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28 May, 06:58

Assume that there is no option field in the header of an IPv4 datagram. Which field (s) of the IPv4 header change from router to router?

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  1. 28 May, 09:15
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    The fields of the IPv4 header change from router to router is:

    No Fragmentation - TTL, checksum (due to TTL). Fragmentation - Total length field, fragment M bit.

    Explanation:

    TTL - TTL stands for Time-TO-Live, it is important in an IP (Internet Protocol) packets that says a network router if or not the packets have been in the network so lengthy and should be rejected.

    Fragmentation - It is done through the network layer when the mostly size of data-gram is higher than max size of data that can held a frame.

    It is done through the network layer at the end side and is generally done at routers.
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