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The question states – An IP datagram using Strict source routing option has to be fragmented. Do you think the option is copied into each fragment, or is it sufficient to just put it in the first fragment? Explain your answer.

My thinking was that we only need to put the option in first fragment. If the router sees subsequent fragments that need to be routed to the same path strictly, it can simply see the “identification” on those fragments. If the number matches with the first fragment that followed strict source routing, we can send it over the same path. This way, we can avoid providing the strict source routing option in each fragment.

However, the solution manual I’m following to verify my answers says that the option has to be put in every fragment because we have to route every fragment. I doubt this reasoning and don’t see any flaws in my own answer. Where is my answer lacking?

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