1-Routing and forwarding are two key functions of the network layer. Discuss the

1-Routing and forwarding are two key functions of the network layer. Discuss the differences between them.
2-A packet has arrived in which the offset value is 100, the value of HLEN is 4, and the value of the total length field is 100. What are the numbers of the first byte and the last byte?
3-Determine the class, Network ID, Host ID, and number of hosts.
12.12.12.122
Class?
Network ID?
Host ID?
Maximum number of hosts?
4-What are the main responsibilities and functions of the transport layer in network communication?