1. The ........ layer links the network support layers and the user support layers.
A. transport
B. network
C. data link
D. session
2) The ............. layer changes bits into electromagnetic signals.
A. physical
B. data link
C. transport
D. network
3) The .......... layer coordinates the functions required to transmit a bit stream over a physical medium.
A. transport
B. network
C. data link
D. physical
4) Which of the following is an application layer service?
A. remote log-in.
B. file transfer and access.
C. mail service
D. all of the above
5) The ......... layer is responsible for the source-to-destination delivery of a packet across multiple network links.
A. transport
B. network
C. data link
D. session
6) The .......... layer is the layer closest to the transmission medium.
A. physical
B. data link
C. network
D. transport
7) The ...........layer is responsible for the process-to-process delivery of th entire message.
A. transport
B. network
C. data link
D. physical
8) Mail services are available to network users through the .......... layer.
A. data link
B. physical
C. transport
D. application
9) The ........... layer establishes, maintains, and synchronizes the interactions between communicating devices.
A. transport
B. network
C. session
D. physical
10) The .......... layer lies between the network layer and the application layer.
A. physical
B. data link
C. transport
D. session
11) The .......... layer ensures interoperability between communicating devices through transformation of data into a mutually agreed upon format.
A. transport
B. network
C. data link
D. presentation
12) Transmission media lies below the .........layer.
A. physical
B. network
C. transport
D. application
13) The ........... layer enables the users to access the network.
A. session
B. application
C. data link
D. physical
14) Circuit switching takes place at the .......... layer.
A. data link
B. physical
C. network
D. transport
15) The ............ layer is responsible for moving frames form one node to the next.
A. physical
B. data link
C. transport
D. session
16) The routing processor of a router performs the ........ layer functions of the router.
A. physical and data link
B. network
C. transport
D. session
17) The ............. layer adds a header to the packet coming from the upper layer that includes the logical address of the sender and receiver.
A. physical
B. data link
C. network
D. transport
18) Network layer lies on .......... layer.
A. physical
B. data link
C. network
D. transport
19) The ...........layer is responsible for the delivery of a message from one process to another.
A. physical
B. transport
C. network
D. session
20) The data link layer takes the packet it gets from the network layer and encapsulates them into ......
A. cells
B. frames
C. packet
D. trailer
Answers:
1) A. transport
2) A. physical
3) D. physical
4) D. all of the above
5) B. network
6) A. physical
7) A. transport
8) D. application
9) C. session
10) C. transport
11) D. presentation
12) A. physical
13) B. application
14) B. physical
15) B. data link
16) B. network
17) C. network
18) A. physical
19) B. transport
20) B. frames
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