assignment exampleHomework assignments included around 15 exercises adopted and adapted from 4, 5, 6, 7. Thefollowing is an example adapted from 5, Chapter 4: “Consider the network shown in Figure 4. The network layer at node A receives 4000 bytesfrom the transport layer, to be sent to node B. Assume that the MTU (in bytes) of the copperEthernet network, copper serial network, optical fiber network, and copper Ethernet network is10000, as shown in the figure. Assume also that the final hop, the wireless network, has an MTUof 1420. (a) How will the transfer happen in each router? (b) Explain also, in detail, what R4 willdo, including fragmentation process, number of fragments, and fragmentation offset field in theIP packet/s