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CS601 GRAND QUIZ
Data Communication Quiz with Answer
Simultaneous transmission of multiple signal across a single data link is called-------
Demultiplexing
Multiplexing
Modulation
demodulation
in NRZ-1 the signal is inverted if is encountered.
---------------- Protocol suite is being used by the modern internet communication.
OSI
TCP/IP
ARPANET
Telnet
In the frequency shift keying, remain(s) constant.
Frequency
Amplitude
Both amplitude and phase
Both phase and frequency
In signal changes its shape or form.
Thermal noise
Distortion
Impulse noise
Attenuation
Which one of following is a scrambling coding technique?
B8ZS
B8SZ
B08SZ
BZ8S
According to the Fourier analysis, frequencies obtained after decomposition of digital signals are .
Continuous
Discrete
Bit length
Homogeneous
Low pass channel has bandwidth between two stations.
Dedicated
Shared
Multiplexed
Infinite
is the heart of blocking code.
Coding
Division
Substitution
Multiplication
Wireless transmission can be divided into broad groups.
Two
Three
Four
Five
Wiring used for transmission modes depends upon .
Latency
Data Stream
Data sniffing
Packet Tracing
If a digital transmission system is sending five bits in every half a second, the bit-rate of the system.
5 bps
10 Hz
0.2 bps
10 bps
If the message going to pass through a packet-switched network, it can be divided into packets of .
Fixed size
Variable size
Both fix and Variable size
None
In an analogue hierarchy to carry voice channels, a group can carry voice channels.
60
12
20
10
In optical fiber a glass or plastic core is surrounded by a .
Cladding
Outer conductor shield
Inner Conductor shield
Insulator
In transmission impairments noise occurs from other sourcelike
Impulse
Induced
Cross talk
Thermal
is a digital process that allows connections to share the high bandwidth of a
link.
FDM
TDM
WDM
None of the choices is correct
Bandwidth in hertz in the range of contained in a composite signal.
Signals
Phases
Amplitudes
Frequencies
LAN stands for .
Logical area network
Long-distance Area Network
Local Area Network
Long Area Network Demultiplexer is a device.
One to many
Many to many
One to one
Many to many
Mr. Asif while sitting in Lahore is linking with his friend in Dubai through Skype is a .
Local Area Network
Metropolitan Area Network
Wide Area Network
Home Based Network
In modulation, frequency and amplitude remain constant.
Phase
Frequency
Amplitude
Quadrature
In TDM based digital hierarchy used by the Telephone companies, DS-0 is a single digital channel of .
1.544 Mbps
128 kbps
64 kbps
32 kbps
The bandwidth-delay product defines the number of bits that can fill the .
Link
Network
Hub
Switch
If a digital-signals has four levels, then we need bits to represent each level.
2
3
4
5
Routing is a function of layer.
Network
Physical
Transport
Datalink
relatively measures the strength of two signals.
Signal rate
Bit rate
Decibel
Pulse rate
Taking off the header from the message is called .
Layering
Encryption
Decapsulation
Stuffing
Which of the following is not a characteristic of a sine wave?
Amplitude
Segmentation
Phase
Frequency
In frequency domain plot, which value is replaced with frequency?
Wavelength
Amplitude
Phase
Time
is the process of converting binary data to a digital signal.
QAM
ASK
FSK
Line coding
Low pass channel with bandwidth is not real and is used for theoretical modeling.
Multiplex
Infinite
Ethernet
Narrow
HDB3 falls under which coding scheme?
Bipolar
Bi phase
Line
Block
Unit of phase is .
Bits per second
Watts
Bauds
Degree
BFSK stands for .
Baud Frequency Shift Key
Binary Frequency Sif t Key
Barrier Frequency Shift Key
Bridge Frequency Shift Key
is NOT an example of connecting device.
Bridge
Router
TCP
Switch
Coaxial cables are categorized by their ratings.
Electronic Industries Association (EIA)
Amplitude modulation (AM)
Frequency modulation (FM)
Radio Government (RG)
is Shannon capacity formula to determine highest theoretically data rate for a noisy channel.
Capacity=Bandwidth*(1+SNR)
Capacity=Bandwidth*log2(2+SNR)
Capacity=Bandwidth*log2(SNR)
Capacity=Bandwidth*log2(1+SNR)
Which one of the following is not among the required phases for the actual communication in a circuit switched network?
Setup
Data transfer
Protocol
Connection teardown
A common bipolar encoding scheme is called .
AMI
NRZ
RZ
QAM
A telephone line analog signal has got the bandwidth of .
8 kHz
2 kHz
16 kHz
4 kHz
In systems, resources are allocated on demand.
Frequency switching
Line switching
Circuit switching
Packet switching
A fiber-optic cable transmit signals in the form of .
Light
Sound
Waves
None of the given
Composite wave can be used to send .
Bandwidth
Telephone
Amplitude
Frequency
Routing is the function of layer.
Network
Physical
Transport
Data link
A virtual-circuit network operates on layer.
Datalink
Network
Physical
Application
In TCP\IP model, the Physical Layer exchanges data in the form of .
Packets
Frames
Bits
Segments
signal completes certain pattern in a specific amount of time.
Non-periodic
Periodic
A Periodic
Wavelength
Top most organization that provides support for the Internet Standard process is called .
Internet Society (ISOC)
Internet Architecture Board (IAB)
IETF
IRTF
If the message is going to pass through a packet-switched network, it can be divided into packets of .
Fixed size
Variable size
Both-fix and variable size
None
data moves faster and timing errors are less frequent because the transmitter and receiver time is synced.
Synchronous
Asynchronous
Isochronous
Metachronous
In frequency modulation, the frequency of the oscillator changes according to the .
Output Voltage
Output Frequency
Input Voltage
Output Phases
Binary Amplitude Shift Keying also called as:
Dual Keying
On-In Keying
On-Off Keying
In-Out Keying
signals can take infinite levels of intensity over time.
Digital
Discrete
Analog
Logical
Bi-polar uses voltage levels.
One
Two
Three
Four
In serial data transmission data transmission mode can be cheap but slower.
Synchronous
Asynchronous
Isochronous
Metachronous
In star-based network comprising of four computers and one switch, total number of cable needed will be .
Parabolic antenna is used for communication.
Infrared waves
Microwave
Light wave
Radio wave
In circuit switching total Delay is combination of Connection Time and .
Switching time
Acknowledgement time
Receiving time
Connection tear down time
Guard bands are used in multiplexing technique, to avoid overlapping of frequency bands assigned to each user.
PDM
CSMA
TDM
FDM
Datagram switching is done on .
Application Layer
Datalink Layer
Physical Layer
Network Layer
Token Ring was devised by .
IBM
OSI
Dell
NASA
In TDM based digital hierarchy used by the Telephone companies, DS-0 is a digital channel of .
1.544 Mbps
128 kbps
64 kbps
32kbps Repeated
can be published using Request for Comments (RFCs).
Proposed Standard
Draft Standard
Internet Draft
Internet Standard
In transmission impairments noise occurs from the random motion of electrons in a wire.
Thermal noise
Impulse noise
Cross talk
Induced noise
In ASK correct formula for calculating the bandwidth is as -.
B=(1*d)S
B=(d-1)S
B=(d-5)S
Which one of the following is among the required phases for the actual communication in a circuit switched network?
Setup
Data transfer
Protocol
Connection tear down
According to the Fourier analysis, frequencies obtained after decomposition of non-periodic digital signals are .
Bit length
Automatic
Heterogenous
Continuous
The most common type of connector used by the coaxial cable is .
BNC
RJ-45
RJ-11
RJ-57
When data is sent or received using the data bits are organized in a specific order, since they
Parallel data transmission
Serial data transmission
Hybrid data transmission
Both parallel and serial data transmission
have established standards for using these signals for communication between devices such as keyboards, mice, PCs, and printers.
Microwave
Infrared waves
Simple waves
Radio waves
In case of Frequency shift key, the difference between two frequency is represented as .
o 2∆
o 3∆
o 6∆
o 2×5∆
category of coaxial cable is used for thin Ethernet.
RG-58
RG-59
RG-1
RG-47
Cellular telephone uses waves for communication.
Light waves
Infrared waves
Radio waves
Microwaves
mode of serial transmission guarantees fixed rate data.
Synchronous
Asynchronous
Isochronous
Metasochronous
Router is a network device which operates on the layers of the TCP\IP protocol suit.
Application
Transport
Network
Presentation
layer is responsible for the creating of the datagrams.
Physical
Data link
Session
Network
Narrow bands of light in waves division multiplexing are denoted by .
β
∩
α
λ Repeated
In virtual circuit approach when a frame enters a switch and when it leaves a switch its VCI always .
Always changes
Sometimes changes
Sometimes Remain Same
Remain the same
According to stats, fewer than crossbar points can be used at once.
32 bps
64 bps
8 Hz
16 bps Repeated
Cable TV networks use cables.
Coaxial
UTP
STP
Twisted pair Repeated
normally used for long-distance data transfer.
Parallel data transmission
Serial data transmission
Hybrid data transmission
Both parallel and Serial data transmission Repeated
is a block coding method.
NRZ
NRZ-1
8B\10B
8B\12B
TCP\IP was chosen to be the official protocol of internet .
o 1973
o 1980
o 1983
o 1988
To measure the data rate theoretically formula(s)Were developed.
One
Two
Three
Four Repeated
In FSK, Baud rate is less than or equal to rate.
Signal
Decibel
Bit
None of these Given Repeated
signal is represented by the discrete values.
Analog
Digital
Both
Continuous
Electromagnetic waves ranging in frequencies between 3 kHz and 1 GHz are called .
Infrared waves
Radio waves
PCLight waves
Microwaves
Suppose a signal is amplitude then the value od decibel will be .
0
1
Negative
Positive Repeated
technique does not follows analog conversion.
QAM
AM
FM
PM
Repeated
In Pulse Code Modulation (PCM), the sampling is dependent on .
Time
Amplitude
Frequency
Signal Rate
is the sub type of Time Division Multiplexing Technique.
Amplitude TDM
Light TDM
Statistical TDM
Barrier TDM
Modulation of analog signal is needed if the medium is in nature.
Bandpass
Low-pass
Bi-pass
High-pass
Quadrature Amplitude Modulation (QAM) is the combination of and
.
FSK-PSK
PSK-FSK
ASK-PSK
ASK-FSK
There components of data communication system.
4
5
6
7
QPSK stands for .
Quality phase shift key
Queuing phase shift key
Quadrature phase shif t key
Quality physical shift key
To calculate the data rate for noisy channel formula is used.
Shannon
Nyquist
Propagation
Greedy
Most commonly used connector for twisted pair cable is .
RJ-11
RJ-45
RJ-44
RJ-52
Binary Amplitude Shift Keying is also called as:
Dual Keying
On-In Keying
On-Off Keying
In-Out Keying
Some manufacturers provide a special port called the .
IrDA
Consol
Parallel
USB
To calculate the data rate for noiseless channel formula is used.
Ready
Shannon
Nyquist
Propagation
Two PCs and one printer are connected in a network within a room, it is an example of
.
LAN
WAN
MAN
SONET
Analog the following cables given, cable provides highest bandwidth and less attenuation.
UTP
Coaxial cable
Coaxial cable
Fiber optical
To calculate the data for noisy channel formula is used.
Shannon
Nyquist
Propagation
Greedy
In circuit switched networks we have low efficiency but minimal .
Delay
Speed
Throughput
Errors
Signals travel through fiber optic cable are in the form of .
Light
Bits
Electromagnetic
Bytes
Polar encoding scheme uses voltage level.
0
1
2
3
TCP\IP protocol suit consists of layers.
3
5
6
7
Bandwidth in hertz is the range of contained in a composite signal.
Signals
Phases
Amplitudes
Frequencies
is an example of a host in a network.
Router
Computer
Bridge
Hub
Set of rules to be followed for effective communication is called .
Topology
Protocol
Switching
Encryption
is NOT an example of a connecting device.
Bridge
Router
TCP
Switch
When an antenna transmits radio waves, they are propagated in .
All directions
Left directions
Right directions
Only up and down direction
Which one of the following is not a bipolar encoding level?
Negative
One
Zero
Positive
and are the two types of addressing in virtual circuit approach.
Local, Global
Private, Public
Variable, Dynamic
Dependent, Independent
In transmission implements noise occurs from other sources like motors and appliances etc.
Impulse
Inductive
Cross talk
Thermal
In computer network the stations are connected to each other in such a way that each station is connected to every other station through dedicated links. This
makes .
Bus
Ring
Star
Mesh
In scrambling coding scheme, the number of pulses replacing the bits will be ?
Equal to pulses
Double the pulses
Half of the pulses
Triple the pulses
In the context of analog to analog signal conversation technique. “PM” Stands for .
Pulse Modulation
Phase modulation
Parse modulation
Popular modulation
relatively measurement the strength of two signals.
Signals
Bit rate
Decibel
Pulse rate
Datagram approach and circuit approach are two popular approaches which lead us to .
Line switching
Circuit switching
Dynamic switching
Packet switching
If data is to be 1 Mbps then what will be the minimum bandwidth required for NRZ-I coding scheme?
1Khz
200Khz
500khz
0.5khz
In virtual circuit approach when frame enters a switch and when it leaves a switch its VCi always .
Always Changes
Sometimes Changes
Sometimes Remain Same
Remain the Same
A common bipolar coding scheme is called .
AMI
NRZ
RZ
QAM
means loss of energy in signal.
Noise
Delay
Attenuation
Distortion
The conversion of analog simple of the signal into digital form is called
process.
Quantizing
Sampling
Modulation
Quantizing and Sampling
A local telephone network use network.
Line switched
Packet switched
Circuit switched
Bit switched
In Amplitude Shift Keying. of the signal is/are changed.
Amplitude and Frequency
Amplitude
Frequency and Amplitude
Phase
In frequency domain plot, which value is plot on Y-axis?
Time
Frequency
Amplitude
Wavelength
In pulse code modulation the term sampling can also be referred as .
Pulse Amplitude Modulation
Pulse sample Modulation
Pulse line modulation
Pulse Frequency Modulation
Switch is a network device which operates on the layer of TCP/IP protocol suit.
Application
Transport
Presentation
Data link
In analog transmission of digital data, the required bandwidth is always proportional to the signal rate expect in a digital to analog conversion technique.
ASK
FSK
PSK
NSK
WDM stands for .
Wideband De-Modulation
Worst Data Manipulation
Wavelength Division Multiplexing
None of the Choices is correct
does not follows analog to analog conversion.
QAM
AM
FM
PM
On a communication link, different channels are separates by unused strips of bandwidth called as .
Base band
Broad band
Null band o Guard band o
layer converts frames coming from Data Link Layer into bits and sends Them on the transmission medium.
Application
Physical
Network
Transport
Wavelength binds the of a simple sine wave to the propagation speed of the medium.
Phase
Period of the frequency book page 61
Amplitude
Bandwidth
The bandwidth delay product define the number of bits that can fill the .
Link
Network
Hub
Switch
The size of the packet determined by the network and .
Delays
Switching
Instructions o Governing protocol o
To improve the performance of line coding coding was……?
Block coding
MLT-3
2BIQ
Double coding
Which one of the following is not a sampling technique?
Flat Top Sampling
Neutral sampling
Natural sampling
Ideal sampling
is normally used where speed is priority in data transfer.
Serial data transmission
Hybrid transmission
Parallel transmission
Both parallel and serial transmission
In a computer network, five stations are connected to each other in such a way that each station is connected to every other station through dedicated links. This
makes topology.
Bus
Ring
Star
Mesh
Some manufacturer provide a special port called the port that allows a wireless keyboard to communicate with a PC.
IrDA
Consol
Parallel
USB
Current technology supports modes for propagation of light.
Two
Three
Four
Five
We quantize the sampling output into certain levels based on range of and required accuracy.
Frequency
Amplitude
Time period
None
is the Nyquist bit rate formula for noiseless channel.
BitRate=2*Bandwidth*log2 L
BitRate=2*Bandwidth*logL
BitRate=2*Bandwidth*log2L
BitRate=2*Bandwidth*L
A frequency is called , if the rate of change in sine wave Is Instantaneous.
Infinite frequency book page 59
Zero frequency
Bandwidth
Frequency hertz
Which multiplexing technique involves signals composed of light beams?
FDM
TDM
WDM
PDM
is a multiplexing technique which shifts each signal to a different carrier frequency.
FDM
TDM
WDM
PDM
Entire band in United States is regulated by authorities.
FCC
ITU
NASA
ANSI
Two stations are connected via a secure link in which messages are encrypted from source to the destination message is called------------------
Plain text
Cipher test
Message
Protocol (not confirm)
-------------- coding scheme are useful for LAN but not for long ranges.
Biphase book page 113
Line
Vector
Serial
In TDM, each input connection has an allotment in the output even if is not
sending data.
Asynchronous
Statistical
Synchronous (Book page 164)
Isochronous
------------------- is a type of serial transmission in which data bits are transmitted as a continues stream in time with a master clock. Start bits, stop bits, and gaps are not used. Transmitter and receiver time is sync.
Synchronous
Asynchronous
Isochronous
Metasochronous
------------- Relative measures the strength of two signals.
Signal rate
Bit rate
Decibel
Pulse rate
When the bandwidth of a link is greater than the combined bandwidths of the signals, we use multiplexing.
Wavelength division
Frequency division
Time division
Hybrid division
------------ is an example of host in a network.
Router
Computer
Bridge
Hub
On a communication link, different channels are separated by unused strips of bandwidth called as .
Base band
Broad band
Null
Guard band
The conversion of analog sample of the signal into digital form is called process.
Quantizing
Sampling
Modulation
Quantizing and sampling (Book pages 115 to 116 )
In star based network comprising of four computers and on switch, total number of cables needed will be ----------
4
The logical connection between the peer layers is connection.
Physical
Direct (no strong reference but as per book explanation layer to layer is direct )
Indirect
Tangible
In TDM, slots are dynamically allocated to the connected stations to improve
bandwidth efficiency.
Synchronous
Statistical
Isochronous
None of the choice is correct
According to stats, lower than crossbar point can be used at once .
o 25%
-------------- Category of coaxial cable is used for cable TV.
RG-58
RG-59
RG-11
RG-47
-------------- is sometimes called the bit rate.
Signal rate
Modulation rate
Data rate
Pulse rate
Uni polar, polar and bipolar are the types of ---------------
Line
Differential Manchester
NRZ-I
Block
Router is a network device which operates on the layer of the TCP/IP protocol.
Application
Transport
Network
Presentation
According to the Fourier analysis, frequencies obtained after decomposition of no period.
Bit length
Automatic
Heterogeneous
Continuous (Fourier analysis can be used to decompose a digital signal. If the digital signal is
periodic, which is rare in data communications, the decomposed signal has a frequencydomain
representation with an infinite bandwidth and discrete frequencies. If the digital
signal is nonperiodic, the decomposed signal still has an infinite bandwidth, but the frequencies
are continuous page 70 Data communication Book 5th generation )
When the bandwidth of a link is greater than combined bandwidths of the
Wavelength division
Frequency division
Time division
Hybrid division
The technique expands the bandwidth of a signal by replacing each data bit with
n bits using a spreading code.
FDM
FHSS
TDM
DSSS
----------- Cable is used in wavelength division multiplexing.
Twisted pair
Coaxial
Fiber optic
Ethernet
VCI address is address in virtual circuit approach.
Private
Variable
Local
Global
In baseband transmission, a digital signal is transmitted as --.
Analog signal
Digital signal
Modulation signal
Multiplexed signal
telephone network use network.
Line switched
Packet switched
Circuit switched
Bit switched
Entire band in United states is regulated by authorities.
FCC
ITU
NASA
ANSI
-------------- are used for multicast communication, such as radio and television.
Microwaves
Radio waves
Light waves
Infrared waves
To calculate the data rate foe noiseless channel formula is used-
Reedy
Shannon
Nyquist
propagation
In an analogue hierarchy to carry voice channels, a super group bandwidth.
240 kHz
240 Hz
120 kHz
60kHz
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