(25 pts) 4. The diagram below shows a TCP connection between Hosts HA and Hb passing through networks with different values of Maximum Transmission Unit (MTU) shown. IPv4 is in use. MTU 4000 bytes MTU 1500 bytes MTU 4000 bytes HA HB Router 1 Router 2 (10 pts) (4.1). H chooses a TCP segment size of 3000 bytes of data (TCP and IP headers are each 20 bytes in size). (i) Describe the way in which fragmentation takes place as HA sends data to HB. Explain the process, such as which router will perform the fragmentation? (ii) Who will be responsible for reassembly? (iii) Then fill the table below to show the arithmetic used to calculate fragment sizes. Fragment Flag Fragment # Total Bytes Header Bytes Data Bytes Fragment Offset (8 byte blocks)