As user data makes its way down the protocol stack at each l

As user data makes its way down the protocol stack, at each level the following things occur;

A) Processing

B) Encapsulation

C) Addition of headers and/or trailers

D) Creation of PDU\'s

E) All of the above

Which of the following items is NOT to be found in the header of a Transport Layer PDU?

A) IP address of destination system

B) Destination SAP/port

C) Sequence number

D) None of the above

When a module in a protocol stack must obtain services, which \"services definition\" applies?

A) The service definition of the module \"above\" the module seeking service

B) The service definition of the module \"below\" the module seeking service

C) Its own service definition

D) None of the above

Thanks in advance

Solution

As user data makes its way down the protocol stack, all the above thing occur, at each level.

Therefore, the answer is: E) All of the above

IP address will be added in the network layer, therefore, IP address will not be found in the transport layer PDU.

Therefore, the answer is: A) IP address of destination system

When a module in a protocol stack must obtain services, which \"services definition\" applies?

B) The service definition of the module \"below\" the module seeking service

Always, the below layer provides service to the above layer.