ESAT Forouzan - Chapter 2: Network Models

Question 1

The Internet model consists of _________ layers.
a. Three
b. Five
c. Seven
d. Eight

Answer 1

b. Five

Question 2

The process-to-process delivery of the entire message is the responsibility of the ___________ layer.
a. Network
b. Transport
c. Application
d. Physical

Answer 2

b. Transport

Question 3

The __________ layer is the layer closest to the transmission medium.
a. Physical
b. Data link
c. Network
d. Transport

Answer 3

a. Physical

Question 4

Mail services are available to network users through the __________ layer.
a. Data link
b. Physical
c. Transport
d. Application

Answer 4

d. Application

Question 5

As the data packet moves from the lower to the upper layers, headers are ________.
a. Added
b. Subtracted
c. Rearranged
d. Modified

Answer 5

b. Subtracted

Question 6

As the data packet moves from the upper to the lower layers, headers are __________.
a. Added
b. Removed
c. Rearranged
d. Modified

Answer 6

a. Added

Question 7

The __________ layer lies between the network layer and the application layer.
a. Physical
b. Data link
c. Transport
d. None of the above

Answer 7

c. Transport

Question 8

Layer 2 lies between the physical layer and the _____________ layer.
a. Network
b. Data link
c. Transport
d. None of the above

Answer 8

a. Network

Question 9

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

Answer 9

b. Transport

Question 10

The ____________ layer changes bits into electromagnetic signals.
a. Physical
b. Data link
c. Transport
d. None of the above

Answer 10

a. Physical

Question 11

The physical layer is concerned with the transmission of _____________ over the physical medium.
a. Programs
b. Dialogs
c. Protocols
d. Bits

Answer 11

d. Bits

Question 12

Which layer functions as a liaison between user support layers and network support layers?
a. Network layer
b. Physical layer
c. Transport layer
d. Application layer

Answer 12

c. Transport layer

Question 13

What is the main function of the transport layer?
a. Node-to-node delivery
b. Process-to-process delivery
c. Synchronization
d. Updating and maintenance of routing tables

Answer 13

b. Process-to-process delivery

Question 14

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

Answer 14

d. All of the above