TCP port 22Answer
  3. C
    FTP using UDP port 21
  4. D
    HTTPS using TCP port 80

Answer

The correct choices are 'TFTP using UDP port 69' and 'SFTP using TCP port 22'.
Trivial File Transfer Protocol (TFTP) operates on UDP port 69 to perform unauthenticated, low-overhead file transfers. Secure File Transfer Protocol (SFTP) operates over SSH, which uses TCP port 22 to encrypt authentication and data transfer.

Step-by-Step Solution

1
Identify the transport protocol and default port for TFTP.
Trivial File Transfer Protocol (TFTP) uses UDP at port 69.
TFTP relies on connectionless UDP to minimize protocol overhead during simple file transfers.
2
Identify the transport protocol and default port for SFTP.
Secure File Transfer Protocol (SFTP) uses TCP at port 22.
SFTP runs inside an SSH tunnel, inheriting SSH's reliance on TCP port 22.
3
Evaluate the remaining options.
FTP uses TCP (not UDP), and HTTPS uses port 443 (not port 80).
Standard FTP requires reliable TCP state management, and HTTPS defaults to port 443.

Key Concept

Common Network Ports and Transport Protocols for File Transfer
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Topics

Common Ports and Protocols

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