GCIA Question #87: Real Exam Question with Answer & Explanation

The correct answer is A. TFTP uses a UDP port for communication. B. UDP is an unreliable protocol. E. UDP is a connectionless protocol.. UDP is a connectionless, unreliable transport-layer protocol used by TFTP and other applications that prioritize speed over guaranteed delivery.

Question

Which of the following statements are true about UDP? Each correct answer represents a complete solution. Choose all that apply.

Options

ATFTP uses a UDP port for communication.
BUDP is an unreliable protocol.
CFTP uses a UDP port for communication.
DUDP works at the data-link layer of the OSI model.
EUDP is a connectionless protocol.

Explanation

UDP is a connectionless, unreliable transport-layer protocol used by TFTP and other applications that prioritize speed over guaranteed delivery.

Common mistakes.

C. FTP uses TCP on ports 20 (data) and 21 (control) because it requires reliable, ordered, and error-checked delivery of file data.
D. UDP operates at the Transport layer (Layer 4) of the OSI model, not the Data-Link layer (Layer 2), which handles framing and MAC addressing.

Concept tested. UDP characteristics and transport-layer protocol usage

Reference. https://www.rfc-editor.org/rfc/rfc768

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