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Host A(on TCP/IP v4 network A) sends an IP datagram D to host B (also on TCP/IP v4 network B) Assume that no error occurred during the transmission of D. When D reaches B, which of the following IP header field(s) may be different from that of the original datagram D?

i) TTL    ii) Checksum     iii) Fragment Offset


1. (i) only
2. (i) and (ii) only
3. (ii) and (iii) only
4. (i), (ii) and (iii)

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Correct Answer - Option 4 : (i), (ii) and (iii)
  • TTL will change after each hop so checksum will also change.
  • Since MTU of the router is different therefore datagram may be different and hence fragment offset is different for different packets.

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