5pts Assume a five layer TCPIP model as shown in the class n

(5pts) Assume a five layer TCP/IP model as shown in the class notes. The initial data at the application layer is 170 bytes. A 50 byte header is added at each of the transport, network, and data link layers. The data link layer trailer is 10 bytes. What are the total bytes sent to the hardware? In percentages, what is the overhead? In percentages, what is the portion of the total bytes sent that is data? Show your work to get full credit.

Solution

ans) After processing the program request, the protocol on the Application layer
will talk to another protocol from the Transport layer, usually TCP. This layer is in
charge of getting data sent by the upper layer, dividing them into packets and sending
them to the layer below, Internet. Also, during data reception, this layer is in charge of putting
the packets received from the network in order (because they can be received out-of-order) and
also checking if the contents of the packets are intact.
On the Internet layer we have the IP (Internet Protocol), which gets the packets received from the
Transport layer and adds virtual address information, i.e., adds the address of the computer that is
sending data and the address of the computer that will receive this data. These virtual addresses are called IP addresses.
Then the packet is sent to the lower layer, Network Interface. On this layer packets are called datagrams.