Data Communication Solved MCQs

 

A group of computers connected together to communicate and share resources is known as                             

A. A computer network✔

B. A server

C. A client

D. Authentication

A network computer that shares resources with and responds to reqests from other computer is known as                        

A. client

B. server✔

C. terminal

D. key

____ protocol is built into most popular e-mail products such as Eudora and Outlook Express:                     

A. SMTP

B. POP✔

C. HTTP

D. FTP

Which protocol is used to transfer web pages?                  

A. TCP/IP

B. SMTP

C. POP3

D. HTTP✔

Which protocol is used to send email?                    

A. SMTP✔

B. POP

C. HTTP

D. FTP

A self-sufficient computer that acts as both a server and a client is known as                       

A. Host

B. Client

C. Server

D. Peer✔

What is the use of Bridge in Network?                   

A. to connect LANs✔

B. to separate LANs

C. to control Network Speed

D. All of the above

A network model where there is no server computer is                                 

A. Centralized Network

B. Client / Server Network

C. Peer-to-Peer Network✔

D. All of above

The network model is sometimes called workgroup is                    

A. Centralized Network

B. Client / Server Network

C. Peer-to-Peer Network✔

D. All of above

Tim Berners Lee is credited for the creation of                   

A. Web email system

B. world wide web✔

C. File Transfer Protocol

D. All of above

Error control is needed at the transport layer because of potential errors occurring _____.                          

A. from transmission line noise

B. in routers✔

C. from out-of-sequence delivery

D. from packet losse

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

A. SDLC

B. SMTP

C. SLIP

D. PAS✔              

The network layer, in reference to the OSI model, provide                          

A. data link procedures that provide for the exchange of data via frames that can be sent and received

B. the interface between the X.25 network and packet mode device

C. the virtual circuit interface to packet-switched service✔

D. All of the above

A computer network permits sharing of

A. Resources

B. Information

C. Both a & b✔

D. None of these

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

A. ARPANET ✔

B. ERNET

C. SKYNET

D. DARPANET

ATM stands for

A. Automatic taller machine

B. Automated teller machine✔

C. Automatic transfer machine

D.  Automated transfer machine

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

A. LAN✔

B. MAN

C. WAN

D. None of these

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

A. LAN

B. MAN ✔

C. WAN

D. None of these

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

A. LAN

B. MAN

C. WAN ✔

D. None of these

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

A. LAN

B. MAN

C. WAN

D. Ring topology✔

The ISDN Internetworking Equipment devices are

A. Terminal Adapters(TAs)

B. ISDN Bridges

C. ISDN Routers

D. All of these✔

A high speed, high capacity transmission medium that can carry signals from multiple independent network carrier is                             

A. Narrowband channel

B. Voice band channel

C. Broadband channel✔

D. None of above

A channel handle moderate data volumes in transmission rate between 110 to 9600 bps is                           

A. Narrowband channel

B. Voice band channel✔

C. Broadband channel

D. None of above

A form of wireless transmission in which signals are sent via pulses of infrared light                          

A. radio networking

B. infrared transmission✔

C. microwave transmission

D. none of above

The interactive transmission of data within a time sharing system may be best suited to                                

A. simplex lines

B. half-duplex lines

C. full duplex lines✔

D. biflex-lines

Who owns and governs the Internet?                    

A. IAB

B. IETF

C. InterNIC

D. None of above✔

Who is responsible for discussing and investigating the operational and technical problems of Internet?                                

A. Internet Architecture Board (IAB)

B. Internet Engineering Task Force (IETF) ✔

C. InterNIC

D. None of above

Website is a collection of                              

A. HTML documents

B. Graphics file

C. audio and video files

D. All of above✔

Which of the following network covers the largest geographical area?                    

A. PAN

B. LAN

C. MAN

D. WAN✔

Router operates in which layer of OSI Reference Model?                              

A. Layer 1 (Physical Layer)

B. Layer 3 (Network Layer) ✔

C. Layer 4 (Transport Layer)

D. Layer 7 (Application Layer)

Which of the following performs modulation and demodulation?                             

A. fiber optics

B. satellite

C. coaxial cable

D. modem✔              

The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as:                   

A. modulation

B. demodulation✔

C. synchronizing

D. digitizing

What is the powerful, centralized computer system that performs data storage and processing tasks on behalf of clients and other network devices ?                        

A. Client

B. Host computer✔

C. Terminal

D. Network

A self-sufficient computer that acts as both a server and a client is known as                       

A. Host

B. Client

C. Server

D. Peer✔

A server computer that is configured to serve file transfer and storage, data migration, file updates synchronization is                             

A. FTP Server

B. Database Server

C. File Server✔

D. None of above

Which of the following is responsible for approving standards and allocating resources in the Internet?                  

A. Internet Architecture Board (IAB) ✔

B. Internet Engineering Task Force (IETF)

C. InterNIC

D. None of above

Which body in Internet provides the registration services to Internet community?                           

A. Internet Architecture Board (IAB)

B. Internet Engineering Task Force (IETF)

C. InterNIC✔

D. None of above

Who is responsible for discussing and investigating the operational and technical problems of Internet?                                

A. Internet Architecture Board (IAB)

B. Internet Engineering Task Force (IETF) ✔

C. InterNIC

D. None of above

Which is the channel handle moderate data volumes in transmission rate between 110 to 9600 bps?                       

A. Narrowband channel

B. Voice band channel✔

C. Broadband channel

D. None of above

A high speed, high capacity transmission medium that can carry signals from multiple independent network carrier is?                           

A. Narrowband channel

B. Voice band channel

C. Broadband channel✔

D. None of above

The internet was developed by US                          

A. Department of Defense✔

B. Department of Electronics

C. Department of Commerce

D. None of above

A user can get files from another computer by using                       

A. File Transfer Protocol✔

B. TCP/IP

C. Internet Protocol

D. None of above

Which server computer that is configured to serve file transfer and storage, data migration, file updates synchronization?                              

A. FTP Server.

B. Database Server

C. File Server✔

D. None of above

Which of the following is responsible for approving standards and allocating resources in the Internet?                  

A. Internet Architecture Board (IAB) ✔

B. Internet Engineering Task Force (IETF)

C. InterNIC

D. None of above

Which body in Internet provides the registration services to Internet community?                           

A. Internet Architecture Board (IAB)

B. Internet Engineering Task Force (IETF) ✔

C. InterNIC

D. None of above

Which of the following is not email service?                         

A. Hotmail

B. Gmail

C. Yahoo✔

D. None of above

Which of the following application is required to read your email in Hotmail?                       

A. A computer with browser and internet connection✔

B. Outlook Express or Microsoft Outlook

C. Eudora Pro

D. All of above

ATM networks are

A. connectionless

B. Interconnected

C. connection oriented✔

D. None of these

DHCP stands for

A. Dynamic Host Configuration Protocol✔

B. Digital Host Communication Provider

C. Digital Host Communication Protocol

D. Dynamic Host Configuration Provider

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

In the original ARPANET, _______ were directly connected together

A. IMPs✔

B. host computers

C. networks

D. routers

This was the first network.

A. CSNET

B. NSFNET

C. ANSNET

D. ARPANET✔

Which organization has authority over interstate and international commerce in the communications field?

A. ITU-T

B. IEEE

C. FCC✔

D. ISOC

_______ are special-interest groups that quickly test, evaluate, and standardize new technologies.

A. Forums✔

B. Regulatory agencies

C. Standards organizations

D. All of the above

Which agency developed standards for physical connection interfaces and electronic signaling specifications?

A. EIA✔

B. ITU-T

C. ANSI

D. ISO

______ is the protocol suite for the current Internet.

A. TCP/IP✔

B. NCP

C. UNIX

D. ACM

______ 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

________ defines how a particular pattern to be interpreted, and what action is to be taken based on that interpretation.

A. Semantics✔

B. Syntax

C. Timing

D. None of the above

_______ refers to two characteristics: when data should be sent and how fast it can be sent.

A. Semantics

B. Syntax

C. Timing✔

D. none of the above

Data flow between two devices can occur in a _______ way.

A. simplex

B. half-duplex

C. full-duplex

D. all of the above✔

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

In a ________ connection, three or more devices share a link.

A. multipoint✔

B. point-to-point

C. (a) and (b)

D. none of the above

______ refers to the physical or logical arrangement of a network.

A. Data flow

B. Mode of operation

C. Topology✔

D. None of the above

C. Topology

Devices may be arranged in a _____ topology

A. mesh

B. ring

C. bus

D. all of the above✔

A _______ is a data communication system within a building, plant, or campus, or between nearby buildings.

A. MAN

B. LAN✔

C. WAN

D. none of the above

A ______ is a data communication system spanning states, countries, or the whole world.

A. MAN

B. LAN

C. WAN✔

D. none of the above

________ is a collection of many separate networks.

A. A WAN

B. An internet✔

C. a LAN

D. None of the above

There are ______________ Internet service providers.

A. local

B. regional

C. national and international

D. all of the above✔

A ________ is a set of rules that governs data communication.

A. forum

B. protocol✔

C. standard

D. none of the above

The _______ is the physical path over which a message travels.

A. Protocol

B. Medium✔

C. Signal

D. All the above

The information to be communicated in a data communications system is the _______.

A. Medium

B. Protocol

C. Message✔

D. Transmission

Frequency of failure and network recovery time after a failure are measures of the _______ of a network.

A. Performance

B. Reliability✔

C. Security

D. Feasibility

An unauthorized user is a network _______ issue.

A. Performance

B. Reliability

C. Security✔

D. All the above

Which topology requires a central controller or hub?

A. Mesh

B. Star✔

C. Bus

D. Ring

Which topology requires a multipoint connection?

A. Mesh

B. Bus✔

C. Ring

D. Star

Communication between a computer and a keyboard involves ______________ transmission.

A. simplex✔

B. half-duplex

C. full-duplex

D. automatic

A television broadcast is an example of _______ transmission.

A. simplex✔

B. half-duplex

C. full-duplex

D. automatic

_______ connection provides a dedicated link between two devices.

A. point-to-point✔

B. multipoint

C. primary

D. secondary

In a _______ connection, more than two devices can share a single link.

A. point-to-point

B. multipoint✔

C. primary

D. secondary

 

 

In a _______ connection, more than two devices can share a single link.
A. Point-to-point
B. Primary
C. Multi-point ✔
D. Secondary

Communication between a computer and a keyboard involves ______________
transmission
A. Full-duplex
B. Half-duplex
C. Simplex✔
D. None of these

 In a network with 25 computers, which topology would require the most
extensive cabling?
A. Star
B. Mesh✔
C. Bus
D. None of these

 Which topology requires a central controller or hub?
A. Star✔
B. Mesh
C. Bus
D. Ring 

 Which organization has authority over interstate and international commerce in the communications field?
A. ITU-T
B. IEEE
C. ISO
D. FCC✔

 The information to be communicated in a data communications system is the ________
A. Medium
B. Protocol
C. Transmission
D. Message✔

 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

 In _______ transmission, the channel capacity is shared by both communicating devices at all times.
A. Full-duplex✔
B. Simplex
C. Half-duplex
D. Half-Simplex

 An unauthorized user is a network _______ issue.
A. Performance
B. Reliability
C. Security✔
D. All of the above

 Which topology requires a multipoint connection?
A. Mesh
B. Star
C. Ring
D. Bus✔

 A television broadcast is an example of _______ transmission.
A. Half-duplex
B. Full-duplex
C. Simplex✔
D. Automatic

 A _______ connection provides a dedicated link between two devices.
A. Multi-point
B. Point-to-Point✔
C. Primary
D. Secondary

 A cable break in a _______ topology stops all transmission.
A. Mesh
B. Star
C. Primary
D. Bus✔

 The _______ layer changes bits into electromagnetic signals.
A. Physical✔
B. Transport
C. None of the above
D. Data link

The physical layer is concerned with the transmission of _______ over the physical medium.
A. Programs
B. Protocols
C. Bits✔
D. Dialog

Mail services are available to network users through the _______ layer.
A. Data link
B. Physical
C. Application✔
D. Transport

As the data packet moves from the lower to the upper layers, headers are _______.
A. Added
B. Rearranged
C. Modified
D. Subtracted✔

 As the data packet moves from the upper to the lower layers, headers are _______.
A. Removed
B. Added✔
C. Rearranged
D. Modified

 The _______ layer lies between the network layer and the application layer.
A. Data link
B. Physical
C. Transport✔
D. None of the above

 Layer 2 lies between the physical layer and the _______ layer.
A. Data link
B. Network✔
C. Transport
D. None of the above

 When data are transmitted from device A to device B, the header from A’s layer 4 is read by B’s _______ layer.
A. Application
B. Physical
C. Transport✔
D. None of the above

Which layer functions as a liaison between user support layers and network support layers?
A. Network layer
B. Transport layer✔
C. Physical layer
D. Application layer

 What is the main function of the transport layer?
A. Process-to-process delivery✔
B. Node-to-node delivery
C. Synchronization
D. Updating and maintenance of routing tables

 Which of the following is an application layer service?
A. Remote log-in
B. File transfer and access
C. Mail service
D. All the above✔ 

 The Internet model consists of _______ layers.
A. Three
B. Five✔
C. Seven
D. Eight

 The process-to-process delivery of the entire message is the responsibility of the _______ layer.
A. Physical
B. Network
C. Transport✔
D. Application

 The _______ layer is the layer closest to the transmission medium.
A. Network
B. Physical✔
C. Data link
D. Transport

 Before data can be transmitted, they must be transformed to ________.
A. Electromagnetic signals✔
B. Periodic signals
C. Aperiodic signals
D. Low-frequency sine waves

 When one of the components of a signal has a frequency of zero, the average amplitude of the signal ________.
A. Is less than zero
B. Is greater than zero✔
C. Is zero
D. A. or (b)

 A periodic signal completes one cycle in 0.001 s. What is the frequency?
A. 1 Hz
B. 100 Hz
C. 1 KHz✔
D. 1 MHz

 In a frequency-domain plot, the horizontal axis measures the ________.
A. Frequency✔
B. Peak amplitude
C. Phase
D. Slope

 In a time-domain plot, the vertical axis is a measure of ________.
A. Frequency
B. Phase
C. Amplitude✔
D. Time

 If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency?
A. 5 KHz
B. 10 KHz
C. 47 KHz
D. 57 KHz✔

 What is the bandwidth of a signal that ranges from 40 KHz to 4 MHz?
A. 3.96 MHz✔
B. 36 MHz
C. 360 KHz
D. 396 KHz

 As frequency increases, the period ________.
A. Decreases✔
B. Increases
C. Remains the same
D. Doubles

 When propagation speed is multiplied by propagation time, we get the ________.
A. Throughput
B. Wavelength of the signal
C. Distance a signal or bit has traveled✔
D. Distortion factor

Propagation time is ________ proportional to distance and ________ proportional to propagation speeD.
A. Inversely; directly
B. Inversely; inversely
C. Directly; inversely✔
D. Directly; directly

 Wavelength is ________ proportional to propagation speed and ________ proportional to perioD.
A. Directly; directly✔
B. Inversely; directly
C. Directly; inversely
D. Inversely; inversely

 Which of the following can be determined from a frequency-domain graph of a signal?
A. Phase
B. Power
C. Frequency
D. Bandwidth✔ 

 Which of the following can be determined from a frequency-domain graph of a signal?
A. Phase
B. Bandwidth✔
C. Power
D. All the above

 In a frequency-domain plot, the vertical axis measures the ________.
A. Frequency
B. Peak amplitude✔
C. Phase
D. Slope

 Given two sine waves A and B, if the frequency of A is twice that of B, then the period of B is ________ that of A.
A. One-half
B. Twice✔
C. The same as
D. Indeterminate from

 The wavelength of green light in air is ________ the wavelength of green light in fiber-optic cable.
A. Greater than
B. Less than✔
C. Equal to
D. None of the above

 Using the Shannon formula to calculate the data rate for a given channel, if C = B, then ________.
A. The signal is equal to the noise✔
B. The signal is less than the noise
C. The signal is greater than the noise
D. Not enough information is given to the question

 A sine wave is ________.
A. Aperiodic and continuous
B. Periodic and discrete
C. Aperiodic and discrete
D. Periodic and continuous✔

 If the maximum amplitude of a sine wave is 2 V, the minimum amplitude is ________ V.
A. 2
B. 1
C. -2✔
D. Between -2 and 2

 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 is zero
B. P2 equals P1✔
C. P2 is much larger than P1
D. P2 is much smaller than P1

 ________ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium.
A. Distortion
B. Noise
C. Decibel
D. Attenuation✔

 ________ is a type of transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal.
A. Attenuation
B. Noise
C. Distortion✔
D. Decibel

 ________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal.
A. Attenuation
B. Noise✔
C. Distortion
D. Decibel 

 The ________ has units of meters/second or kilometers/seconD.
A. Throughput
B. Propagation time
C. Propagation speed✔
D. B.and C.  

 ________ has units of bits/seconD.
A. Throughput✔
B. Propagation speed
C. Propagation time
D. B.and C.  

 The ________ has units of seconds.
A. Throughput
B. Propagation time✔
C. Propagation speed
D. A. and (b) 

 The wavelength of a signal depends on the ________.
A. Frequencies of the signal
B. Medium
C. Phase of the signal
D. A. and (b) ✔ 

 Which encoding technique attempts to solve the loss of synchronization due to long strings of 0s?
A. NRZ
B. BnZS✔
C. AMI
D. A. and (b) 

 Block coding can help in _______ at the receiver.
A. Synchronization
B. Error detection
C. Attenuation
D. A. and (b) ✔ 

 In _______ transmission, bits are transmitted simultaneously, each across its own wire.
A. Parallel✔
B. Asynchronous serial
C. Synchronous serial
D. A. and (b)

 

 Unipolar, bipolar, and polar encoding are types of _______ encoding.
A. Block
B. Line✔
C. NRZ
D. Manchester

 _______ encoding has a transition at the middle of each bit.
A. RZ
B. Manchester
C. Differential Manchester
D. All the above✔ 

 _______ encoding has a transition at the beginning of each 0 bit.
A. Differential Manchester✔
B. RZ
C. Manchester
D. All the above 

 PCM is an example of _______ conversion.
A. Analog-to-analog
B. Analog-to-digital✔
C. Digital-to-digital
D. Digital-to-analog  

 In asynchronous transmission, the gap time between bytes is _______.
A. Fixed
B. A function of the data rate
C. Variable✔
D. Zero 

 Synchronous transmission does not have _______.
A. A start bit
B. A stop bit
C. Gaps between bytes
D. All the above✔ 

 Which encoding type always has a nonzero average amplitude?
A. Polar
B. Bipolar
C. Uni-polar✔
D. All the above 

 Which of the following encoding methods does not provide for synchronization?
A. Manchester
B. NRZ-L✔
C. RZ
D. NRZ-I 

 Which encoding method uses alternating positive and negative values for 1s?
A. Manchester
B. AMI✔
C. NRZ-I
D. RZ

 In PCM, an analog-to- _______ conversion occurs.
A. Analog
B. Digital✔
C. QAM
D. Differential 

 If the maximum value of a PCM signal is 31 and the minimum value is -31, how many bits were used for coding?
A. 4
B. 5
C. 6✔
D. 7 

 RZ encoding involves _______ signal levels.
A. Five
B. Four
C. Three✔
D. Two 

 Which quantization level results in a more faithful reproduction of the signal?
A. 2
B. 8
C. 16
D. 32✔ 

 n _______ transmission, bits are transmitted over a single wire, one at a time.
A. Asynchronous serial
B. Synchronous serial
C. Parallel
D. A. and (b) ✔ 

 In _______ transmission, a start bit and a stop bit frame a character byte.
A. Synchronous serial
B. Asynchronous serial✔
C. Parallel
D. A. and (b) 

If a symbol is composed of 3 bits, there are _______ data levels.
A. 2
B. 4
C. 8✔
D. 16  

 Pulse rate is always _______ the bit rate.
A. Less than
B. Less than or equal to✔
C. Greater than
D. Greater than or equal to 

 AM and FM are examples of ________ modulation.
A. Analog-to-analog✔
B. Analog-to-digital
C. Digital-to-digital
D. Digital-to-analog

 In QAM, both phase and ________ of a carrier frequency are varieD.
A. Frequency
B. Bit rate
C. Amplitude✔
D. Baud rate 

 Which of the following is most affected by noise?
A. PSK
B. FSK
C. QAM
D. ASK✔ 

 ASK, PSK, FSK, and QAM are examples of ________ modulation.
A. Analog-to-analog
B. Analog-to-digital
C. Digital-to-digital
D. Digital-to-analog✔ 

 If the baud rate is 400 for a 4-PSK signal, the bit rate is ________ bps.
A. 1600 100
B. 800✔
C. 400
D. 100 

 If the bit rate for an ASK signal is 1200 bps, the baud rate is ________.
A. 300
B. 400
C. 600
D. 1200✔ 

 As the bit rate of an FSK signal increases, the bandwidth ________.
A. Remains the same
B. Decreases
C. Increases✔
D. Doubles 

 In 16-QAM, there are 16 ________.
A. Phases
B. Combinations of phase and amplitude✔
C. Amplitudes
D. bps 

 Which modulation technique involves tribits, eight different phase shifts, and one amplitude?
A. FSK
B. ASK
C. 4-PSK
D. 8-PSK✔ 

If the bit rate for an FSK signal is 1200 bps, the baud rate is ________.
A. 300
B. 400
C. 600
D. 1200✔ 

 If the bit rate for a QAM signal is 3000 bps and a signal unit is represented by a tribit, what is the baud rate?
A. 300
B. 400
C. 1000✔
D. 1200   

 If FCC regulations are followed, the carrier frequencies of adjacent AM radio stations are ________ apart.
A. 5 KHz
B. 10 KHz✔
C. 200 KHz
D. 530 KHz 

 If FCC regulations are followed, ________ potential FM stations are theoretically possible in a given areA.
A. 50✔
B. 100
C. 133
D. 150  

 The bandwidth of an FM signal requires 10 times the bandwidth of the _______ signal.
A. Bipolar
B. Sampling
C. Carrier
D. Modulating✔ 

 Modulation of an analog signal can be accomplished through changing the ________ of the carrier signal.
A. Amplitude
B. Frequency
C. Phase
D. Any of the above✔ 

 For a telephone line, the bandwidth for voice is usually _______ the bandwidth for data.
A. Less than
B. Greater than✔
C. Twice
D. Equivalent to