SY0-301 · Question #222
Which of the following is the default port for TFTP?
The correct answer is B. 69. TFTP (Trivial File Transfer Protocol) uses UDP port 69 for transferring files without authentication. This is a well-known port assignment tested on virtually every networking and security certification.
Question
Which of the following is the default port for TFTP?
Options
- A20
- B69
- C21
- D68
How the community answered
(50 responses)- A4% (2)
- B92% (46)
- C2% (1)
- D2% (1)
Why each option
TFTP (Trivial File Transfer Protocol) uses UDP port 69 for transferring files without authentication. This is a well-known port assignment tested on virtually every networking and security certification.
Port 20 is the FTP data transfer channel, used by the File Transfer Protocol for sending file content after a control connection is established on port 21.
TFTP is assigned UDP port 69 by IANA and is commonly used for transferring configuration files to network devices such as routers and switches. Because it uses UDP and has no authentication, it is considered an insecure protocol and is often blocked on perimeter firewalls.
Port 21 is the FTP control port, used to establish FTP sessions and send commands such as USER, PASS, and RETR.
Port 68 is used by DHCP clients to receive address assignment messages from a DHCP server, and is unrelated to file transfer protocols.
Concept tested: Well-known port number for TFTP
Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
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