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

The correct answer is D. Some applications will recognize the loss and initiate a resend of the packet if necessary. UDP is a connection-less, “fire-and-forget” protocol with no acknowledgements or built-in retransmission. When reliable delivery is required, that logic must be implemented at the application layer.

Submitted by kim_seoul· Mar 6, 2026Networking Concepts

Question

Options

AThe data link layer will recognize the error and resend the packet.
BIP uses the TTL field to track packet hops and will resend the packet if necessary.
CIf the sender does not receive a UDP acknowledgement, the packet will be resent.
DSome applications will recognize the loss and initiate a resend of the packet if necessary.

How the community answered

(28 responses)

B
4% (1)
C
4% (1)
D
93% (26)

Explanation

UDP is a connection-less, “fire-and-forget” protocol with no acknowledgements or built-in retransmission. When reliable delivery is required, that logic must be implemented at the application layer.

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