1. In a _______ connection, more than two devices can share a single link.

(a) Point-to-point
(b) Primary
(c) Multi-point
(d) Secondary
View Answer
(c) Multi-point

2. Communication between a computer and a keyboard involves ______________

transmission
(a) Full-duplex
(b) Half-duplex
(c) Simplex
(d) None of these
View Answer
(c) Simplex

3. In a network with 25 computers, which topology would require the most

extensive cabling?
(a) Star
(b) Mesh
(c) Bus
(d) None of these
View Answer
(b) Mesh

4. Which topology requires a central controller or hub?

a. Star
b. Mesh
c. Bus
d. Ring
View Answer
a. Star

5. The _______ is the physical path over which a message travels.

a. Protocol
b. Medium
c. Signal
d. All of the above
View Answer

6. Which organization has authority over interstate and international commerce in the
communications field?
a. ITU-T
b. IEEE
c. ISO
d. FCC
View Answer
d. FCC

7. The information to be communicated in a data communications system is the ________

a. Medium
b. Protocol
c. Transmission
d. Message
View Answer
d. Message

8. Frequency of failure and network recovery time after a failure are measures of the
_______ of a network.
a. Performance
b. Security
c. Reliability
d. Feasibility
View Answer
(c) Reliability

9. In _______ transmission, the channel capacity is shared by both communicating

devices at all times.
a. Full-duplex
b. Simplex
c. Half-duplex
d. Half-Simplex
View Answer
(a) Full-duplex

10. An unauthorized user is a network _______ issue.

a. Performance
b. Reliability
c. Security
d. All of the above
View Answer
(c) Security

11. Which topology requires a multipoint connection?

a. Mesh
b. Star
c. Ring
d. Bus
View Answer
(d) Bus

12. A television broadcast is an example of _______ transmission.

a. Half-duplex
b. Full-duplex
c. Simplex
d. Automatic
View Answer
(c) Simplex

13. A _______ connection provides a dedicated link between two devices.

a. Multi-point
b. Point-to-Point
c. Primary
d. Secondary
View Answer
(b) Point-to-Point

14. A cable break in a _______ topology stops all transmission.

a. Mesh
b. Star
c. Primary
d. Bus
View Answer
(d) Bus

15. The _______ layer changes bits into electromagnetic signals.

a. Physical
b. Transport
c. None of the above
d. Data link
View Answer
(a) Physical

16. The physical layer is concerned with the transmission of _______ over the
physical medium.
a. Programs
b. Protocols
c. Bits
d. Dialog
View Answer
c. Bits

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

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

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

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

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

22. When data are transmitted from device A to device B, the header from A’s layer 4 is
read by B’s _______ layer.
a. Application
b. Physical
c. Transport
d. None of the above
View Answer
c. Transport

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

24. What is the main function of the transport layer?

a. Process-to-process delivery
b. Node-to-node delivery
c. Synchronization
d. Updating and maintenance of routing tables
View Answer
a. Process-to-process delivery

25. 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
View Answer
d. All the above

26. The Internet model consists of _______ layers.

a. Three
b. Five
c. Seven
d. Eight
View Answer
b. Five

27. The process-to-process delivery of the entire message is the responsibility of

the _______ layer.
a. Physical
b. Network
c. Transport
d. Application
View Answer
c. Transport

28. The _______ layer is the layer closest to the transmission medium.
a. Network
b. Physical
c. Data link
d. Transport
View Answer
b. Physical

29. Before data can be transmitted, they must be transformed to ________.

a. Electromagnetic signals
b. Periodic signals
c. Aperiodic signals
d. Low-frequency sine waves
View Answer
a. Electromagnetic signals
30. When one of the components of a signal has a frequency of zero, the average
amplitude of the signal ________.
a. Is less than zero
b. Is greater than zero
c. Is zero
d. (a) or (b)
View Answer
b. Is greater than zero

31. A periodic signal can always be decomposed into ________.

a. Exactly an odd number of sine waves
b. A set of sine waves, one of which must have a phase of 0°
c. A set of sine waves
d. None of the above
View Answer
c. A set of sine waves

32. A periodic signal completes one cycle in 0.001 s. What is the frequency?
a. 1 Hz
b. 100 Hz
c. 1 KHz
d. 1 MHz
View Answer
c. 1 KHz

33. In a frequency-domain plot, the horizontal axis measures the ________.

a. Frequency
b. Peak amplitude
c. Phase
d. Slope
View Answer
a. Frequency

34. In a time-domain plot, the vertical axis is a measure of ________.

a. Frequency
b. Phase
c. Amplitude
d. Time
View Answer
c. Amplitude

35. If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest
frequency?
a. 5 KHz
b. 10 KHz
c. 47 KHz
d. 57 KHz
View Answer
d. 57 KHz
36. What is the bandwidth of a signal that ranges from 40 KHz to 4 MHz?
a. 3.96 MHz
b. 36 MHz
c. 360 KHz
d. 396 KHz
View Answer
a. 3.96 MHz

37. As frequency increases, the period ________.

a. Decreases
b. Increases
c. Remains the same
d. Doubles
View Answer
a. Decreases

38. When propagation speed is multiplied by propagation time, we get the ________.
a. Throughput
b. Wavelength of the signal
c. Distance a signal or bit has traveled
d. Distortion factor
View Answer
c. Distance a signal or bit has traveled

39. Propagation time is ________ proportional to distance and ________ proportional to

propagation speed.
a. Inversely; directly
b. Inversely; inversely
c. Directly; inversely
d. Directly; directly
View Answer
c. Directly; inversely

40. Wavelength is ________ proportional to propagation speed and ________ proportional

to period.
a. Directly; directly
b. Inversely; directly
c. Directly; inversely
d. Inversely; inversely
View Answer
a. Directly; directly

41. Which of the following can be determined from a frequency-domain graph of a signal?
a. Phase
b. Power
c. Frequency
d. Bandwidth
View Answer
d. Bandwidth
42. Which of the following can be determined from a frequency-domain graph of a signal?
a. Phase
b. Bandwidth
c. Power
d. All the above
View Answer
b. Bandwidth

43. In a frequency-domain plot, the vertical axis measures the ________.

a. Frequency
b. Peak amplitude
c. Phase
d. Slope
View Answer
b. Peak amplitude

44. Given two sine waves A and B, if the frequency of A is twice that of B, then the period
of B is ________ that of A.
a. One-half
b. Twice
c. The same as
d. Indeterminate from
View Answer
b. Twice

45. The wavelength of green light in air is ________ the wavelength of green light in fiber-
optic cable.
a. Greater than
b. Less than
c. Equal to
d. None of the above
View Answer
b. Less than

46. Using the Shannon formula to calculate the data rate for a given channel, if C = B, then
________.
a. The signal is equal to the noise
b. The signal is less than the noise
c. The signal is greater than the noise
d. Not enough information is given to the question
View Answer
a. The signal is equal to the noise

47. A sine wave is ________.

a. Aperiodic and continuous
b. Periodic and discrete
c. Aperiodic and discrete
d. Periodic and continuous
View Answer
d. Periodic and continuous

48. If the maximum amplitude of a sine wave is 2 V, the minimum amplitude is ________ V.
a. 2
b. 1
c. -2
d. Between -2 and 2
View Answer
c. -2

49. A signal is measured at two different points. The power is P1 at the first point and P2 at
the second point. The dB is 0. This means ________.
a. P2 is zero
b. P2 equals P1
c. P2 is much larger than P1
d. P2 is much smaller than P1
View Answer
b. P2 equals P1

50. ________ is a type of transmission impairment in which the signal loses strength due
to the resistance of the transmission medium.
a. Distortion
b. Noise
c. Decibel
d. Attenuation
View Answer
d. Attenuation

51. ________ is a type of transmission impairment in which the signal loses strength due
to the different propagation speeds of each frequency that makes up the signal.
a. Attenuation
b. Noise
c. Distortion
d. Decibel
View Answer
c. Distortion

52. ________ is a type of transmission impairment in which an outside source such as

crosstalk corrupts a signal.
a. Attenuation
b. Noise
c. Distortion
d. Decibel
View Answer
b. Noise
53. The ________ has units of meters/second or kilometers/second.
a. Throughput
b. Propagation time
c. Propagation speed
d. (b) and (c)
View Answer
c. Propagation speed

54. ________ has units of bits/second.

a. Throughput
b. Propagation speed
c. Propagation time
d. (b) and (c)
View Answer
a. Throughput

55. The ________ has units of seconds.

a. Throughput
b. Propagation time
c. Propagation speed
d. (a) and (b)
View Answer
b. Propagation time

56. The wavelength of a signal depends on the ________.

a. Frequencies of the signal
b. Medium
c. Phase of the signal
d. (a) and (b)
View Answer
d. (a) and (b)

57. Which encoding technique attempts to solve the loss of synchronization due to long strings of
0s?
a. NRZ
b. BnZS
c. AMI
d. (a) and (b)
View Answer
b. BnZS
58. Block coding can help in _______ at the receiver.
a. Synchronization
b. Error detection
c. Attenuation
d. (a) and (b)
View Answer
d. (a) and (b)

59. In _______ transmission, bits are transmitted simultaneously, each across its own wire.
a. Parallel
b. Asynchronous serial
c. Synchronous serial
d. (a) and (b)
View Answer
a. Parallel

60. Unipolar, bipolar, and polar encoding are types of _______ encoding.
a. Block
b. Line
c. NRZ
d. Manchester
View Answer
b. Line
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2. The process-to-process
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
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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?

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A. Remote log-in
B. File transfer and access
C. Mail service
D. All the above

Answer key for MCQ SET- 1

Q-1 Correct Answer :Five
Q-2 Correct Answer :Transport
Q-3 Correct Answer :Physical
Q-4 Correct Answer :Application
Q-5 Correct Answer :Added
Q-6 Correct Answer :Transport
Q-7 Correct Answer :Network
Q-8 Correct Answer :Transport
Q-9 Correct Answer :Physical
Q-10 Correct Answer :All the above

Network Model Multiple Choice Questions and Answers

(MCQ) Set-2

1. Why was the OSI model developed?

A. Manufacturers disliked the TCP/IP protocol suite
B. The rate of data transfer was increasing exponentially
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C. Standards were needed to allow any two systems to

communicate
D. None of the above

2. The _______ model shows how the network functions of a

computer ought to be organized.
organized
A. CCITT
B. OSI
C. ISO
D. ANSI

3. The physical layer is concerned with the movement of _______

over the physical medium.
medium
A. programs
B. dialogs
C. protocols
D. bits

4. The OSI model consists of _______ layers.

A. three
B. five
C. seven
D. eight

5. In the OSI model, as a data packet moves from the lower to the
upper layers, headers are _______.
A. added
B. removed
C. rearranged
D. modified
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6. In the OSI model, when data is transmitted from device A to

device B, the header from A's layer 5 is read by B's _______ layer.
A. physical
B. transport
C. session
D. presentation

7. In the OSI model, what is the main function of the transport

layer?
A. node-to-node
node delivery
B. process-to-process
process message delivery
C. synchronization
D. updating and maintenance of routing tables

8. In the OSI model, encryption and decryption are functions of the

________ layer.
A. transport
B. session
C. presentation
D. application

9. When a host on network A sends a message to a host on network

B, which address does the router look at?
A. port
B. logical
C. physical
D. none of the above
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10. To deliver a message to the correct application program

running on a host, the _______ address must be consulted
consulted.
A. port
B. IP
C. physical
D. none of the above

Answer key for MCQ SET- 2

Q-1 Correct Answer :Standards were needed to
allow any two systems to communicate
Q-2 Correct Answer :OSI
Q-3 Correct Answer :bits
Q-4 Correct Answer :seven
Q-5 Correct Answer :removed
Q-6 Correct Answer :session
Q-7 Correct Answer :process-to-process
:process process message
delivery
Q-8 Correct Answer :presentation
Q-9 Correct Answer :logical
Q-10 Correct Answer :port
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Network Model Multiple Choice Questions and Answers

(MCQ) Set-3

1. IPv6 has _______ -bit

bit addresses.
A. 32
B. 64
C. 128
D. variable

2. ICMPv6 includes _______

A. IGMP
B. ARP
C. RARP
D. a and b

3. The ______ layer is responsible for moving frames from one hop
(node) to the next.
A. physical
B. data link
C. transport
D. none of the above

4. The ______ layer adds a header to the packet coming from the
upper layer that includes the logical addresses of the sender and
receiver.
A. physical
B. data link
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9

C. network
D. none of the above

5. The_________ layer is responsible for the delivery of a message

from one process to another.
another
A. physical
B. transport
C. network
D. none of the above

6. The Internetworking Protocol (IP) is a ________ protocol

A. reliable
B. connection-oriented
oriented
C. both a and b
D. none of the above

7. ______ is a process-to
to-process protocol that adds only port
addresses, checksum error control, and length information to the
data from the upper layer.
layer
A. TCP
B. UDP
C. IP
D. none of the above

8. _________ provides full transport layer services to applications.

A. TCP
B. UDP
C. ARP
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D. none of the above

9. The ________ address, also known as the link address, is the

address of a node as defined by its LAN or WAN
A. port
B. physical
C. logical
D. none of the above

10. Ethernet uses a ______ physical address that is imprinted on

the network interface card (NIC)
A. 32-bit
B. 64-bit
C. 6-byte
D. none of the above

Answer key for MCQ SET- 3

Q-1 Correct Answer :128
Q-2 Correct Answer :a and b
Q-3 Correct Answer :data link
Q-4 Correct Answer :network
Q-5 Correct Answer :transport
Q-6 Correct Answer :none of the above
Q-7 Correct Answer :UDP
Q-8 Correct Answer :TCP
Q-9 Correct Answer :physical
Q-10 Correct Answer :6-byte
:6
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Network Model Multiple Choice Questions and Answers

(MCQ) Set-4

1. A port address in TCP/IP is ______ bits long.

A. 32
B. 48
C. 16
D. none of the above

2. The ____ created a model called the Open Systems

Interconnection, which allows diverse systems to communicate.
A. OSI
B. ISO
C. IEEE
D. none of the above

3. The seven-layer _____ model provides guidelines for the

development of universally compatible networking protocols
protocols.
A. OSI
B. ISO
C. IEEE
D. none of the above
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4. The physical, data link, and network layers are the ______
support layers.
A. user
B. network
C. both (a) and (b)
D. neither (a) nor (b)

5. The session, presentation, and application layers are the ____

support layers.
A. user
B. network
C. both (a) and (b)
D. neither (a) nor (b)

6. The _______ layer links the network support layers and the user
support layers.
A. transport
B. network
C. data link
D. session

7. The _______ layer coordinates the functions required to transmit

a bit stream over a physical medium.
A. transport
B. network
C. data link
D. physical
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8. The _______ layer is responsible for delivering data units from

one station to the next without errors.
A. transport
B. network
C. data link
D. physical

9. The ______ layer is responsible for the source-to-destination

destination
delivery of a packet across multiple network links.
A. transport
B. network
C. data link
D. physical

10. The ________ layer is responsible for the process-to--process

delivery of the entire message.
message
A. transport
B. network
C. data link
D. physical
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Answer key for MCQ SET- 4

Q-1 Correct Answer :16
Q-2 Correct Answer :ISO
Q-3 Correct Answer :OSI
Q-4 Correct Answer :network
Q-5 Correct Answer :user
Q-6 Correct Answer :transport
Q-7 Correct Answer :physical
Q-8 Correct Answer :data link
Q-9 Correct Answer :network
Q-10 Correct Answer :transport

Network Model Multiple Choice Questions and Answers

(MCQ) Set-5

1. The ______ layer establishes, maintains, and synchronizes the

interactions between communicating devices.
A. transport
B. network
C. session
D. physical
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2. The _______ layer ensures interoperability between

communicating devices through transformation of data into a
mutually agreed upon format.
format
A. transport
B. network
C. data link
D. presentation

3. The _________ layer enables the users to access the network

A. transport
B. application
C. data link
D. physical

4. TCP/IP is a ______ hierarchical protocol suite developed ____ the

OSI model.
A. seven-layer;
layer; before
B. five-layer; before
C. six-layer; before
D. five-layer; after

5. The TCP/IP _______ layer is equivalent to the combined session,

presentation, and application layers of the OSI model
A. application
B. network
C. data link
D. physical
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6. The ________ address, also known as the link address, is the

address of a node as defined by its LAN or WAN
A. physical
B. IP
C. port
D. specific

7. The ____ address uniquely defines a host on the Internet

A. physical
B. IP
C. port
D. specific

8. The_____ address identifies a process on a host

A. physical
B. IP
C. port
D. specific

Answer key for MCQ SET-

SET 5
Q-1 Correct Answer :session
Q-2 Correct Answer :presentation
Q-3 Correct Answer :application
Q-4 Correct Answer :five-layer;
:five before
Q-5 Correct Answer :application
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Q-6 Correct Answer :physical

Q-7 Correct Answer :IP
Q-8 Correct Answer :port
Q-9
Q-10