2) IP Header (8 marks) a) (6 marks) A Datagram of size 4000 bytes is fragmented resulting in 5 equal sized fragments. The second fragment itself is further fragmented into two equal sized sub-fragments. Compute the offset values of each fragment and sub fragment relative to the original datagram. (2 marks) A packet has arrived in which the offset value is 80, the value of HLEN (header length) field is 5 and the value of the total length field is 100. What is the number of the first byte and the last byte? b)