Solved MCQs on Computer Networks

1

. A computer network permits sharing of

• Resources
• Information 
• Both a & b
• None of these

C. Both a & b

2

. The first operational computer network in the world was the _________ for the United States Department of Defense

• ARPANET 
• ERNET
• SKYNET
• DARPANET

A. ARPANET 

3

. ATM stands for

• Automatic taller machine 
• Automated teller machine
• Automatic transfer machine
•  Automated transfer machine

B. Automated teller machine

4

. _______ is the technology that connects the machines and people within a site in a small area

• LAN 
• MAN
• WAN
• None of these

A. LAN 

5

. ______ is a network that covers geographic areas that are larger, such as districts or cities

• LAN 
• MAN 
• WAN
• None of these

B. MAN 

6

. ______ is a network that this technology connects sites that are in diverse locations

• LAN
• MAN
• WAN 
• None of these

C. WAN 

7

. ______ is a collection of point-to-point links that may form a circle

• LAN
• MAN
• WAN
• Ring topology

D. Ring topology

8

. The ISDN Internetworking Equipment devices are

• Terminal Adapters(TAs)
• ISDN Bridges
• ISDN Routers
• All of these

D. All of these

9

. ATM networks are

• connectionless
• Interconnected
• connection oriented
• None of these

C. connection oriented

10

. DHCP stands for

• Dynamic Host Configuration Protocol
• Digital Host Communication Provider
• Digital Host Communication Protocol
• Dynamic Host Configuration Provider

A. Dynamic Host Configuration Protocol

1

. Which protocol layer uses the protocols are WWW, HTTP, FTP, SMTP, e-mail etc

• Application Layer Protocol
• Transport Layer Protocol
• Internet Layer Protocol
• Hardware Layer

A. Application Layer Protocol

2

. The internetworking protocol is known as

• SMTP
• PPP
• TCP/IP 
• NNTP

C. TCP/IP 

3

. If single computer network is divided into segments and router are added between them it forms an

• Internet
• Internetwork 
• Network
• Internetworking

B. Internetwork 

4

. Check sum is used for

• Error correction
• Error detection 
• Both a & b
• None of these

B. Error detection 

5

. The type of packet format supported by X.25 are as follows

• Control packet
• Data packet
• Both a & b 
• None of these

C. Both a & b 

6

. ISDN stands for

• Integrated Service Digital Network 
• Interaction System Digital Network
• Inexpensive System Digital Network
• None of these

A. Integrated Service Digital Network 

7

. If routing information is automatically updated by routers when changes are made to the network configuration are called

• Fixed routing
• Dynamic routing 
• Both a & b
• Distributed routing

B. Dynamic routing 

8

. ARP stands for

• Address Resolution Protocol 
• Address Routing Protocol
• Address Routing Packet
• Address Routing Program

A. Address Resolution Protocol 

9

. If two or more routers are connected to the same subnet, the network administration determines which of the routers the messages should be sent to eliminate this problem._____ are used

• MAC messages
• ICMP messages
• INDP messages
• IMCP messages

B. ICMP messages

10

. If two or more routers are available in distributed routing, which route should be selected

• High possible cost
• Least possible cost
•  Link cost
• Both b & c

C.  Link cost

1

. How many frames are included for traffic in 26TDMA frames

• 1
•  24 
• 25
• 16

B.  24 

2

. What is the port number of the HTTP

• 80
• 25
• 23
• 20/21

A. 80

3

. What is the port number of the SMTP

• 25 
• 23
• 20/21
• 27960

A. 25 

4

. TCP is ______________

• Connection-oriented
• Reliable
• Both a & b
• None of these

C. Both a & b

5

. Which is a network protocol that is based on UDP and is a component of the Internet Protocol Suite, defined by IETF(Internet Engineering Task Force)

• SNMP 
• Scalability
• Screening
• Multicasting

A. SNMP 

6

. In X.25 defines the protocols from

• Layer 2 to Layer 3
• Layer 1 to Layer 2
• Layer 1 to Layer 3
• Layer 3 to Layer 2

C. Layer 1 to Layer 3

7

. Advantages of cell relay are

• High-speed transmission
• Multiplexing transmission
• Both a & b
• None of these

C. Both a & b

8

. When compared with the OSI reference model, the IEEE standard contains the following layers:

• Physical layer
• Medium access control(MAC) equivalent to the lower part of the OSI data link layer
• Logical link layer(LAC) equivalent to the upper part of the data link layer
• Network layer, the OSI network layer, that performs some of the higher order layer functions
• All of these

E. All of these

9

. In a token ring, the stations are connected to the __________

•  Logical ring 
• Physical ring
• Both a & b
• None of these

A.  Logical ring 

10

. A _________ preamble is used to synchronize the receiver’s clock

• Four-byte
• Three-byte
• Two-byte
• One-byte

D. One-byte

1

. Network of networks is known as _________

• intranet
• internet
• Local Area Network
• WAN

B. internet

2

. An interconnection of ________________________ computers is called an Internet

• Distributed
• Co-Ordinated
• Autonomous
• Integrated

C. Autonomous

3

. When a packet with the code is transmitted, it is received and processed by every machine on the network. This mode of operation is called

• broadcasting
• multi casting
• unicasting
• point-to-point

A. broadcasting

4

. point-to-point transmission with one sender and one receiver is sometimes called ________

• multicasting
• unicasting
• personal area network
• LAN

B. unicasting

5

. The entities comprising the corresponding layers on different machine are called ________

• protocol
• peers
• interface
• flow control

B. peers

6

. When the packets are small and all the same size, they are often called ________

• packet switched
• cells
• circuit switched
• virtual circuit

B. cells

7

. A collection of interconnected networks is called as __________

• internet
• intranet
• topology
• interface

A. internet

8

. Starting around 1988, the more advanced ______ twisted pairs were introduced.

• category3
• category5
• category8.
• category10

B. category5

9

. Each ray is said to have a different mode, so a fiber having this property is called ________

• unimode
• singlemode
• multimode
• triplemode

C. multimode

10

. The number of oscillations per second of a wave is called its ______

• wavelength
• frequency
• spectrum
• sequence

B. frequency

1

. If a computer on the network shares resources for others to use, it is called _____

• server
• client
• mainframe
• microcomputer

A. server

2

. For large networks _____ topology is used.

• bus
• ring
• star
• irregular

C. star

3

. X.25 is an example of __________ network.

• packet switched
• circuit switched
• frame relay
• ring based

A. packet switched

4

. What is the maximum length of STP?

• 100 ft
• 200ft 
• 100m
• 200m

D. 200m

5

. ISDN is an example of _______ network.

• packet switched
• circuit switched
• frame relay
• ring based

B. circuit switched

6

. What is the maximum data capacity of STP?

• 10 mbps
• 100 mbps
• 1000 mbps
• 10000 mbps

B. 100 mbps

7

. In ______ topology if the computer cable is broken, networks get down

• bus
• ring
• star
• irregular

A. bus

8

. Terminators are used in ________ topology.

• bus
• ring
• star
• irregular

A. bus

9

. ________ layer decides which physical path the data should take.

• Network
• Transport
• Physical
• Data Link

C. Physical

10

. Print server uses spool which is a ______ that holds data before it is send to the printer.

• queue
• buffer
• node
• ring

B. buffer

  

1

. Protocols in which the sender sends one frame and then waits for an acknowledgement before proceeding are called __________

• sliding window.
• stop and wait.
• frame buffer.
• analog.

B. stop and wait.

2

. The data link layer takes the packet it gets from the network layer and encapsulates them into ___________

• cells
• frames
• packet
• trailer

B. frames

3

. The data link layer takes the packets from _____ and encapsulates them into frames for transmission.

• network layer
• physical layer
• transport layer
• application layer

A. network layer

4

. Which one of the following task is not done by data link layer?

• framing
• error control
• flow control
• channel coding

D. channel coding

5

. Protocols in which the sender waits for a positive acknowledgement before advancing to the next data item are often called ___________

• ARQ
• PPR
• ARS
• PRP

A. ARQ

6

. The commonly used protocol for webpage transfer is ________

• HTML
• HTTP
• WML
• WTTP

B. HTTP

7

. The frames which are intimated for receiving are called ________

• sending window.
• receiving window
• sender
• receiver

B. receiving window

8

. The analysis which helps in checking whether the protocol is correct is _________

• reachability
• correctness
• reliability
• redundancy

A. reachability

9

. The IP address of a system can be known using the DOS command _______

• ipconfir
• ipconfig
• ipconf 
• ipnum

B. ipconfig

10

. Datagrams using header extension are called __________

• payload
• trailer
• datagram packets
• jumbograms

D. jumbograms

1

. Modulation is the process of ________

•  sending a file from one computer to another computer
• converts digital signals to analog signals
• converting analog signals to digital signals
• echoing every character that is received

D. echoing every character that is received

2

. Which one of the following is a data link protocol?

• ethernet
• point to point protocol
• HDLC
• all the above

D. all the above

3

. Which of the following is used for modulation and demodulation?

• Modem
• Protocols
• Gateway
• Multiplexer

A. Modem

4

. A software that allows a personal computer to pretend it as a terminal is _______

• auto dialing
• bulletin board
• modem
• terminal emulation

D. terminal emulation

5

. Which sublayer of the data link layer performs data link functions that depend upon the type of medium?

• logical link control sublayer
• media access control sublayer
• network interface control sublayer
• none of the mentioned

B. media access control sublayer

6

. Which layer of OSI model is responsible for creating and recognizing frame boundaries?

• Physical layer
• Data link layer.
• Transport layer
• Network layer

B. Data link layer.

7

. If digital data rate of 9600 bps is encoded using 8 – level phase shift keying (PSK) method, the modulation rate is ______

• 1200 bands
• 3200 bands
• 4800 bands
• 9600 bands

C. 4800 bands

8

. Four bits are used for packet sequence numbering in a sliding window protocol. What is the maximum window size?

• 4
• 8
• 15
• 16

C. 15

9

. Header of a frame generally contains

• synchronization bytes
• addresses
•  frame identifier
• all the above

D. all the above

10

. The ________ model shows how the network functions of a computer ought to be organized.

• CCITT
• OSI
• ISO
• ANSI

B. OSI

1

. In an optical fiber the inner core is ______ the cladding.

• more dense than
• the same density as
• less than dense
• another name for

A. more dense than

2

. The inner core of an optical fiber is _____ in composition.

• glass or plastic
• bimetallic
• copper
• liquid

A. glass or plastic

3

. Bits can be send over guided and unguided media as analog signal by

• digital modulation
• amplitude modulation
• frequency modulation
• phase modulation

A. digital modulation

4

. The radio communication spectrum is divided into bands based on ___________

• amplitude
• cost and hardware
• frequency
• transmission media.

C. frequency

5

. When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, ______ occurs.

• reflection
• refraction
• incidence
• criticism

A. reflection

6

. In a noisy environment, the best transmission medium would be _________

• twisted pair
• optical fiber
• coaxial cable
• the atmosphere

B. optical fiber

7

. What is the frequency range used for FM radio transmission?

• Low frequency: 30 KHz to 300 MHz.
• Very Low Frequency : 0 Hz to 30 Hz.
• High frequency : 3 MHz to 30 MHz.
• Very High Frequency : 30 MHz to 300 MHz.

D. Very High Frequency : 30 MHz to 300 MHz.

8

. End-to-end connectivity is provided from host-to-host in _________

• session layer
• presentation layer.
• transport layer
• network layer

C. transport layer

9

. The portion of physical layer that interfaces with the media access control sublayer is called

• physical signalling sublayer
• physical data sublayer
• physical address sublayer
• none of the mentioned

A. physical signalling sublayer

10

. PSS was introduced in the year ________

• 1961
• 1971
• 1981
• 1991

C. 1981

1

. What is the main function of the transport layer?

• Node-To-Node Delivery
• Process-To-Process Message Delivery
• Synchronization
• Updating And Maintenance Of Routing Tables

B. Process-To-Process Message Delivery

2

. Session layer checkpoints _____

• allow just a portion of a file to be resent
• control the addition of the headers
• detect and recover errors
• are involved in dialog control

A. allow just a portion of a file to be resent

3

. To deliver a message to the correct application program running on a host , the _______ address must be consulted.

• port
• IP
• physical
• tunnel

A. port

4

. When a host on network A sends a message to a host on network B, which address does the router look at?

• Port
• Physical
• IP
• Tunnel

C. IP

5

. Which of the following is possible in a taken passing bus network?

• In-service expansion
• Unlimited number of stations
• Unlimited distance
• Limited distance

A. In-service expansion

6

. One important characteristics of the hub architecture of ARC-net is

• directionalized transmission
• access control and addressing
• multiple virtual networks
• alternative routing.

A. directionalized transmission

7

. What is the main purpose of a data link content mirror?

•  To detect problems in protocol
• To determine the type of switching used in a data link
• To determine the type of transmission used in a data link
• To determine the flow of data.

A.  To detect problems in protocol

8

. Which of the following is not a standard synchronous communication protocol?

• SDLC
• SLIP
• SMTP
• PAS

D. PAS

9

. IPV6 has _____ bit addresses.

• 32
• 4
• 128
• variable

C. 128

10

. In fiber optics,the signal source is ______ waves.

• light
• infrared
• radio
• very low frequency.

A. light