GCIA · Question #112
Which of the following protocols is used by TFTP as a file transfer protocol?
The correct answer is A. UDP. TFTP (Trivial File Transfer Protocol) uses UDP as its transport protocol, relying on its own simple acknowledgment mechanism rather than TCP's built-in reliability.
Question
Which of the following protocols is used by TFTP as a file transfer protocol?
Options
- AUDP
- BSNMP
- CTCP
- DSMTP
How the community answered
(23 responses)- A83% (19)
- B4% (1)
- C9% (2)
- D4% (1)
Why each option
TFTP (Trivial File Transfer Protocol) uses UDP as its transport protocol, relying on its own simple acknowledgment mechanism rather than TCP's built-in reliability.
TFTP is defined in RFC 1350 and operates over UDP port 69. Because UDP is connectionless and provides no guaranteed delivery, TFTP implements its own lightweight stop-and-wait acknowledgment scheme to confirm each data block, keeping the protocol simple for use cases like network booting (PXE) and router IOS image transfers.
SNMP is a network management protocol used to monitor and manage devices, not a transport-layer protocol.
TCP is used by FTP (ports 20/21) for reliable file transfers, not by TFTP, which deliberately avoids TCP's overhead.
SMTP is an application-layer protocol for sending email and has no involvement in file transfer operations.
Concept tested: TFTP transport protocol and UDP port
Source: https://datatracker.ietf.org/doc/html/rfc1350
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