Q9,paper3,D12.If a packet arrive with an M-bit value is ‘l’ and a fragmentation offset value ‘0’, then it is ______ fragment.

(A) First
(B) Middle
(C) Last
(D) All of the above
Answer(A)
Fragment Offset :-This 13-bit field indicates the position of a particular fragment's data in relation to the first byte of data (offset 0).It is possible that the fragments that comprise a block of data might travel along different paths to the destination, it is possible they might arrive out of sequence. While the Identification Field serve to mark which IP fragments belong to which block of data, it is the Fragment Offset Field, sometimes referred to as the Fragmentation Offset Field, that tells the receiving device which order to reassemble them in.
During the IP Fragmentation Reassembly process, if a particular fragment is found to be missing, as indicated by the Fragmentation Offset count, the buffer will enter a wait state until either the missing piece(s) are received or a time out occurs. In the event of such a time out, the buffer simply discards the fragments.