Host A (on a TCP/IPv4 network) sends an IP datagram D to host B (also on a TCP/IPv4 network). Assume no error occurred during transmission of D. When D reaches B, which of the following header fields may differ from those of the original datagram D?
(A) TTL
(B) Checksum
(C) Fragment offset
(D) Source IP
(E) Destination IP
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Correct answer: B. (A), (B) and (C) Only
Explanation
Each router decrements TTL and therefore recomputes the header checksum. If the datagram is fragmented on the way, the fragment offset changes. Source and destination addresses stay the same (ignoring NAT).More Data Communication and Computer Networks questions
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