CS8591 Computer Networks
Unit I Introduction and Physical Layer
(Multiple Choice Questions (MCQ))
Networks – Network Types – Protocol Layering – TCP/IP Protocol suite – OSI
Model –
Physical Layer: Performance – Transmission Media - Switching
– Circuit-switched Networks – Packet Switching.
1. Data communication is
A. Exchange of data between two devices via
transmission medium
B. Visual Communication
C. Non Verbal Communication
D. None of the above
Ans. A
2. Which of the following is not the criteria
necessary for an effective and efficient network?
A. Excellence B. Performance C. Reliability D.
Security.
Ans. A
3. Performance of the network depends on
A. Number of users
B. Type of transmission medium
C. Capabilities of the connected hardware and
the efficiency of the software
D. All of the above
Ans. D
4. Reliability is measured by
A. Frequency of failure
B. Time it takes a link to recover from the failure
C. Network’s robustness in a catastrophe
D. All of the above
Ans. D
5. Security issues include
A. Protecting
data from unauthorized access and viruses.
B. state of feeling safe and being free from worry
C. Protection against difficulties
D. None of the above.
Ans. A
6. Fundamental characteristics that determine
the effectiveness of the data communication system are
A. Delivery:
B. Accuracy
C. Timeliness
D. All of the above
Ans. D
7. The advantages of distributed processing
are
A. Security/encapsulation
B. Distributed databases
C. Faster problem solving
D. All of the above
Ans. D
8. A protocol is
A. a set of rules that govern data
communication B. A Device C. A Network D. A Standard
Ans. A
9. Standards are
A. agreed upon rules
B. synonymous with rule
C. rules
D. None of the above
Ans. A
10. A Data
Communication System consists of
A. 2 components B. 3 Components C. 4
Components D. 5 Components
Ans. D
11. Communication
between two devices (Data flow/Transmission mode) can be
A. Simplex
B. Half-duplex
C. Full-duplex
D. All of the above
Ans. D
12. Simplex
Communication is
A. Unidirectional
B. Bidirectional at the same time
C. Bidirectional not at the same time
D. None of the above
Ans. A
13. Half Duplex
Communication is
A. Unidirectional
B. Bidirectional at the same time
C. Bidirectional not at the same time
D. None of the above
Ans. C
14. Duplex
Communication is
A. Unidirectional
B. Bidirectional at the same time
C. Bidirectional not at the same time
D. None of the above
Ans. B
15. A Computer Network is
A. A group of interconnected computers
B. System of roads
C. System of railway lines
D. All of the above
Ans. A
16. The need of computer
networks is
A. Allowing computers to communicate with each
other
B. Sharing resources
C. Sharing information
D. All of the above
Ans. D
17. Distributed processing is
A. A task is divided among multiple computers
B. Instead of one single large machine being responsible for all
aspects of process, separate computers handle a subset
C. use
of more than one processor to perform the processing for an individual task
D. All of the above
Ans. D
18. The amount of time
required for a message to travel from one device to another is
A.
Transit time B. Response time C. Waiting time D. Collision time
Ans. A
19.
The elapsed time between an inquiry and a response is
A.
Transit time B. Response time C. Waiting time D. Collision time
Ans. B
20.
Performance is often evaluated by the following networking metrics
A. Throughput
B. Delay C. Distance D. both (a) and (b)
Ans. D
21.
Physical communication pathway that transfers data from one device to another
is
A.
Link
B.
Data communication
C. Line
configuration
D. All
of the above
Ans. A
22. The way two or more communication devices
attach to a link is
A.
Link
B.
Data communication
C.
Line configuration
D. All
of the above
Ans. C
23. Topology is
A. The way a network is laid out physically
B. Link
C. Line Configuration
D. All of the above
Ans. A
24.
The following is not a topology.
A.
Mesh B. Star C. Ring D. Circle
Ans. D
25. In _______ topology, every device has a dedicated point-to-point
link to every other device.
A.
Mesh B. Star C. Ring D. Bus
Ans. A
26. In a _______ topology)
network with n nodes,
there are n x (n -1) /2
A.
Mesh B. Star C. Ring D. Bus
Ans. A
27. Advantages of Mesh topology are
A.
Mesh topology is robust
B.
Better privacy and security
C.
Failure of one link will not disturb other links & it helps the network
manager to find the fault location and solution
D. All
of the above
Ans. D
28. Disadvantages of Mesh topology are
A.
Large amount of cabling and I/O ports are required.
B.
Installation and reconnection are difficult.
C.
both (a) and (b)
D. None
of the above
Ans. C
29.
Assume five devices are arranged in a mesh topology. How many cables are
needed?
A. 8
B. 6 C. 10 D. 4
Ans. C
30.
Assume five devices are arranged in a mesh topology. How many ports are needed
for each device?
A. 8
B. 6 C. 10 D. 4
Ans. D
31. Topology in which every device has a
dedicated point-to-point link to a central controller (HUB) only is
A. Mesh B. Star C. Bus D. Ring
Ans. B
32. In a Star topology
network with n nodes,
there are direct ____ links;
A. n B.
n-1 C. n+1 D. n+2
Ans. A
33.
Assume five devices are arranged in a star topology. How many cables are
needed?
A. 5
B. 6 C. 10 D. 4
Ans. A
34. Advantages of Star topology are
A.
Star topology is robust and less expensive.
B.
Fault identification and fault isolation are easy.
C.
Modification of star network is easy.
D. All
of the above
Ans. D
35. Disadvantages of star topology are
A. If
the central hub fails, the whole network will not work.
B.
Communication is possible through the hub.
C.
both (a) and (b)
D. None
of the above
Ans. C
36. Topology in which one long cable acts
as a backbone to link all the devices in the network is
A. Mesh B. Star C. Bus D. Ring
Ans. C
37. Advantages of bus
topology are
A. Easy Installation.
B. Less cabling and less number of I/O ports
is required.
C. Less cost.
D. All of the above
Ans. D
38. Disadvantages of
bus topology are
A. Network traffic is high.
B. Fault isolation and reconnection is
difficult & Adding new device is difficult.
C. A break in the bus cable stops all
transmissions
D. All of the above
Ans. D
39.
Topology in which each device has a dedicated point-to-point link with only the
two devices on either side of it is
A. Mesh B. Star C. Bus D. Ring
Ans. D
40. In a Ring topology
network with n nodes,
there are direct ____ links;
A. n B.
n-1 C. n+1 D. n+2
Ans. A
41. In ___________
topology, the repeater is
used to regenerate the signals during transmission.
A. Mesh B. Star C. Bus D. Ring
Ans. D
42. Advantages of ring
topology are
A. Easy to install and reconfigure.
B. Link failure can be easily found out.
C. both (a) and (b)
D. None of the above
Ans. C
43. Disadvantages of
ring topology are
A. Maximum length of ring and number of
devices are limited.
B. Failure of one node on the ring affects the
entire network & Addition of nodes or removal of nodes disrupts the
network.
C. Signal traffic is unidirectional.
D. All of the above
Ans. D
44. A __________
topology is a type of network topology that uses two or more other network topologies.
A. Mesh B. Star C. Bus D. Hybrid
Ans. D
45. Categories of
Networks are
A.
Local Area Networks (LAN)
B.
Metropolitan Area Networks (MAN)
C.
Wide Area Networks (WAN)
D. All
of the above
Ans. D
46. A Network covering a limited physical area upto 10 km
(approximately) is
A.
Local Area Network (LAN)
B.
Metropolitan Area Network (MAN)
C.
Wide Area Network (WAN)
D. None
of the above
Ans. A
47. A Network covering a town or a city (10 km - 100 km
approximately) is
A.
Local Area Network (LAN)
B.
Metropolitan Area Network (MAN)
C.
Wide Area Network (WAN)
D. None
of the above
Ans. B
48. A Network covering a large geographical area (beyond 100 km)
often a country or continent or even whole world is
A.
Local Area Network (LAN)
B.
Metropolitan Area Network (MAN)
C.
Wide Area Network (WAN)
D. None
of the above
Ans. C
49.
The Internet is
A. Network
of networks B. Intranet C. Extranet D. All of the above
Ans. A
50. Which of the
following is/are true about Layering:
A.
technique for organizing the protocols into an ordered series of distinct
abstractions
B. It decomposes the problem of building a
network into more manageable components
C. It provides a more modular design
D. All of the above
Ans. D
51.
An OSI model is
A. Open
Systems Interconnection (OSI) Model
B. ISO
Standard
C. Layered
framework
D. All
of the above
Ans. D
52.
OSI Model consists of
A. 5
layers B. 7 layers C. 4 layers 5. 8 layers
Ans. B
53.
Network support layers include
A.
Physical layer
B.
Data Link Layer
C.
Network layer
D. All
of the above
Ans. D
54. User support layers include
A.
Session layer
B.
Presentation layer
C.
Application layer
D. All
of the above
Ans. D
55. Header is added to the data unit at which layer
A.
Physical layer B. Data Link layer C. Network layer D. All 7 layers
Ans. D
56. Trailer is added at which layer
A.
Physical layer B. Data Link layer C. Network layer D. Transport layer
Ans. B
57. Movements of individual bits from one hop (node) to the next
is the responsibility of which layer
A.
Physical Layer B. Data Link Layer C. Network layer D. Transport Layer
Ans. A
58. Moving frames from one hop (node) to the next is the
responsibility of which layer
A.
Physical Layer B. Data Link Layer C. Network layer D. Transport Layer
Ans. B
59. Delivery of
individual packets from the source host to the destination host is the
responsibility of which layer
A. Physical Layer B. Data Link Layer C.
Network layer D. Transport Layer
Ans. C
60. Delivery of a
message from one process to another is the responsibility of which layer
A. Physical Layer B. Data Link Layer C. Network
layer D. Transport Layer
Ans. D
61. Dialog control and
synchronization are the responsibilities of which layer
A. Physical Layer B. Data Link Layer C.
Session layer D. Transport Layer
Ans. C
62. Translation,
Compression and Encryption are the responsibilities of which layer
A. Physical Layer B. Data Link Layer C.
Session layer D. Presentation Layer
Ans. D
63. Providing services
to the user is the responsibility of which layer
A. Physical Layer B. Application Layer C.
Session layer D. Presentation Layer
Ans. B
64. Each layer of the
OSI model receives services or data from a ___ layer.
A. below layer
B. above layer
C. both (a) and (b)
D. None of the above
Ans. A
65. A layer of the OSI
model on one system communicates with the ___ layer of its peer system.
A. above
B. below
C. same
D. None
Ans. C
66. In an OSI model,
the lowest layer is the ________ layer.
A. Application Layer B. Physical Layer C. Presentation
Layer D. Data Link Layer
Ans. B
67. In the OSI model,
which is the highest layer?
A. Application Layer B. Physical Layer C. Presentation
Layer D. Network Layer
Ans. A
68. 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 targeting
certain layers is easy because the services to be offered are fixed.
D. All of the above
Ans. D
69. The layer that
transmits data in the form of bit streams using electrical and mechanical
systems is __________in the OSI model.
A. Physical layer
B. Data Link Layer
C. Network Layer
D. Transport Layer
Ans. A
70. 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
Ans.C
71. 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
Ans. B
72. The physical layer
is concerned with
A. Physical characteristics of the media
B. Representation of bits and synchronization
of bits
C. transmission rate and mode
D. All of the above
Ans. D
73. The data link
layer is responsible for
A. framing data bits
B. providing the physical addresses of the
sender/receiver `
C. data rate control and detection and
correction of damaged and lost frames
D. All of the above
Ans. D
74. The network layer
is responsible for
A. providing host-to-host addressing
B. routing
C. both (a) and (b)
D. None of the above
Ans. C
75. ____________ is a
unit of data that consists of a header, which is defined by the protocol in
use, followed by various application data.
A. Protocol Data Unit (PDU)
B. Packet Data Unit
C. either (a) or (b)
D. None of the above
Ans. A
76. A frame is
Protocol Data Unit (PDU) at the __________
layer.
A. physical B. data link C. network D.
transport
Ans. B
77. A packet is
Protocol Data Unit (PDU) at the _________ layer.
A. physical B. data link C. network D.
transport
Ans. C
78. The transport
layer is responsible for
A. dividing the message into manageable
segments
B. reassembling it at the destination
C. flow and error control
D. All of the above
Ans. D
79. The _____________
services include file transfer, remote access, shared database management, and
mail services.
A. physical layer B. data link layer C.
network layer D. application layer
Ans. D
80. Encryption and
decryption are functions of
A. Transport layer
B. Session layer
C. Presentation layer
D. None of the above
Ans. C
81. Which of the
following layers of OSI reference model is concerned with the syntax of data
exchanged between application entities?
A. Transport layer
B. Session layer
C. Presentation layer
D. None of the above
Ans. C
82. Function of
transport layer in OSI reference model is
A. Error free transmission
B. To ensure and cost defective delivery of
data
C. To check the routing and congestion control
D. None of the above
Ans. B
83. Flow control in
OSI models is done by
A. Data link layer B. Network layer C.
Transport layer D. Both data link and transport layers
Ans. A
84. Subnet usually
comprises
A. Network layer B. Transport layer C.
Presentation layer D. Application layer
Ans. A
85. An internetworking
device operating at the transport layer is called a
A. Bridge B. Router C. Repeater D. Gateway
Ans. D
86. In respect of OSI
model, LANs implement
A. Lower two layers
B. All seven layers
C. Upper five layers
D. None of the above
Ans. B
87. The Media Access
Control Sublayer resides in which OSI layer?
A. Network layer B. Transport layer C.
Presentation layer D. Data link layer
Ans. D
88. Flow control is
the mechanism to regulate the flow of information, so that a fast host cannot
overrun a slow one. This is the function of the following OSI layer.
A. All layers B. Physical layer C. Transport
layer D. Application layer
Ans. A
89. In OSI model,
which of the following layer provides error-free delivery of data?
A. Network layer B. Transport layer C.
Presentation layer D. Application layer
Ans. B
90. A device operating
at network layer is called __________
A. Router B. Equalizer C. Bridge D. Repeater
Ans. A
91. A device operating
at physical layer is called __________
A. Router B. Equalizer C. Bridge D. Repeater
Ans. D
92. TCP/IP protocol
suite is made up of how many layers
A. 5 B. 4 C. 6 D. 7
Ans. A
93. TCP/IP is related
to __________
A. ARPANET B. OSI C. DECNET D. ALOHA
Ans. A
94. UDP in the
Internet protocol suite is related to
A. Transport layer B. Network layer C.
Application layer D. Physical layer
Ans. A
95. IP, ARP, RARP,
ICMP and IGMP are related to
A. Transport layer B. Network layer C.
Application layer D. Physical layer
Ans. B
96. SCTP, TCP and UDP
are related to
A. Transport layer B. Network layer C.
Application layer D. Physical layer
Ans. A
97. SMTP, FTP, HTTP,
DNS, SNMP and TELNET are related to
A. Transport layer B. Network layer C.
Application layer D. Physical layer
Ans. C
98. How many levels of
addressing is provided in TCP/IP protocol?
A. One B. Two C. Three D. Four
Ans. D
99. Physical address
is provided by
A. Data Link layer B. Network layer C.
Transport layer D. Application layer
Ans. A
100. Logical address
is provided by
A. Data Link layer B. Network layer C.
Transport layer D. Application layer
Ans. B
101. Port address is
provided by
A. Data Link layer B. Network layer C.
Transport layer D. Application layer
Ans. C
102. Specific address
(eg. email and URL) is provided by
A. Data Link layer B. Network layer C.
Transport layer D. Application layer
Ans. D
103. ____________ is the process of combining multiple signals into one
signal, over a shared medium.
A.
Multiplexing
B.
Demultiplexing
C. Synchronization
D. None
of the above.
Ans.
A
104. ___________ a process reconverting a signal containing
multiple analog or digital signal streams back into the original separate and
unrelated signals.
A.
Multiplexing
B.
Demultiplexing
C.
Synchronization
D. None
of the above.
Ans.
B
105. Network
performance is measured in the following ways:
A.
Bandwidth
B.
Latency
C.
Both (a) and (b)
D.
None of the above
Ans.
C
106. ________ of a network is given by the number of bits that can be
transmitted over the network in a certain period of time.
A. Bandwidth
B. Latency
C. Data rate
D. None of the above
Ans. A
107. _________ of a network is given by time, taken by a message to travel from
one end of a network to other.
A. Bandwidth
B. Latency
C. Data rate
D. None of the above
Ans. B
108. ____________ is a measure of how fast we
can actually send data through a network.
A. Output
B. Throughput
C. Latency
D. None of the above.
Ans. B
109. Sum of Propagation time, Transmission
time, Queuing time and Processing delay is
A. Bandwidth
B. Latency
C. Data rate
D. None of the above
Ans. B
110. ________defines the number of bits that
can fill the link.
A. Bandwidth-delay product
B. Data rate
C. Latency
D. None of the above
Ans. A
111.
A collection of interconnected networks is
A. internet
B. intranet
C. extranet
D. internetwork
Ans. A
112. An _________________ is a computer network for sharing
information, collaboration tools, operational systems, and other computing
services within an organization
A. internet
B. intranet
C. extranet
D. internetwork
Ans. B
113. An _________________ is a controlled private network that allows
access to partners, vendors and suppliers or an authorized set of customers –
normally to a subset of the information accessible from an organization's intranet.
A. internet
B. intranet
C. extranet
D. internetwork
Ans. C
114. Key elements of a protocol are
A. Syntax
B. Semantics
C. Timing
D. All of the above
Ans. D
115. Requirements to build a computer network
are
A. Server and Client
B. transmission media & software and application
C. Protocol
D. All of the above
Ans. D
116. Sender, Receiver, Message, Transmission
Medium and Protocol are the five components of a ________________________
system.
A. Data Communication
B. visual communication
C. either (a) or (b)
D. None of the above
Ans. A
117. ____________ in the data link layer refers
primarily to methods of error detection and retransmission and is based on
automatic repeat request, which is the retransmission of data.
A. Flow control
B. Error control
C. Access control
D. None of the above
Ans. B
118. A _____________________________ is a
device used to connect a computer or router to a telephone line which provides
the digital subscriber line service for connection to the Internet, which is
often called DSL broadband.
A. Digital Subscriber Line (DSL) modem
B. Cable modem
C. Dial-up modem
D. None of the above
119.
Transmission media are located below the __________ layer.
A. physical B. transport C. network
D. application
Ans. A
120. The _________ medium provides a
physical conduit from one device to another.
A. unguided
B. guided
C. (a) or (b)
D. None of the above
Ans. B
121.
Guided media include
A. twisted-pair cable
B. coaxial cable
C. fiber-optic cable
D. All of the above
Ans. D
122.
___________________ primarily uses the guided media.
A. local telephone system B.
Cellular telephone system C. Radio broadcasting D. Satellite Communication
Ans. A
123.
A ______ cable
comprises of two separate insulated copper wires, which are twisted together
and run in parallel.
A. Fiber-optic
B. Twisted-pair
C. Coaxial
D. None of the above
Ans. B
124.
The most common twisted-pair cable used in communications is referred to as
___________.
A. Unshielded Twisted-Pair (UTP)
B. Shielded Twisted-Pair (STP)
C. either (a) or (b)
D. None of the above
Ans. A
125.
________ cable is used for voice and data communications.
A. Fiber-optic
B. Twisted-pair
C. Coaxial
D. None of the above
Ans. B
126.
___________ cables are used in telephone lines.
A. Fiber-optic
B. Twisted-pair
C. Coaxial
D. None of the above
Ans. B
127. _________ cable is a type of electrical cable
consisting of an inner conductor surrounded by a concentric conducting shield,
with the two separated by a dielectric;
A. Fiber-optic
B. Twisted-pair
C. Coaxial
D. None of the above
Ans. C
128.
_________ cable is used to transmit
both analog and digital signals.
A. Fiber-optic
B. Twisted-pair
C. Coaxial
D. None of the above
Ans. C
129.
_______ cable can carry signals of higher frequency ranges than twisted-pair
cable.
A. Coaxial
B. Twisted-pair
C. fiber-optic
D. None of the above
Ans. A
130.
The co-axial cable has excellent noise immunity due to ________
A. shield provided
B. inner conductor
C. outer conductor
D. None of the above
Ans. A
131.
A ___________ cable is made of glass or plastic inner core which is surrounded
by a cladding, and all are encased in an outsider jacket.
A. Coaxial
B.
Twisted-pair
C. fiber-optic
D. None of the above
Ans. C
132.
In fiber-optic cable, a glass or plastic core is surrounded by a cladding of
______ glass or plastic.
A. less dense
B. more dense
C. same dense
D. None of the above
Ans. A
133.
A _______ cable transmits signals in the form of light.
A. Coaxial
B.
Twisted-pair
C. fiber-optic
D. None of the above
Ans. C
134. When the angle of incidence is
____________ the critical angle, the light beam bends along the interface.
A. less than
B. greater than
C. equal to
D. None of the above
Ans. C
135. When the angle of incidence is
____________ the critical angle, the ray refracts and moves closer to the
surface.
A. less than
B. greater than
C. equal to
D. None of the above
Ans. A
136. When the angle of incidence is
____________ the critical angle, the ray reflects (makes a turn) and travels
again in the denser substance.
A. less than
B. greater than
C. equal to
D. None of the above
Ans. B
137.
In a Fibre-optic cable, the signal is transmitted along the inner core by
A. reflection
B. refraction
C. either (a) or (b)
D. None of the above
Ans. A
138.
Advantages of fiber-optic cable over twisted-pair cable and co-axial cable are:
A. Higher bandwidth & Less
signal attenuation
B. Immunity to electromagnetic
interference & tapping
C. Resistance to corrosive materials
& light weight
D. All of the above
Ans. D
139.
_________ media transport electromagnetic waves without using a physical
conductor.
A. guided
B. unguided
C. either (a) or (b)
D. None of the above
Ans. B
140.
Communication using ________ is often referred to as wireless communication.
A. guided
B. unguided
C. either (a) or (b)
D. None of the above
Ans. B
141. Unguided media is generally
suited for ___________ in all directions.
A. local
telephone system
B.
Cellular telephone system
C. Radio
broadcasting
D.
Satellite Communication
Ans. C
142. Signals with a frequency below
2 MHz use ________ propagation.
A. ground
B. sky
C. line-of-sight
D. None of the above
Ans. A
143. Signals with a frequency
between 2 MHz and 30 MHz use ________ propagation.
A. ground
B. sky
C. line-of-sight
D. None of the above
Ans. B
144. Signals with a frequency above
30 MHz use ________ propagation.
A. ground
B. sky
C. line-of-sight
D. None of the above
Ans. C
145.
Which of the following are Wireless transmission waves?
A. Radio wave
B. Microwave
C. Infrared wave
D. All of the above
Ans. D
146.
Electromagnetic Waves ranging in frequencies between 3 kHz and 1 GHz are called
A. Radio waves
B. Microwaves
C. Infrared waves
D. None of the above
Ans. A
147.
________ are used for multicast communications, such as radio and television,
and paging systems.
A. Radio waves
B. Microwaves
C. Infrared waves
D. ultraviolet waves
Ans. A
148.
Radio waves are ___________.
A. unidirectional
B. bidirectional
C. omnidirectional
D. None of the above
Ans. C
149.
Electromagnetic Waves ranging in frequencies between 1 GHz and 300 GHz are
called ________.
A. Radio waves
B. Microwaves
C. Infrared waves
D. ultraviolet waves
Ans. B
150. A parabolic dish antenna is an
________ antenna.
A. unidirectional
B. bidirectional
C. omnidirectional
D. None of the above
Ans. A
151.
_________ are used for unicast communication such as cellular telephones,
satellite networks,
and wireless LANs.
A. Radio waves
B. Microwaves
C. Infrared waves
D. ultraviolet waves
Ans. B
152.
_________ need unidirectional antennas that send out signals in one direction.
A. Radio waves
B. Microwaves
C. Infrared waves
D. ultraviolet waves
Ans. B
153.
Electromagnetic Waves ranging in frequencies between 300 GHz and 400 THz are
called
A. Radio waves
B. Microwaves
C. Infrared waves
D. ultraviolet waves
Ans. C
154.
_________ can be used for short-range communication in a closed area using
line-of-sight propagation.
A. Radio waves
B. Microwaves
C. Infrared waves
D. none of the above
Ans. C
155.
Which of the following about guided media are true?
A. Radio wave can penetrate walls.
B. Microwave with Higher frequency
ranges cannot penetrate walls.
C. Infrared cannot penetrate walls.
D. All of the above
Ans. D
156. Three methods of switching are
A. Circuit switching, Packet
switching and Protocol switching
B. Circuit switching, Packet
switching and Message switching
C. Loop switching, Packet
switching and Message switching
D. Node switching, Packet switching
and Message switching
Ans. B
157. _____________ is mechanism for moving information between
different networks and network segments.
A. Switching
B. Forwarding
C. Routing
D. Directing
Ans. A
158. In _______________ , all packets use the same path.
A. Packet Switching
B. Circuit Switching
C. Message Switching
D. None of the above
Ans. B
159. Advantages of circuit
switching are
A. Fixed bandwidth B. Low
variance end to end delay C. either (a) or (b) D. Both (a) and (b)
Ans. D
160.
Circuit switched networks are used in
A.
Cellular Network B. Satellite Network C. Cable Network D. Telephone Network
Ans.
D
161.
A circuit switched network is made of switches connected by physical links, in
which each link is divided into
A.
n channels B. n+1 channels C. 2n Channels D. n-1 channels
Ans.
A
162.
A circuit switched network consists of a series of interlinked nodes, called
A.
endpoints B. packets C. switches D. links
Ans.
C
163.
The actual communication in a circuit switched network requires
A.
one phase B. two phases C. three phases D. four phases
Ans.
C
164.
Setup, data transfer and connection teardown are three phases of
A.
Circuit switching B. Packet switching C. Message switching D. None
Ans.
A
165.
Circuit switching takes place at the
A.
Network layer B. Physical layer C. Session layer D. Data link layer
Ans.
B
166. A ___________ network is
made of a set of switches connected by physical links, in
which each link is divided into n channels.
A. line-switched
B. frame-switched
C. circuit-switched
D. None of the above
Ans. C
167.
In circuit switching, the resources needs to be reserved during the
A.
data transfer phase B. teardown phase C. setup phase D. propagation phase
Ans.
C
168. Circuit switching is most
ideal for __________ communication, while also keeping the delay uniform.
A.
Voice
B. Data
C.
either (a) or (b)
D. None
of the above
Ans. A
169. Packet switching is used
mainly for _______ transmission as the delay is not uniform.
A.
Voice
B. Data
C.
either (a) or (b)
D. None
of the above
Ans. B
170. The key difference between
circuit switching and packet switching is that
A. Packet Switching is connectionless, whereas circuit
switching is connection-oriented.
B.
Circuit Switching is connectionless, whereas Packet switching is
connection-oriented.
C.
No difference
D.
None of the above
Ans.
A
171. _______________ is
transmission method in which packets are transmitted over a networking medium
that maintain several paths between sender and receiver.
A. Packet Switching
B. Circuit Switching
C. Message Switching
D. None of the above
Ans. A
172.
In a packet switched network, resources are allocated
A.
randomly B. on demand C. reserved already D. both (a) and (c)
Ans.
B
173.
Virtual circuit networks and Datagram Networks are the sub categories of
A.
Message-switched networks
B.
Packet-switched networks
C.
Circuit-switched networks
D.
None of them
Ans.
B
174. Which of the following are true about
Virtual Circuit Switching?
A.
Connection-oriented model
B.
Uses the concept of virtual circuit (VC)
C.
Packet switching methodology whereby a path is established between the source
and the final destination through which all the packets will be routed.
D.
All of the above
Ans.
D
175. Which of the following are true about
Datagram (packet switched) network?
A.
Packet switching technology
B.
Connectionless Approach
C.
A datagram is a basic unit associated with packet-switched network
D.
All of the above
176.
Datagram switching is done at the
A.
Network layer B. Physical layer C. Session layer D. Data link layer
Ans.
A
177. The phase where the
establishment of channels takes place is
A. data transfer phase B.
teardown phase C. setup phase D. propagation phase
Ans. A
178. The network where there is
no resource reservation is called
A. Packet switched network B.
Datagram networks C. Virtual circuit network D. message switched network
Ans. A
179. In _____________ , the
resources need to be reserved during the setup phase; the resources remain
dedicated for the entire duration of data transfer phase until the teardown
phase.
A. datagram switching
B. circuit switching
C. frame switching
D. None of the above
Ans. B
180. In ______________, there is
no resource allocation for a packet.
A. datagram switching
B. circuit switching
C. frame switching
D. None of the above
Ans. A
181. In ____________, resources
are allocated on demand.
A. datagram switching
B. circuit switching
C. frame switching
D. None of the above
Ans. A.
182. In ___________, each packet
is treated independently of all others.
A. datagram switching
B. circuit switching
C. frame switching
D. None of the above
Ans. A
183. In _________ , there are no
setup or teardown phases.
A. datagram switching
B. circuit switching
C. frame switching
D. None of the above
Ans. A
184. Asynchronous Transfer Mode
(ATM) network is an example of
A. Packet switching network B.
Datagram networks C. Virtual circuit network D. message switched network
Ans. C
Dr. Selvaganesan
Dept of IT, JJCET
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