15. In computer networking, the maximum transmission unit (MTU) of a communications protocol of a layer is the size (in bytes) of the largest protocol data unit that the layer can pass onwards. MTU parameters usually appear in association with a communications interface (NIC, serial port, etc.). Standards (Ethernet, for example) can fix the size of an MTU; or systems (such as point-to-point serial links) may decide MTU at connect time. Consider sending a 5600 -byte datagram into a link that has an MTU of 600 bytes. The original datagram is stamped with the identification number 1. Assume that IPv4 is used. Based on the statement above answer the following questions:

a. Distinguish between fragmentation and reassemble process in IPv4 datagrams. b. Identify where the fragmentations occur and where they are being reassembled. c. Calculate the number of fragments that are being generated for the above transmission. d. Discuss the other values of the fragmentation-related fields in the generated IP datagram(s) such as the fragment size, Identification number (ID), offsets number and flag numbers. e. Justify the changes in the datagram, if IPv6 addressing was used.