Question:
What mechanism does TCP use to ensure reliable data delivery?
What mechanism does TCP use to ensure reliable data delivery?
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How does a TCP sender learn a segment was lost, and what does it do next?
Updated On: Jul 2, 2026
- Acknowledgments and retransmissions
- Packet flooding
- Checksums only
- Best-effort delivery
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The Correct Option is A
Solution and Explanation
Step 1: TCP is a connection-oriented, reliable transport protocol. Reliability means lost or corrupted data must be recovered.
Step 2: The receiver returns acknowledgments (ACKs) for data it gets. If the sender does not receive an ACK before its timer expires, it retransmits the segment. This ACK-plus-retransmission loop is the core reliability mechanism.
Step 3: Reject the others. Packet flooding is not a TCP delivery method. Checksums alone only detect errors, they do not recover lost data. Best-effort delivery describes UDP and IP, which give no guarantees.
Step 4: The correct answer is Acknowledgments and retransmissions.
Step 2: The receiver returns acknowledgments (ACKs) for data it gets. If the sender does not receive an ACK before its timer expires, it retransmits the segment. This ACK-plus-retransmission loop is the core reliability mechanism.
Step 3: Reject the others. Packet flooding is not a TCP delivery method. Checksums alone only detect errors, they do not recover lost data. Best-effort delivery describes UDP and IP, which give no guarantees.
Step 4: The correct answer is Acknowledgments and retransmissions.
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