CompTIA Network+ (N10-009) — Question 359

Which of the following explains what happens if a packet is lost in transit when using UDP?

Answer options

• A. The data link layer will recognize the error and resend the packet.
• B. IP uses the TTL field to track packet hops and will resend the packet if necessary.
• C. If the sender does not receive a UDP acknowledgement, the packet will be resent.
• D. Some applications will recognize the loss and initiate a resend of the packet if necessary.

Correct answer: D

Explanation

The correct answer is D because some applications are designed to handle packet loss and can request a resend. Options A and B are incorrect as they describe mechanisms that do not apply to UDP, which does not guarantee delivery or retransmission. Option C is also wrong since UDP does not use acknowledgments for retransmission.