Computer Sciences > GATE 2025 SET-2 > Network Protocols
Consider the following statements:
(i) Address Resolution Protocol (ARP) provides a mapping from an IP address to the corresponding hardware (link-layer) address.
(ii) A single TCP segment from a sender S to a receiver R cannot carry both data from S to R and acknowledgement for a segment from R to S.
Which ONE of the following is CORRECT?
(i) Address Resolution Protocol (ARP) provides a mapping from an IP address to the corresponding hardware (link-layer) address.
(ii) A single TCP segment from a sender S to a receiver R cannot carry both data from S to R and acknowledgement for a segment from R to S.
Which ONE of the following is CORRECT?
Correct : b
Address Resolution Protocol (ARP) does provide a mapping from an IP address to the corresponding hardware (link-layer) address, so statement (i) is TRUE.
Statement (ii) is FALSE. A single TCP segment can carry both data from the sender to the receiver and an acknowledgement for a segment that was sent from the receiver to the sender in the same segment. This is called "piggybacking" and is common in bidirectional TCP communication. So, it is not true that a single segment cannot carry both data and acknowledgement.
✅ Final Answer: Option (b) — (i) is TRUE and (ii) is FALSE.
Reason: ARP maps IP addresses to hardware addresses. TCP allows sending data and acknowledgement together, so statement (ii) is incorrect.
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