Network Models
1. The Internet model consists of _______ layers.
A.  Three B.  Five C.  Seven D.  Eight
2. The process-to-process delivery of the entire message is the responsibility of the _______ layer.
A.  Network B.  Transport C.  Application D.  Physical
3. The _______ layer is the layer closest to the transmission medium.
A.  Physical B.  Data link C.  Network D.  Transport
4. Mail services are available to network users through the _______ layer.
A.  Data link B.  Physical C.  Transport D.  Application
5. As the data packet moves from the upper to the lower layers, headers are _______.
A.  Added B.  Removed C.  Rearranged D.  Modified
6. The _______ layer lies between the network layer and the application layer.
A.  Physical B.  Data link C.  Transport D.  None of the above
7. Layer 2 lies between the physical layer and the _______ layer.
A.  Network B.  Data link C.  Transport D.  None of the above
8. When data are transmitted from device A to device B, the header from A's layer 4 is read by B's _______ layer.
A.  Physical B.  Transport C.  Application D.  None of the above
9. The _______ layer changes bits into electromagnetic signals.
A.  Physical B.  Data link C.  Transport D.  None of the above
10. . Which of the following is an application layer service?
A.  Remote log-in B.  File transfer and access C.  Mail service D.  All the above