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THAKRAL COLLEGE OF TECHNOLOGY
DEPARTMENT OR MCA
OBJECTIVE TYPE QUESTION
COMPUTER NETWORK
Connectivity is a concept related to
A.
transmitting information, either by computer or by phone
B.
the interconnections within a computer
C.
using computer networks to link people and resources
D.
being in an active session with your computer
One of the most dramatic changes in connectivity and communications in the past five
years or so has been ____.
A.
mobile or wireless telephones
B.
public and private discussion
C.
satellite uplinks
D.
running programs on remote computers
The four basic elements of any communication system include
A. peer-to-peer, videoconferencing, online photo-conferencing, net optical
B. sending and receiving devices, communication channel, connection device, and
data transmission specifications
C. telephone lines, coaxial cables, fiber-optics cables, and communication channel
D. software, hardware, communication channel, network
These communication devices originate as well as accept messages in the form of data,
information, and/or instructions.
A.
i-drives
B.
sending and receiving devices
C.
key chain drives
D.
optical drives
The transmission medium that carries the message is referred to as the
A.
send and receive device
B.
communication channel
C.
protocol
D. Gateways
Data is transmitted using light through a ____ cable.
A.
twisted pair
B.
fiber-optic
C.
coaxial
D.
microwave
Which physical connection is the fastest?
A.
twisted pair
B.
coaxial cable
C.
fiber-optics
D.
microwaves
Which of the following connection methods would not be used to connect devices
between two different offices?
A.
twisted pairs
B.
fiber-optics
C.
coaxial cables
D.
Infrared
9. Most Web-enabled devices follow a standard known as
A.
FireWire
B.
Bluetooth
C.
TCP/IP
D.
Wi-FI
10. This wireless standard is widely used to connect computers to each other and to the
Internet.
A.
802.11
B.
RJ45
C.
Blueband
D.
Broadband
11. Bluetooth is a type of radio wave information transmission system that is good for about
A.
30 feet
B.
30 yards
C.
30 miles
D.
300 miles
12. A term relating to sending data to a satellite is
A.
uplink
B.
downlink
C.
modulate
D.
demodulate
13. A credit card-sized expansion board that is inserted into portable computers that
connects the PC to the telephone wall jack is called what?
A.
Internal modem
B.
External modem
C.
PC Card modem
D.
Wireless modem
14. Standard telephone lines and conventional modems provide what is called
A.
Bluetooth service
B.
dial-up service
C.
wireless service
D.
WiFI service
15. Special high-speed lines used by large corporations to support digital communications
are known as
A.
satellite/air connection service lines
B.
cable modems
C.
digital subscriber lines
D.
T1, T2, T3 and T4 lines
16. The rules for exchanging data between computers are called
A.
interconnections
B.
synchronous packages
C.
protocols
D.
data transmission synchronization
17. Each computer on the Internet has a unique numeric address called a(n)
A.
domain address
B.
protocol address
C.
IP address
D.
Web address
18. ____ is the process of breaking down information sent or transmitted across the Internet
into small parts called packets.
A.
protocol
B.
bandwidth
C.
reformatting
D.
identification
19. Two or more computers connected so that they can communicate with each other and
share information is called a
A.
satellite
B.
protocol
C.
broadcast
D.
network
20. Any device that is connected to a network is called a
A.
client
B.
node
C.
server
D.
manager
21. Which of the following elements does a Peer-to-Peer network require?
A. Workstations
B. Fileserver
C. Network interface cards
22. A company wishes to connect two sites in different parts of the country together. It is
decided to use the telephone system. What device should be connected to the fileservers
on each site?
A. Router
B. Modem
C. CD-ROM
23. What is a Local Area Network (LAN)?
A. Network within a building or site
B. Network across a city, country or even the world
C. Network that contains servers across the world
24. What is a file server?
A. A computer that performs a service for other computers
B. A computer that controls the printers on the network
C. A computer that stores files that are created by network users
25. Describe the function of the hub at the centre of a star network.
A. Device to store information temporarily then send it out to another destination on
the network
B. Hardware device which will enable any printer to be connected to the network
C. A central location for the attachment of cabling from a number of PCs
26. What is the main function of a Network Protocol?
A. A Protocol connects different physical network types together
B. A language that computers use to communicate with other computers
C. A Protocol speeds up the connection between computers
27. What is the Protocol used for the Internet?
A. IPX/SPX
B. NetBIOS/NetBEUI
C. TCP/IP
28. A network that provides a constant bandwidth for the complete duration of a message
transfer is a:
A. cell switched network.
B. packet switched network.
C. circuit switched network
29. Telephone systems may be classified as:
A.
B.
C.
D.
30.
simplex and asymmetrical.
duplex and asymmetrical
simplex and symmetrical.
duplex and symmetrical.
A network that provides a constant bandwidth for the complete duration of a message
transfer is a:
A. packet switched network.
B. cell switched network.
C. circuit switched network.
31. router:
A. determines on which outgoing link a packet is to be forwarded.
B. forwards a packet to the next free outgoing link.
C. forwards a packet to all outgoing links.
D. none of the above
32. The Internet is an example of a:
A. packet switched network.
B. circuit switched network.
C. cell switched network.
D. None of the above.
33. Flow control is done by
A. Application layer
B. Transport layer
C. Data link layer
D. A & C
E. B & C
34. Route determination is done by
A. Application layer
B. Transport layer
C. Data link layer
D. Network layer
35.
Interface to transmission media is on
A.
B.
C.
D.
Application layer
Physical layer
Data link layer
B&C
36.
First step of PCM is
A. Quantization
B. Sampling
C. Line Coding
D. None of the above
37.
2Hlog2V is the formula, to find
A. Maximum datarate on noisy channel
B. Maximum datarate on noisy free channel
C. Maximum samplerate on noisy channel
D. Maximum datarate on noisy free channel
38.
The device used in a data communication network to perform the conversion
between analogue and digital signals, is called a …
a. front end processor.
b. modem.
c. decoder.
d. multiplexer.
The Internet is ...
a. a global network of computers networks.
b. a government-owned agency that links computers.
c. software for sending e-mail around the world.
d. a specialised form of local area network.
39.
40.
ATM breaks all traffic into 53-Byte cells because
A.53-Byte cells are the ideal size for the voice communication
B.53-Byte cells are the ideal size for data communication
C.53-Byte cells are the ideal size for circuit switching
D.53-Byte cells are the compromised size for both voice and data communication
41.What gives ATM network the ability to operate at different data rates and why?
A.Its short,fixed length cells:Allows the prediction of the size of buffers to be used.
B.Its short,fixed length cells:Enables the cells to be transported via different routes.
C.Its short,fixed length cells:Short delays for voice traffic.
D.it's short,5-Byte header:Less delay for routing the cells.
42. Why is ATM the goal for future networking?
A.It is efficient for data transfer.
B.It's the only technology suitable for transmission of digital television.
C.It allows the integration of voice,data and video into one network.
D.It creates an error free network.
43. Why is Frame Relay's throughput lower than that of ATM?
A.Frame Relaying have error control(ARQ) functionality but not ATM.
B.ATM does not need to have CRC checking/generation or bit stuffings functionality in
the packets as in Frame Relay.
C.Frame Relaying needs to do multiplexing of logical channels but not ATM.
D.Although both Frame relay and ATM have frame boundary recognition(flags) ,ATM
dosen't have bit stuffing as in frame Relaying.
44. Which of the following is done in the physical layer of the ATM network?
A. Cell multiplexing and demultiplexing
B. Generic flow control
C. Transmission frame generation/recovery
D. Monitoring of the user information field for bit errors and possible corrective actions
45. ATM is said to be a connection oriented technology.What does this mean and why is it
necessary?
A. Cells travels through the same path to the receiver. By This, cell do not have to be
rearranged.
B. Cells travels through different paths. Therefore cells can reach the receiver faster.
C. A path is reserved exclusively for one user. Arrangement of cells is not necessary
D. Cells are transmitted using fibre optic cables. Cells would be less susceptible to errors.
46. Which of the following is not the function of the AAL?
A. Cell header generation.
B. Handling of lost and misinserted cell.
C. Handling of cell delay variation.
D. Segmentation and reassembly of user information.
47. Which of the following is not the benifit of an ATM LAN ?
A. Better performance concerning with delays.
B. Very high aggeregate throughput
C. Interconnecting existing LANs
D. Simpler control
48. What advantage does ATM have over STM ?
A. Unlike ATM, time slots provided by STM for a particular user cannot be grabbed by
another user.
B. It is cheaper to implement.
C.ATM is suitable for real time traffic but not ATM
D. Time slots for STM occurs at regular intervals.
49. Which of the following is not true about the difference of B-ISDN as compared to ISDN?
A.B-ISDN provides for communication services with very high bit rate requirements such
as digital television
B.B-ISDN uses optical fibre cable whereas ISDN makes us of the existing infrastructure.
C.B-ISDN uses only packet switching whereas ISDN does not perform packet switching.
D. The bit rate for ISDN is prespecified unlike B-ISDN
50. Light is confined within the core of a simple optical fiber by
A. refraction.
B. total internal reflection at the outer edge of the cladding.
C. total internal reflection at the core cladding boundary.
D. reflection from the fiber's plastic coating.
51. What makes optical fibers immune to EMI?
A. They transmit signals in as light rather than electric current.
B. They are too small for magnetic fields to introduce current in them.
C. Magnetic fields cannot penetrate the glass of the fiber.
D. They are readily sheilded by outer conductors in cable.
52. Which of the following is not a reason to use fiber-optic cables for point to point data
transmission?
A. Need to assure data security.
B. Avoidance of ground loops.
C. Data-transfer rates too low to use metal cables.
D. Elimination of spark hazards.
53. Which of the following describes a technique to achieve fault tolerance in optical networks
with minimum costs?
A. Bypassing active elements.
B. Avoid the usage of star couplers..
C. Duplication of system properties.
D. Topological reconfiguration.
54. When would optical fibers be used in an Ethernet-type LAN?
A. Never, the standard calls for coaxial cable.
B. To extend transmission distance to reach remote terminals.
C. Routinely, the standard allows for optical fiber.
D. When transmission speeds exeed 50 Mbit/s.
55. What are the advantages of using parallel optical fiber interconnections within board-toboard or frame-to-frame connections in computer systems?
A. No bandwidth limit.
B. Space saving.
C. Avoids electrical crosstalk.
D. All of the above.
56. What technological progress has allowed the full usage of fiber optics within parallel
computer architechture?
I. There are compilers and programming that recognise and exploit parallelism.
II. Widely tunable semiconductor lasers allow maultiple wavelength system.
III. Newly designed operating system for parallel processing.
IV. Migration of architectural features previously found on mainframes onto single-chip
microprocessors.
A. I and III only.
B. II, III and IV only.
C. I, II and IV only.
D. I, II, III and IV.
57. Which of the following is NOT a reason to use flexible optical circuits?
A. Low loss distribution.
B. Protection of fiber.
C. Small size.
D. Compact and bend easily.
58. The Fiber Distributed Data Interface (FDDI) standard calls for nodes to be:
A. attached to a data bus in the form of a transmissive star coupler.
B. attached to a pair of fiber rings carrying signals in opposite directions.
C. attached to a network of star couplers that detect collisions and transmit only one
signal to the next level.
D. attached to fibers by passive T couplers.
59. The type of light source and fiber chosen for FDDI networks are:
A. single-mode fiber and 1550-nm lasers.
B. single-mode fiber and 1300-nm lasers.
C. multi-mode fiber and 1300-nm lasers.
D. multi-mode fiber and 1300-nm LEDs.
60. Which of the following happen to be the limitations of optical fiber ?
I. The architecture of their couplers.
II. Costs of implementing them.
III. Modification of the software and hardware on existing systems.
IV. The difficulty of installing the cables.
A. II and IV only.
B. I,II and III only.
C. I,III and IV only.
D. I,II,III and IV.
61. Speeds of laboratory fiber optic Local Area Networks are now in the range of
A. 1 Mbits/s.
B. 10 Mbits/s.
C. gigabits per second.
D. hundreds of megabits per second.
62. Which of the following is NOT true about digital signals used in fiber optic transmissions ?
A. It's more compatible with people.
B. It's much simpler to design a circuit to detect the signal level.
C. There's less distortion in the signals as it goes through a system.
D. Isn't difficult to differentiate the on from off state even if the signal is not reproduced
exactly.
63. What method allows large number of independent, selectable channels to exist on a single
fiber?
A. Frequency Division Multiplexing.
B. Time Division Multiplexing.
C. Analague Modulation.
D. Phase Modulation.
64. Which of the following statement about interconnection networks is true?
A. The number of channels on a single fiber that can transmit data simultaneously refers to
the degree of simultaneity.
B. Degree is the number of channels on a single fiber.
C. Point-to-point communication connections are called switches.
D. Diameter is the number of links in the largest path between any two nodes.
65. What type of optical fiber would best be used in the Multiple Channel Architechture (MCA)?
A. Refractive-Index.
B. Step-Index.
C. Graded-Index.
D. None of the above.
66. data link between the head office of a financial organization and one of its branches runs
continuously at 2.048 Mbps. Between the hours of 0900 and 1700 it is noted that there are
295 bits received in error. Determine the bit error rate.
A. 2 x 10-7
B. 2 x 10-10
C. 5 x 10-9
D. 5 x 10-8
67. A file is downloaded to a home computer using a 56 kbps modem connected to an Internet
Service Provider. If the download completes in 2 minutes, estimate the maximum size of
data downloaded.
A. 6.72 Mbit.
B. 26.88 Mbit.
C. 13.44 Mbit.
D. 336 Kbit.
68. Baseband transmission may be defined as the transmission of a signal over a link:
A. without any change in frequency.
B. which is relatively short.
C. by means of wires.
D. at a different band of frequencies.
69. Skin effect may be described as:
(Note: more than one answer is correct.)
A. conduction restricted to the outer layer of a conductor.
B. conduction restricted to a small central region of a conductor.
C. a thin layer of electricity.
D. conduction of electricity through skin.
70. A block of data consisting of 2048 bits is transmitted between two computers interconnected
by 450 m of twisted-pair wire. If the transmission rate is 34 kbps determine a, the ratio of
propagation delay to transmission delay.
A. 3.76 x 10-3
B. 37.6 x 10-6
C. 376 x 10-6
D. 376 x 10-6
71. Asynchronous transmission may be defined as:
A. communication where the receiver clock must be in exact synchronism with that of the
transmitter.
B. communication where receiver will operate satisfactorily, even if its clock frequency is
appreciably different to that of the transmitter.
C. communication where the receiver clock must be in approximate synchronism with that of
the transmitter.
D. communication where the receiver clock must be in exact synchronism with that of the
transmitter.
72. Synchronous transmission may be defined as:
A. communication where the receiver will operate satisfactorily, even if its clock frequency is
appreciably different to that of the transmitter.
B. communication where the receiver clock must be in approximate synchronism with that of
the transmitter.
C. communication where the receiver clock is arranged to be in exact synchronism with that
of the receiver.
D. None of the above
73. manchester encoding is principally designed to:
A. increase the bandwidth of a signal transmitted on the medium.
B. have more than one symbol per bit period.
C. ensure that the line remains unbalanced.
D. ensure that a transition occurs in the centre of each bit period.
74. Is the following statement true of the Go-back-N error control strategy?
A transmitter may send up to N packets before it receives an acknowledgment.
A. True
B. False
75. A protocol data unit (PDU) is exchanged between the same layer in two separate protocol
stacks. It comprises the PDU passed from the layer immediately above and its own protocol
control information.
A. True
B. False
76. Protocols are
A. Agreements on how communications componets and DTE’s are to communicate
B. Logical communication channels used for transferring data
C. Physical communication channels used for transferring data
D. None of the above
77. The method of communication in which transmission takes place in both directions, but only in
one direction at a time, is called
A. Simplex
B. Four wire circuit
C. Full duplex
D. Half duplex
78. Error detection at the data link level is achieved by
A. Bit Stuffing
B. Cyclic Redundency Check
C. Hamming codes
D. Equalization
79. The topology with highest reliability is
A. Bus
B. star
C. Ring
D. Mesh
80. Buad means
A. The number of bits transmitted per unit time
B. The number of bytes transmitted per unit time
C. The rate at which the signal changes
D. None of the above
81. Start and stop bits are used in serial communication for
A. Error detection
B. Error correction
C. Synchronization D. Slowing down the communication
82. Unmodulated signal coming from a transmitter is known as
A. Carrier Signal
B. Baseband Signal
C. Primary signal
83. Manchester encoding is
A. Bi-polar encoding
C. Polar encoding
D. none of the above
B. NRZ encoding
D. none of the above
84. How you can Find the maximum data rate of a noiseless 4-kHz channel-using Analog
encoding eg QPSK with 2 bits per sample?
A. 24 kbps B. 16 Kbps
C. 24000 kbps
D. 16000 kbps
85. HDLC is
A. Bit Oriented
B. code transparent
C. Code dependent
D. none of the above
86. Bit stuffing refers to
A. Inserting a ‘0’ in user data stream to differentiate it with a flag.
B. Inserting a ‘0’ in flag stream to avoid ambiguity
C. Appending a nibble to the flag sequence
D. Appending a nibble to the user data stream
87. In Ethernet CSMA/CD, the special bit sequence transmitted by media access management
for collision handling is called
A. preamble
B. Postamble
C. Jam
D. None of the above
88. For a channel, with the Bandwidth of H hertz, and signal to nise ratio as S/N db, the channel
capacity is limited by,
A. H log2(1+(S/N))
B. (H/2) log2(1+(S/N))
(1+(S/N))
C. 2H log2
D. None of the above
89. Amplitude shift keying is not used in modems because it is,
A. Higly effected by the noise
B. Using only between on and off states.
C. Applicable for amplitute modem only
D. None of the above
90. which out of the following types of signal reqire the highest bandwidth for transmission
A. Speech
B. Video
C. Music
D. Sound.
91. When sampling rate is less than the twice its maximum frequency, the error caused is known
as:
A. Aliasing
B. Phase jittering
C. Quantization.
D. None of the above.
92. Frequency division Multiplexing technique will be better than TDM in multiplexing digital
signals having variable data rates.
A. True
B. False.
93. The Media Access Control sublayer resides in which OSI layer
A. transport B. Network
C. Physical
D. Data Link
94. Which protocol is a Network layer protol
A. IPX
b. Telnet
C. FTP
D. None of the above.
95. The downlink and uplink channels of a satellite are separated
A. in time
B. in frequency C. in space
D. Not separated.
96. QAM is
A. PSK combined with AM
B. ASK combined with AM
C. FSK combined with AM
D. QPSK combined with AM
97. In a telephone channel, voice signals are band limited to :
A. 1 kHz.
B. 3.4 kHz
C. 8 kHz
D. 20 kHz.
98. Which is the following is NOT an example of standard of the Data Link Layer:
A. HDLC
B. ADCCP
C. TCP D. none of the above
99. Which of the following cabling techniques is considered best between buildings for
establishing LANs?
A. 10Base5 B. 10Base-F
C. 10Base2
D. none of the above.
100. For optical fiber used in point to point transmission, the repeater spacing is
A. 10-100 km
B. 2-10 km
C. 1-10 km
D. none
ANSWER
1.
6.
11.
16.
21.
26.
31.
36.
41.
46.
51.
56.
61.
66.
71.
76.
81.
86.
91.
96.
C
B
A
C
C
A
A
B
A
A
A
C
D
C
C
A
C
A
A
A
2.
7.
12.
17.
22.
27.
32.
37.
42.
47.
52.
57.
62.
67.
72.
77.
82.
87.
92.
97.
A
C
A
C
B
C
A
B
C
A
C
C
A
A
C
D
A
C
B
B
3.
8.
13.
18.
23.
28.
33.
38.
43.
48.
53.
58.
63.
68.
73.
78.
83.
88.
93.
98.
B
D
C
C
A
C
E
B
B
A
D
B
A
A
D
B
C
A
D
C
4.
9.
14.
19.
24.
29.
34.
39.
44.
49.
54.
59.
64.
69.
74.
79.
84.
89.
94.
99.
B
D
B
D
C
D
D
A
B
C
B
D
D
A
A
D
B
A
A
A
5. B
10. A
15. D
20. B
25. C
30. C
35. B
40. D
45. A
50. B
55. D
60. B
65. C
70. B
75. A
80. C
85. A
90. B
95. B
100. A