Question: Fig. 1 illustrates how a message is transmitted from the application layer to the physical layer in the Internet model of a data communication network.

Fig.

1

illustrates how a message is transmitted from the application layer to the physical layer in the Internet model of a data communication network.

.

With the aid of the diagrams of header formats, explain the main purpose of all fields of the header formats of the transport and network layers protocols. For example, the main purpose of the source address and destination address of an IP Header is to provide the sender and receiver IP addresses, respectively.

Fig. 1 illustrates how a message is transmitted

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