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Previous Year Question (PYQs)

Host A (on TCP/IPv4 Networks) send an IP Datagram D to host B (also on TCP/IPv4 network). Assume that no error occurred during transmission of D, when D reaches host B. Which of following header field may differ from that of original datagram D ?


(A) TTL

(B) Checksum

(C) Fragment offset

(D) Source IP

(E) Destination IP


Choose the correct answer from the options given below :





Solution

(A) TTL → Decreases at every router ✔


(B) Header checksum → Recomputed whenever TTL changes ✔


(C) Fragment offset → May change if fragmentation occurs ✔


(D) Source IP → Does not change ✘


(E) Destination IP → Does not change ✘


Thus fields that may differ:


TTL, Checksum, Fragment offset


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