Discussion
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?
Answer: B
(i) is TRUE and (ii) is FALSE.
(i) ARP takes an IP address on the local network and returns the corresponding link-layer (MAC) address, by broadcasting a request and receiving a unicast reply. That is exactly the mapping described.
(ii) TCP is full duplex, and every segment carries an acknowledgement number field. A segment from S to R can carry data for R and, with the ACK flag set, acknowledge data received from R at the same time. This is piggybacking, and it is the normal case in a two-way exchange. So (ii) is false.
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