GATE CS 2025 Set 1 — Question 57
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Computer Networks → Network Layer: Addressing → IPv4 Packet & Fragmentation
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Question
Suppose a message of size bytes is transmitted from a source to a destination using IPv4 protocol via two routers as shown in the figure. Each router has a defined maximum transmission unit (MTU) as shown in the figure, including IP header. The number of fragments that will be delivered to the destination is ________ . (Answer in integer)
Correct answer
7 to 7
Solution
1.Initial Packet: The total size is bytes. Assuming a standard IPv4 header of bytes, the payload is bytes.
2.Router-1 (MTU = 5000 bytes): The maximum payload per fragment must be a multiple of bytes (due to the Fragment Offset field). . The largest multiple of less than or equal to is bytes.
- Fragments from Router-1:
- : Payload = bytes
- : Payload = bytes
- : Payload = bytes
- : Payload = bytes
- ( bytes payload) is fragmented into: fragments.
- ( bytes payload) is fragmented into: fragments.
- ( bytes payload) is fragmented into: fragments.
- ( bytes payload) is smaller than the MTU, so it remains as fragment.
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