MCQs of Data
Communication and
Networking
Q1) Layered tasks involves three layers that are
a)
b)
c)
d)
Sender Receiver and protocol
Sender Receiver and Carrier
Sender and Transmission medium
Sender Receiver and transmission Medium
Q2) OSI stands for __________
open system interconnection
b) operating system interface
c) optical service implementation
d) open service Internet
Q3) Which layer is used to link the network support layers
and user support layers?
a) session layer
b) data link layer
c) transport layer
d) network layer
Q4) Which layer is responsible for process to process
delivery in a general network model?
a) network layer
b) transport layer
c) session layer
d) data link layer
Q5) Which address is used to identify a process on a host
by the transport layer?
a) physical address
b) logical address
c) port address
d) specific address
Q6) Which layer provides the services to user?
a) application layer
b) session layer
c) presentation layer
d) physical layer
Q7) Transmission data rate is decided by ____________
a) network layer
b) physical layer
c) data link layer
d) transport layer
Q8) An _______ standard that covers all aspects of network
communications is the Open Systems Interconnection
model
a) ANSI
b) EIA
c) ISO
d) OSI
Q9) The OSI model is a _______ layer model for the design
of network systems.
a)
Two
b)
Five
c)
Seven
d)
eight
Q10) In the OSI model, headers are added to the data
packet at every layer except _______
a)
b)
c)
layer 7
layer 1
a and b
d)
none of these
Q11) In the OSI model, a trailer is added to the data packet
at layer _______
a)
one
b)
two
c)
three
d)
four
Q12) In a peer-to-peer process, layer 4 on machine A
communicates with layer _______ on machine B.
a)
b)
c)
d)
1
2
3
4
Q13) In _______ process, layer n on the sending machine
communicates with layer n on the receiving machine.
a) an interface-to-interface
b)
a peer-to-peer
c) a layer-to-layer
d)
machine-to-machine
Q14) The OSI model defines layers 1, 2, and 3 as the
_______ layers
a) physical support
b)
network support
c) user support
d)
transport
Q15) The OSI model defines layers 5, 6, and 7 as the
_______ layers
a) physical support
b)
network support
c) user support
d)
transport
Q16) The OSI _______ layer is implemented mainly by
software
a) application
b)
session
c) presentation
d)
all of the above
Q17) The OSI _______ layer is implemented mainly by
hardware
a) application
b)
session
c) presentation
d)
physical
Q18) As the data packet moves from the _______ layer
down to the _______ layer, headers and a trailer are added
a)application; physical
b)
physical; application
c) network; application
d)
data link; application
Q19) At the _______ layer, the data unit is transformed into
the corresponding electromagnetic signal.
a) application
b) data link
c) session
d) physical
Q20) The _______ is defined by the physical layer.
a) logical address
b)
session dialog
c) data rate
d)
encryption method
Q21) The _______ layer defines the transmission medium
a) application
b)
session
c) presentation
d)
physical
Q22) The _______ layer defines the type of encoding to be
used
a) application
b)
transport
c) data link
d)
physical
Q23) The_________ layer lies between the session layer
and the application layer.
a. network layer
b. transport layer
c. data link layer
d. presentation layer
Q24) Decryption and encryption are the features of
a. transport layer
b. presentation layer
c. session layer
d. physical layer
25) Subnet usually comprises
a. layer 1 and 2
b. layer 1 through 3
c. all layers
d. none of the above
Q26) The layer is responsible for process delivery
a. network layer
b. transport layer
c. session layer
d. data link layer
Q27) The_________ layer uses data compression yo reduce
the number of bits to be transmitted.
a. presentation
b. network
c. data link
d. application
Q28) The data link layer takes the packets from _________
and sends them into frames for transmission.
a) application layer
b) physical layer
c) network layer
d)all of the above
Q29) Datalink is not able to perform
a) channel coding
b) flow control
c) error control
d) framing
Q30) The data link layer divide the stream of bits received
from the network layer into data units is known as
a)frame
b)segment
c)datagrams
d)message
Q31) data link protocol known as??
a) HDLC
b) point to point protocol
c) ethernet
d) all of the mentioned
Q32) The layer lies above the physical layer is
a)data
b)data link
c)network layer
d)transport layer
Q33) In a real-life network, data link protocols are used as
a)in any direction
b)in one direction
c)in two direction
d)in any direction
Q34) Which Layer do Error control to compensate for the
imperfections of the physical layer?
a)Physical Layer
b)data link
c)network layer
d)transport layer
Q34) Flow control to keep a fast sender from swamping a
slow receiver is a feature of?
a)Physical Layer
b)data link
c)network layer
d)transport layer
Q35) Each layer of the OSI model receives services or data
from a ___ layer.
a)Below Layer
b)
Above Layer
c) From both side
d)
A and C
Q36) In the OSI model, each layer gives services or data to
the __ layer.
a) Below Layer
b)
Above Layer
c) From both side
d)
A and C
Q37) A layer of the OSI model on one system communicates
with the ___ layer of its peer system.
a) Below Layer
b)
Above Layer
c) Same Layer
d)
None of these
Q38) In an OSI model, the lowest layer is the ___ layer.
.
a)Application Layer
b) Physical Layer
c) Presentation Layer
d)Data Link Layer
Q39) In the OSI model, which is the highest layer?
A)
Application Layer
B)
Physical Layer
C)
Presentation Layer
D)
Network Layer
Q40) In the OSI model, the bottom 3 layers assist in ___.
A) converting data
B) transporting data
C) Comprising Data
D) Encrypting Data
Q41) What are the advantages of 7 layers of OSI model?
A) Troubleshooting the network is easy.
B) Developing new functions or services for a particular
layer is easy.
C) Developing hardware devices targetting certain layers is
easy because the services to be offered are fixed.
D) All the above
Q42) A set of standards that define how to communicate
with each layer of the OSI model are ___.
A) functions
B) protocols
C) data formats
D) All the above.
Q43) The transmission media like ___ are part of the
Physical layer of OSI model.
A) Copper cables
B) OFC - Optical Fiber Cables
C) RF - Radio Frequency waves including Microwaves
D) All the above
Q44) An ethernet cable is part of __ layer in the OSI model.
A) Physical layer
B) Data Link Layer
C) Network Layer
D) Transport Layer
Q45) Which is the layer of the OSI reference model that
employs Error Detection?
A) Physical Layer
B) Data Link Layer
C) Network Layer
D) Session Layer
Q46) Which is the layer that converts Packets to Frames and
Frames to Packets in the OSI model?
A) Physical Layer
B) Data Link Layer
C) Network Layer
D) Transport Layer
Q47) Which is the layer that converts Raw Bits to Frames
and Frames to Raw Bits in the OSI model?
A) Physical Layer
B) Data Link Layer
C) Network Layer
D) Transport Layer
Q48) to provide reliable process-to-process message
delivery and error recovery is responsibility of
a) Physical Layer
b)
Data Link Layer
c) Network Layer
d)
Transport Layer
Q49) to establish manage and terminate session is feature
of
a)
Transport Layer
b)
Session Layer
c) Presentation Layer
d)
Application Layer
Q50) The _____ layer is responsible for dialog control and
synchronization.
a) Network Layer
b)
Transport Layer
c) Session Layer
d)
Presentation Layer
1.Before data can be transmitted, they must be transformed to……...
a. periodic signals
b. electromagnetic signals
c. aperiodic signals
d. low-frequency sine waves
2. in a frequency-domain plot, the horizontal axis measures the…….
a. peak amplitude
b. frequency
c. phase
d. slope
3.what is the bandwidth of a signal that ranges from 1MHz to 4MHz?
a.4 MHz
b. 1KHz
b.3MHz
d. None of the above
4.As frequency increases, the period ………
a. increase
b. decreases
c. remains the same
d. doubles
5. A sine wave is ……………
a.
b.
c.
d.
periodic and continuous
aperiodic and continuous
periodic and discreate
aperiodic and discreate
6.if the maximum amplitude of a sine wave is 2V, the maximum amplitude is …………….V
a. 2
b.1
c. -2
d. 0
7. ---------- is a type of transmission impairment in which the signal loss strength due to the
resistance of the transmission medium.
a. Attenuation
b. Distortion
c. Noise
d. Decibel
8. -------------is a type of transmission impairment in which an outside source such as crosstalk
corrupts a signal.
a. Attenuation
b. Distortion
c. Noise
d. Decibel
9. Data can be------------a. analog
b. Digital
c.(a) or (b)
d. none of the above
10. ---------data are continuous and take continuous values.
a. analog
b. Digital
c.(a) or (b)
d. none of the above
11. -------------signals can have an infinite number of values in a range.
a. analog
b. Digital
c.(a) or (b)
d. none of the above
12.frequency and period are -------
a. inverse of each other
b. proportional to each other
c. the same
d. none of the above
13.---------------is the rate of change with respect to time.
a. Amplitude
b. Time
c. frequency
d. voltage
14. A--------------sine wave is not useful in data communication; we need to send a ---------signal.
a. composite; single-frequency
b. single-frequency; composite
c. single-frequency; double- frequency
d. none of the above
15. The------of a composite signal is the difference between the highest and the lowest
frequencies in that signal.
a. frequency
b. period
c. bandwidth
d. amplitude
16. A(n) ----------------signal is a composite analog signal with an infinite bandwidth.
a. analog
b. Digital
c.(a) or (b)
d. none of the above
17. baseband transmission of a digital signal is possible only if we have a -------channel.
a. low-pass
b. bandpass
c. low rate
d. high rate
18. if the available channel is a -----------channel, we cannot send a digital signal directly to the
channel.
a. low-pass
b. bandpass
c. low rate
d. high rate
19. ------------- is a type of transmission impairment in which the signal loss strength due to the
different propagation speeds of each frequency that makes up the signal.
a. Attenuation
b. Distortion
c. Noise
d. Decibel
20. In a time-domain plot, the horizontal axis is a measure of-------------a. signal amplitude
b. frequency
c. phase
d. time
21. to deliver a message to the correct application program running on a host , the -------address must be consulted.
a. port
b. IP
c. physical
d. none of the above
22. IPV6 has -----bit addresses.
a.32
b.64
c.128
d. variable
23.------------------provides full transport layer services to application.
a. TCP
b. UDP
c. ARP
D. none of the above
24. The -----address, also known as the link address, is the address of a node as defined by its
LAN or WAN
a. port
b. Logical
c. physical
d. none of above
25. Ethernet uses a ----------physical address that is important on the network interface
card(NIC)
a. 32-bit
b. 64-bit
c.6-byte
d. 8-byte
26. TCP/IP is a ---------------hierarchical protocol suite developed -----the OSI model.
a. seven-layer; before
b. five-layer; before
c. six-layer; before
d. five-layer; after
27. 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
28. the internet model consist of -------layers
a.
b.
c.
d.
Three
Five
Seven
Eight
29. The ---------address identifies a process on a host.
a.
b.
c.
d.
Physical
IP
Port
Specific
30. A port address in TCP/IP is -----bits long
a. 32
b. 48
c. 16
d. none of the above
31. The internetworking Protocol (IP) is a --------------protocol.
a. reliable
b. connection-oriented
c. both a and b
d. none of the above
32.The ------------layer changes bits into electromagnetic signals.
a. physical
b. data link
c. transport
d. none of the above
33. -------has units of bits /second.
a. throughput
b. propagation speed
c. propagation time
34. the wavelength of a signal depends on the -----------a. frequencies of the signal
b. medium
c. phase of the signal
d. (A) and (b)
36. Which is similar to postal system where every message contains the complete destination
address and is mapped through the system, free of all the others
a. Connection-oriented services
b. Connectionless services
c. Both a & b
d. None of these
The various types of services provided by the interface to the layers above them are listed as
follows
a. Connection-oriented services
b. Connectionless services
c. Both a & b
d. None of these
39. When a propagation speed is multiplied by propagation time, we get the --------a.
throughput
b. wavelength of signal
c. distortion
d. distance a signal or bit has traveled
40. 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
41. Which agency developed standards for physical connection interfaces and electronic
signaling specifications?
a. ISO
b. ITU-T
c. ANSI
d. EIA
42. The _______ is the physical path over which a message travels.
a. Protocol
b. Signal
c. Medium
d. All the above
43. 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 equals P1
b. P2 is zero
c. P2 is much larger than P1
d. P2 is much smaller than P1
44. The _________ product defines the number of bits that can fill the link.
a. delay-amplitude
b. frequency-amplitude
c. bandwidth-period
d. bandwidth-delay
45.Before data can be transmitted, they must be transformed to ________.
A) periodic signals
B) electromagnetic signals
C) aperiodic signals
D) low-frequency sine waves
46. For a ______ channel, we need to use the Shannon capacity to find the maximum bit rate.
a. noiseless
b. noisy
c. low-pass
d. bandpass
47. What is the bandwidth of a signal that ranges from 1 MHz to 4 MHz?
a. 1 KHz
b. 3 MHz
c. 4 MHz
d. none of the above
48. ________ is a type of transmission impairment in which an outside source such as crosstalk
corrupts a signal.
a. Noise
b. Distortion
c. Attenuation
d. Decibel
49. The black and white Tv is an example of----------------a. non periodic composite signal
b. periodic composite signal
c. periodic composite signal
d. non periodic composite signal
50. Increase the level of a signal reduce the------a. reliability of the signal
b. efficiency of the signal
c speed of system
51. If the signal does not change at all, its frequency is
a. zero
b. maximum
c. infinite
d. high
52. we send a voice signal from microphone to a recorder, the transmission is
a. baseband transmission
b. broad band transmission
c. authenticated
d. broadcast
53. The unit that is used to express the state of the signal is
a. Kilogram
b. Second
c. Decibel
d. Hertz
54. Bit rate measure in---a. Bit per hertz
b. Bit per second
c. Nano second
d. Pixel per second
55. Conversion of the digital to analog signal is
a. Modulation
b. Demodulation
c. Encapsulation
d. Bypass
56. A sine wave is defined by
a. amplitude
b. frequency
c. phase
d. All of the above
57. The completion of one full pattern in signal is known as
a. period
b. cycle
c. frame
d. segment
58. Bit rate is the number of bits sent in
a. 1 sec
b. 2sec
c. 10 sec
d. 100 sec