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(b) An IP datagram has a header of length 44 octets (including optional fields) and a total length of 2500 octets. It is fragmented by a router into two, such that the first fragment fills an Ethernet frame. [30%] For the original datagram and each fragment, give the numerical values of the following fields of the IP header: header length; total length; more fragments bit; fragment offset. Explain how these values are used during reassembly to reconstruct the original datagram. Include an explanation of how the destination knows it has received all the fragments of the original datagram.