Data Communication
Networking-II
Multiple
Choice Question & Answers:-
1.There are
______________ Internet service providers.
A) regional
B) local
C) national and international
D) all of the above
2. ______ refers to
the physical or logical arrangement of a network.
A)
Topology
B) Mode of operation
C) Data flow
D) None of the above
3. A ______ is a
data communication system spanning states, countries, or the whole world.
A) MAN
B) WAN
C) LAN
D) none of the above
4. A _______
connection provides a dedicated link between two devices.
A) primary
B) multipoint
C) point-to-point
D) secondary
5. Which topology
requires a multipoint connection?
A) Bus
B) Star
C) Mesh
D) Ring
6. A ________ is a
set of rules that governs data communication.
A) protocol
B) forum
C) standard
D) none of the above
7. In a ______
connection, two and only two devices are connected by a dedicated link.
A) multipoint
B) point-to-point
C) (a) and (b)
D) none of the above
8. The information
to be communicated in a data communications system is the _______.
A) Medium
B) Protocol
C) Message
D) Transmission
9. ________ defines
how a particular pattern to be interpreted, and what action is to be taken
based on that interpretation.
A) Syntax
B) Semantics
C) Timing
D) None of the above
10. 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
11. A television
broadcast is an example of _______ transmission.
A) half-duplex
B) simplex
C) full-duplex
D) automatic
12. Data flow
between two devices can occur in a _______ way.
A) simplex
B) half-duplex
C) full-duplex
D) all of the above
13. _______ are
special-interest groups that quickly test, evaluate, and standardize new
technologies.
A) Standards organizations
B) Regulatory agencies
C) Forums
D) All of the above
14. Which agency
developed standards for physical connection interfaces and electronic signaling
specifications?
A) ISO
B) ITU-T
C) ANSI
D) EIA
15. A _______ is a
data communication system within a building, plant, or campus, or between
nearby buildings.
A) LAN
B) MAN
C) WAN
D) none of the above
16. _______ refers
to two characteristics: when data should be sent and how fast it can be sent.
A) Semantics
B) Timing
C) Syntax
D) none of the above
17. This was the
first network.
A) CSNET
B) NSFNET
C) ARPANET
D) ANSNET
18. Devices may be
arranged in a _____ topology.
A) mesh
B) ring
C) bus
D) all of the above
19. _______ is the
protocol suite for the current Internet.
A) UNIX
B) NCP
C) TCP/IP
D) ACM
20. ________ is a
collection of many separate networks.
A) A WAN
B) An internet
C) A LAN
D) None of the above
21. In a ________
connection, three or more devices share a link.
A) point-to-point
B)
multipoint
C) (a) and (b)
D) none of the above
22. Which
organization has authority over interstate and international commerce in the
communications field?
A) FCC
B) IEEE
C) ITU-T
D) ISOC
23. In the original
ARPANET, _______ were directly connected together.
A) routers
B) host computers
C) networks
D)
IMPs
24. Communication
between a computer and a keyboard involves ______________ transmission.
A) simplex
B) half-duplex
C) full-duplex
D)
automatic
25. Which topology
requires a central controller or hub?
A) Mesh
B) Bus
C) Star
D) Ring
26. The _______ is
the physical path over which a message travels.
A) Protocol
B) Signal
C)
Medium
D) All the above
27. In a _______
connection, more than two devices can share a single link.
A)
multipoint
B) point-to-point
C) primary
D) secondary
28. _______ refers
to the structure or format of the data, meaning the order in which they are
presented.
A) Semantics
B) Syntax
C) Timing
D) All of the above
29. An unauthorized
user is a network _______ issue.
A) Security
B) Reliability
C) Performance
D) All the above
30. ________ is an
idea or concept that is a precursor to an Internet standard.
A) RCF
B) ID
C) RFC
D) none of the above
31. In _______
transmission, the channel capacity is shared by both communicating devices at
all times.
A) simplex
B) half-duplex
C) full-duplex
D) half-simplex
25. The TCP/IP
_______ layer is equivalent to the combined session, presentation, and
application layers of the OSI model.
A)
data link
B)
network
C)
physical
D) application
26. When a host on
network A sends a message to a host on network B, which address does the router
look at?
A)
logical
B)
physical
C)
port
D)
none of the above
27. As the data
packet moves from the upper to the lower layers, headers are _______.
A)
Rearranged
B)
Removed
C)
Added
D)
Modified
28. The physical
layer is concerned with the movement of _______ over the physical medium.
A)
dialogs
B)
protocols
C)
bits
D)
programs
29. To deliver a
message to the correct application program running on a host, the _______
address must be consulted.
A)
physical
B)
port
C)
IP
D)
none of the above
30. Ethernet uses a
______ physical address that is imprinted on the network interface card (NIC).
A)
32-bit
B)
6-byte
C)
64-bit
D)
none of the above
31. The _______
layer is the layer closest to the transmission medium.
A) Network
B)
Transport
C)
Physical
D)
Data link
32. The OSI model
consists of _______ layers.
A)
eight
B)
seven
C)
five
D)
three
33. The ________
address, also known as the link address, is the address of a node as defined by
its LAN or WAN.
A)
IP
B)
port
C)
specific
D)
physical
34. Layer 2 lies
between the physical layer and the _______ layer.
A)
Data link
B)
Transport
C)
Network
D)
None of the above
35. Why was the OSI
model developed?
A)
The rate of data transfer was increasing exponentially
B)
Standards were needed to allow any two systems to communicate
C)
Manufacturers disliked the TCP/IP protocol suite.
D)
None of the above
36. In the OSI
model, as a data packet moves from the lower to the upper layers, headers are
_______.
A)
removed
B)
added
C)
rearranged
D)
modified
37. 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)
session
B)
physical
C)
transport
D)
presentation
38. The seven-layer
_____ model provides guidelines for the development of universally compatible
networking protocols.
A) ISO
B) OSI
C)
IEEE
D)
none of the above
39. The Internet
model consists of _______ layers.
A)
Eight
B)
Seven
C)
Five
D)
Three
40. In the OSI
model, what is the main function of the transport layer?
A) process-to-process message delivery
B)
node-to-node delivery
C)
synchronization
D)
updating and maintenance of routing tables
41. _______ is a
process-to-process protocol that adds only port addresses, checksum error
control, and length information to the data from the upper layer.
A)
IP
B)
TCP
C)
UDP
D)
none of the above
42. The ______ layer
establishes, maintains, and synchronizes the interactions between communicating
devices.
A)
session
B) physical
C)
transport
D)
network
43. A port address
in TCP/IP is ______ bits long.
A)
16
B)
32
C)
48
D)
none of the above
44. In the OSI
model, encryption and decryption are functions of the ________ layer.
A) application
B)
presentation
C)
session
D)
transport
45. TCP/IP is a
______ hierarchical protocol suite developed ____ the OSI model.
A)
five-layer; before
B)
six-layer; before
C)
seven-layer; before
D) five-layer;
after
46. The ________
address, also known as the link address, is the address of a node as defined by
its LAN or WAN.
A)
logical
B)
port
C)
physical
D)
none of the above
47. The _______
model shows how the network functions of a computer ought to be organized.
A)
ANSI
B)
CCITT
C)
ISO
D) OSI
48. The _______
layer ensures interoperability between communicating devices through
transformation of data into a mutually agreed upon format.
A) network
B)
presentation
C)
transport
D)
data link
48. The _______
technique uses M different carrier frequencies that are modulated by the source
signal. At one moment, the sign modulates one carrier frequency; at the next
moment, the signal modulates another carrier frequency.
A)
DSSS
B)
FHSS
C)
FDM
D)
TDM
49. In synchronous
TDM, for n signal sources of the same data rate, each frame contains _______
slots.
A)
n + 1
B)
n - 1
C)
0 to n
D) n
50. Which
multiplexing technique transmits digital signals?
A)
WDM
B)
FDM
C) TDM
D)
None of the above
51. The sharing of a
medium and its link by two or more devices is called _______.
A)
modulation
B)
multiplexing
C)
encoding
D)
line discipline
52. _______ is
designed to be used in wireless applications in which stations must be able to
share the medium without interception by an eavesdropper and without being
subject to jamming from a malicious intruder.
A)
Multiplexing
B)
Spread spectrum
C)
Modulation
D)
None of the above.
53. ______ is an
analog multiplexing technique to combine optical signals.
A) WDM
B)
FDM
C)
TDM
D)
None of the above
54. FDM is an
_________technique.
A)
digital
B)
analog
C)
either (a) or (b)
D)
none of the above
55. ______ can be
applied when the bandwidth of a link (in hertz) is greater than the combined
bandwidths of the signals to be transmitted.
A)
TDM
B) FDM
C)
Both (a) or (b)
D)
Neither (a) or (b)
56. In TDM, the
transmission rate of the multiplexed path is usually _______ the sum of the
transmission rates of the signal sources.
A)
equal to
B) less
than
C)
greater than
D)
not related to
57. In a multiplexed
system, __ lines share the bandwidth of ____ link.
A)
1; n
B) n;
1
C)
1; 1
D)
n; n
58. _________
utilization is the use of available bandwidth to achieve specific goals.
A)
Amplitude
B)
Frequency
C)
Bandwidth
D)
None of the above
59. ____ is designed
to use the high bandwidth capability of fiber-optic cable.
A) WDM
B)
FDM
C)
TDM
D)
None of the above
60. We can divide
____ into two different schemes: synchronous or statistical.
A)
WDM
B)
TDM
C)
FDM
D)
none of the above
61. In ________ TDM,
each input connection has an allotment in the output even if it is not sending
data.
A)
isochronous
B)
statistical
C)
synchronous
D)
none of the above
62. In ________ TDM,
slots are dynamically allocated to improve bandwidth efficiency.
A)
isochronous
B)
synchronous
C)
statistical
D)
none of the above
63. The word ______
refers to the portion of a _______ that carries a transmission.
A)
line; channel
B)
channel; link
C)
link; channel
D)
line; link
64. Which
multiplexing technique shifts each signal to a different carrier frequency?
A) FDM
B)
TDM
C)
Both (a) and (b)
D)
None of the above
65. Which
multiplexing technique transmits analog signals?
A)
WDM
B)
TDM
C) FDM
D) (a)
and (c)
66. ________ is the
set of techniques that allows the simultaneous transmission of multiple signals
across a single data link.
A)
Demodulating
B)
Multiplexing
C)
Compressing
D)
None of the above
67. ________ can be
achieved by using multiplexing; ______ can be achieved by using spreading.
A)
Privacy and antijamming; efficiency
B)
Privacy and efficiency; antijamming
C)
Efficiency; privacy and antijamming
D)
Efficiency and antijamming; privacy
68. The ______
technique expands the bandwidth of a signal by replacing each data bit with n
bits.
A)
DSSS
B)
FHSS
C)
FDM
D)
TDM
69. ________ is a
digital process that allows several connections to share the high bandwidth of
a link.
A)
WDM
B)
TDM
C)
FDM
D)
None of the above
70. _______ is a
digital multiplexing technique for combining several low-rate channels into one
high-rate one.
A)
WDM
B) TDM
C)
FDM
D)
None of the above
71. In ________, we
combine signals from different sources to fit into a larger bandwidth.
A)
line coding
B)
block coding
C)
spread spectrum
D)
none of the above
72. Which
multiplexing technique involves signals composed of light beams?
A) WDM
B)
FDM
C)
TDM
D)
none of the above
73. When the angle
of incidence is _______ the critical angle, the light beam bends along the
interface.
A)
less than
B)
equal to
C)
more than
D)
none of the above
74. Transmission
media lie below the _______ layer.
A)
application
B)
transport
C)
network
D)
physical
75. _________ cable
consists of an inner copper core and a second conducting outer sheath.
A)
Twisted-pair
B)
Shielded twisted-pair
C)
Coaxial
D)
Fiber-optic
76. __________
consists of a central conductor and a shield.
A)
Twisted-pair
B)
Coaxial
C)
Fiber-optic
D)
none of the above
77. _______ cable
can carry signals of higher frequency ranges than _______ cable.
A)
Coaxial; twisted-pair
B)
Twisted-pair; fiber-optic
C)
Coaxial; fiber-optic
D)
none of the above
78. _________ are
used for cellular phone, satellite, and wireless LAN communications.
A)
Radio waves
B)
Infrared waves
C)
Microwaves
D)
none of the above
79. The inner core
of an optical fiber is _______ in composition.
A)
copper
B)
glass or plastic
C)
bimetallic
D)
liquid
80. What is the
major factor that makes coaxial cable less susceptible to noise than twisted-pair
cable?
A)
insulating material
B)
inner conductor
C)
diameter of cable
D)
outer conductor
81. Signals with a
frequency below 2 MHz use _______ propagation.
A)
line-of-sight
B)
sky
C)
ground
D) none
of the above
82. In an optical
fiber, the inner core is _______ the cladding.
A)
less dense than
B)
denser than
C)
the same density as
D)
another name for
83. ________ cable
consists of two insulated copper wires twisted together.
A)
Twisted-pair
B)
Coaxial
C)
Fiber-optic
D)
none of the above
84. In fiber optics,
the signal is _______ waves.
A)
radio
B)
light
C)
infrared
D)
very low-frequency
85. Signals with a
frequency above 30 MHz use _______propagation.
A)
line-of-sight
B)
sky
C)
ground
D)
none of the above
86. A parabolic dish
antenna is a(n) _______ antenna.
A)
unidirectional
B)
bidirectional
C) omnidirectional
D)
horn
87. A(n) _______
medium provides a physical conduit from one device to another.
A)
unguided
B)
guided
C)
either (a) or (b)
D)
none of the above
88. ________ cable
is used for voice and data communications.
A)
Twisted-pair
B)
Coaxial
C)
Fiber-optic
D)
none of the above
89. Signals with a
frequency between 2 MHz and 30 MHz use _______ propagation.
A)
ground
B)
line-of-sight
C) sky
D)
none of the above
90. Transmission
media are usually categorized as _______.
A)
determinate or indeterminate
B)
fixed or unfixed
C)
guided or unguided
D)
metallic or nonmetallic
91. ________ are
used for short-range communications such as those between a PC and a peripheral
device.
A)
Radio waves
B)
Infrared waves
C)
Microwaves
D)
none of the above
92. _________ media
transport electromagnetic waves without the use of a physical conductor.
A)
Guided
B) Unguided
C)
Either (a) or (b)
D)
None of the above
93. ________ cables
are composed of a glass or plastic inner core surrounded by cladding, all
encased in an outside jacket.
A)
Twisted-pair
B)
Coaxial
C)
Fiber-optic
D) none of the above
94. Which of the
following primarily uses guided media?
A)
radio broadcasting
B)
satellite communications
C)
local telephone system
D)
cellular telephone system
95. When a beam of
light travels through media of two different densities, if the angle of
incidence is greater than the critical angle, _______ occurs.
A)
refraction
B)
reflection
C)
criticism
D)
incidence
96. Which of the
following is not a guided medium?
A) fiber-optic
cable
B)
coaxial cable
C)
twisted-pair cable
D)
atmosphere
97. Microwaves are
_________.
A)
omnidirectional
B)
bidirectional
C)
unidirectional
D)
none of the above
98. ________ cables
carry data signals in the form of light.
A)
Twisted-pair
B)
Coaxial
c)
none of the above
99. Radio waves are
_________.
A)
unidirectional
B)
omnidirectional
C)
bidirectional
D)
none of the above
100. In a
fiber-optic cable, the signal is propagated along the inner core by _______.
A)
refraction
B)
reflection
C)
modulation
D)
none of the above
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