GATE 2015 CS (CS2) – Question 37

Computer Networks · IPv4: Addressing, CIDR, Fragmentation and NAT · 2 marks · Multiple choice

Host A sends 8880 bytes of user data by UDP over Ethernet with MTU 1500 bytes. UDP header is 8 bytes and IP header 20 bytes with no options. Find the number of IP fragments and the fragment-offset value of the last.

6 and 925
6 and 7400
7 and 1110
7 and 8880

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Correct answer: (C) 7 and 1110

Explanation

IP payload includes the UDP header, totalling 8888 bytes. Each nonfinal fragment carries at most 1500−20=1480 bytes, divisible by eight. Six such payloads cover 8880 bytes, leaving eight for a seventh fragment. Its offset is 8880/8=1110 in eight-byte units. Thus C.

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