CS601-Data Communication Solved MCQS

Question No: 1 ( Marks: 1 ) - Please choose one
Effective network mean that the network has fast delivery, timeliness and
Ø high bandwidth
Ø duplex transmission
Ø accurate transmission (P6)
Ø low bandwidth

Question No: 2 ( Marks: 1 ) - Please choose
A set of devices connected by communication links is called networking
Ø True (P12)
Ø False

Question No: 3 ( Marks: 1 ) - Please choose one
Which one best describes the given statement:
"To allow multiple users to share total capacity of a transmission medium"
Ø congestion control
Ø exchange management
Ø multiplexing (P17)

Question No: 4 ( Marks: 1 ) - Please choose one
Line configuration refers to the way two or more devices attach to a .
Ø Link (P25)
Ø Circuit
Ø Route
Ø Node

Question No: 5 ( Marks: 1 ) - Please choose one
requires the maximum number of I/O ports.
Ø Bus
Ø Star
Ø Mesh (P29)
Ø Ring

Question No: 6 ( Marks: 1 ) - Please choose one
is used to define the direction of the signal flow between the linked devices.
Ø transmission mode (P34)
Ø transmission method
Ø transmission impairments

Question No: 7 ( Marks: 1 ) - Please choose one
Unidirectional traffic movement is overcome by dual ring technology.
Ø True (P33)
Ø False

Question No: 8 ( Marks: 1 ) - Please choose one
Trailer is only added at layer of OSI model.
Ø Data link (P41)
Ø Physical
Ø Network
Ø Application

Question No: 9 ( Marks: 1 ) - Please choose one
Data link layer deals with mechanical and electrical specifications of transmission medium and
interface
Ø True (P44)
Ø False

Question No: 10 ( Marks: 1 ) - Please choose one
A signal that repeats a pattern over a regular interval of time is called .
Ø periodic signal (P58)
Ø analog signal
Ø composite signal

Question No: 11 ( Marks: 1 ) - Please choose one
If there is in voltage then the frequency is infinite.
Ø instantaneous change
Ø continuous change (P61)
Ø no change

Question No: 12 ( Marks: 1 ) - Please choose one
In a time-domain plot, the horizontal axis is measure of .
Ø signal amplitude
Ø frequency
Ø phase
Ø time (P63)

Question No: 13 ( Marks: 1 ) - Please choose
DC component is also termed as Direct current component or a component with non-zero
frequency.
Ø False (P72)
Ø True

Question No: 14 ( Marks: 1 ) - Please choose one
Quantization means measuring amplitudes of signal at equal intervals.
Ø True
Ø False (P80)

Question No: 15 ( Marks: 1 ) - Please choose one
Amplitude in ASK is more resistive to EMI and Noise.
Ø True (P87)
Ø False

Question No: 16 ( Marks: 1 ) - Please choose one
ASK, PSK, FSK and QAM are examples of modulation.
Ø digital-to-digital
Ø digital-to-analog (P85)
Ø analog-to-analog
Ø analog-to-digital

Question No: 17 ( Marks: 1 ) - Please choose one
The bit rate always equals the baud rate in which type of signal?
Ø FSK (P86)
Ø QAM
Ø 4-PSK
Ø PSK

Question No: 18 ( Marks: 1 ) - Please choose one
Asynchronous transmission is
Ø Slow (P99)
Ø costly
Ø non-effective
Ø fast

Question No: 19 ( Marks: 1 ) - Please choose one
A converts an analog signal into a digital signal.
Ø Demodulator (P110)
Ø Modulator
Ø Digital-to-analog converter

Question No: 20 ( Marks: 1 ) - Please choose one
If a station does not receive its signal up to a specified time that system issues an alarm to
Ø another node (P188)
Ø network manager
Ø switch
Ø network analyzer

Question No: 1 ( Marks: 1 ) - Please choose one
The information to be communicated in a data communications system is the
► Medium
► Protocol
► Message (P 7)
► Transmission

Question No: 2 ( Marks: 1 ) - Please choose one
Which is not an element of protocol
► semantics
► timing
► communication service module (P19)

Question No: 3 ( Marks: 1 ) - Please choose one
Line configuration refers to the way two or more devices attach to a ______.
► Link (P 25)
► Circuit
► Route
► Node

Question No: 4 ( Marks: 1 ) - Please choose one
_________requires the maximum number of I/O ports.
► Bus
► Star
► Mesh (P29)
► Ring

Question No: 5 ( Marks: 1 ) - Please choose one
Which topology requires a central controller or hub?
► Mesh
► Star (P 30)
► Bus
► Ring

Question No: 6 ( Marks: 1 ) - Please choose one
Layers 5, 6 and 7 also called as network support layers.
► True
► False (P 42)
Mc100401285 moaaz.pk@gmail.com
Question No: 7 ( Marks: 1 ) - Please choose one
Internet with small “i” specifies the world wide Network the actual internet.
► True
► False (P 39)

Question No: 8 ( Marks: 1 ) - Please choose one
Data link layer deals with mechanical and electrical specifications of transmission medium and interface
► True (P 44)
► False
Question No: 9 ( Marks: 1 ) - Please choose one
Data synchronization is a function related with ___________
► session layer (P 51)
► presentation layer
► transport
Question No: 10 ( Marks: 1 ) - Please choose one
OSI model was developed prior to TCP/IP model.
► True (P 54)
► False
Question No: 11 ( Marks: 1 ) - Please choose one
Fourier transform tells us that any digital signal can be decomposed into infinite number of periodic signals
► True
► False (P58)

Question No: 12 ( Marks: 1 ) - Please choose one
A signal that repeats a pattern over a regular interval of time is called_______.
► periodic signal (P58)
► analog signal
► composite signal

Question No: 13 ( Marks: 1 ) - Please choose one
Frequency band in which 99% of the total power resides is called_______
► power bandwidth (P 67)
► half power bandwidth
► 3dB bandwidth
► F.M.

Question No: 14 ( Marks: 1 ) - Please choose one
In differential Manchester we require two transition or signal changes to represent binary_____
► zero
► one (P76)
► both zero and one

Question No: 15 ( Marks: 1 ) - Please choose one
In Alternate mark inversion the term mark comes from_________
► telegraphy (P77)
► telephony
► digital telephony

Question No: 16 ( Marks: 1 ) - Please choose one
A 56k modem can download at a rate of __________ Kbps and upload at a rate of __________ Kbps.
► 33.6: 33.6
► 33.6: 56.6
► 56.6: 33.6
► 56.6: 56.6

Question No: 17 ( Marks: 1 ) - Please choose one
The bit rate always equals the baud rate in which type of signal?
► FSK (P 86)
► QAM
► 4-PSK
► PSK

Question No: 18 ( Marks: 1 ) - Please choose one
Asynchronous transmission is ___________
► slow (P 99)
► costly
► non-effective
► fast

Question No: 19 ( Marks: 1 ) - Please choose one

At the ______________layer, a DCE takes data generated by a DTE.
► physical (P 101)
► transport
► data link
► application

Question No: 20 ( Marks: 1 ) - Please choose one
_________ requires more bandwidth.
► FSK
► ASK (P 112)
► PSK
► QAM

Question No: 1 ( Marks: 1 ) - Please choose one
Which topology requires a central controller or hub?
► Mesh
► Star (P 30)
► Bus
► Ring
Question No: 2 ( Marks: 1 ) - Please choose one
Unidirectional traffic movement is overcome by dual ring technology.
► True (P33)
► False

Question No: 3 ( Marks: 1 ) - Please choose one
Which one best describes the given statement:
"To allow multiple users to share total capacity of a transmission medium"
► congestion control
► exchange management
► multiplexing (P17)

Question No: 4 ( Marks: 1 ) - Please choose one
Which one is not among standard creation committee.
► internet society and IETF (P 24)
► ITU-T
► IEEE

Question No: 5 ( Marks: 1 ) - Please choose one
Set of rules that govern communication is called
► OSI model
► Protocol (P 8)
► TCP/IP model
► Datagram

Question No: 6 ( Marks: 1 ) - Please choose one
Frequency of a failure and network recovery time after a failure is measures of the ____________ of a
network.
► Performance (P 14)
► Reliability
► Security
► Feasibility

Question No: 7 ( Marks: 1 ) - Please choose one
3dB is also called as power bandwidth.
► True
► False (P66)

Question No: 8 ( Marks: 1 ) - Please choose one
ASK, PSK, FSK and QAM are examples of ____________ modulation.
► digital-to-digital
► digital-to-analog (P85)
► analog-to-analog
► analog-to-digital

Question No: 9 ( Marks: 1 ) - Please choose one
Packet switching is a connection oriented service.
► True
► False (P38)

Question No: 10 ( Marks: 1 ) - Please choose one
Data synchronization is a function related with ___________
► session layer (P51)
► presentation layer
► transport

Question No: 11 ( Marks: 1 ) - Please choose one
Fourier transform tells us that any digital signal can be decomposed into infinite number of periodic signals
► True
► False (P 58)

Question No: 12 ( Marks: 1 ) - Please choose one
The internet model consists of _________ layers.
► three (P239)
► two
► five
► seven

Question No: 13 ( Marks: 1 ) - Please choose one
Analog to digital conversion is also termed as modulating an analog signal.
► True
► False (P 77)

Question No: 14 ( Marks: 1 ) - Please choose one
PCM is the first process of PAM.
► True
► False (P80)

Question No: 15 ( Marks: 1 ) - Please choose one
A modulator converts a(n) ____________ signal to a(n) ____________ signal.
► FSK: PSK
► Digital: analog (P 110)
► Analog: digital
► PSK: FSK

Question No: 16 ( Marks: 1 ) - Please choose one
The _______________ layer changes bits into electromagnetic signals.
► physical
► data link
► transport
► none of given

Question No: 17 ( Marks: 1 ) - Please choose one
We need ____________ to decompose a composite signal into its components.
► fourier transform (P 64)
► nyquist theorem
► shannon capacity

Question No: 18 ( Marks: 1 ) - Please choose one
The bit rate always equals the baud rate in which type of signal?
► FSK (P 86)
► QAM
► 4-PSK
► PSK

Question No: 19 ( Marks: 1 ) - Please choose one
There are _____ possible variations of 16 QAM.
► five
► two
► three (P93)
► four
Question No: 20 ( Marks: 1 ) - Please choose one
Number of signal units per second that are required to represent a bit is called bit rate.
► True
► False (P 68)

Please choose one ( Marks: 1 )
Effective network mean that the network has fast delivery, timeliness and
Ø high bandwidth
Ø duplex transmission
Ø accurate transmission (P6)
Ø low bandwidth

Question No: 2 ( Marks: 1 ) - Please choose one
A set of devices connected by communication links is called networking
Ø True (P12)
Ø False

Question No: 3 ( Marks: 1 ) - Please choose one
_______ is a multipoint topology.
Ø Ring
Ø Mesh
Ø Tree
Ø Bus

Question No: 4 ( Marks: 1 ) - Please choose one
_________requires the maximum number of I/O ports.
Ø Bus
Ø Star
Ø Mesh (P29)
Ø Ring

Question No: 5 ( Marks: 1 ) - Please choose one
Unidirectional traffic movement is overcome by dual ring technology.
Ø True (P33)
Ø False

Question No: 6 ( Marks: 1 ) - Please choose one
As the data packet moves from the lower to the upper layers, headers are
__________.
Ø added
Ø subtracted
Ø rearranged
Ø modified

Question No: 7 ( Marks: 1 ) - Please choose one
Data chunk at data link layer is called________
Ø frame
Ø packet (P38)
Ø datagram

Question No: 8 ( Marks: 1 ) - Please choose one
The _________ layer is the layer closest to the transmission medium.
Ø Physical (P45)
Ø data link
Ø network
Ø transport

Question No: 9 ( Marks: 1 ) - Please choose one
Data synchronization is a function related with ___________
Ø session layer (P 51)
Ø presentation layer
Ø transport

Question No: 10 ( Marks: 1 ) - Please choose one
Which layer is responsible for source to destination delivery of entire message?
Ø transport layer (P59)
Ø network layer
Ø session layer
Ø application layer

Question No: 11 ( Marks: 1 ) - Please choose one
Encryption and encoding are the same terms.
Ø True
Ø False (P52)

Question No: 12 ( Marks: 1 ) - Please choose one
TCP/IP model Application layer incorporate OSI Application and presentation
Ø layers
Ø True
Ø False

Question No: 13 ( Marks: 1 ) - Please choose one
A sine wave must be an analog signal.
Ø True (P58)
Ø False

Question No: 14 ( Marks: 1 ) - Please choose one
A periodic signal can always be decomposed into _____________
Ø exactly an odd number of sine waves
Ø a set of sine waves
Ø set of sine waves, one of the which must have a phase of 00
Ø none of the given (P58)

Question No: 15 ( Marks: 1 ) - Please choose one
Manchester is a type of ____________encoding.
Ø Biphase (P75)
Ø polar
Ø biphase & polar
Ø none of the given

Question No: 16 ( Marks: 1 ) - Please choose one
The powerful carrier signal is called as the___________
Ø carrier frequency (P86)
Ø base signal
Ø carrier frequency and base signal
Ø none of given

Question No: 17 ( Marks: 1 ) - Please choose one
Modulation of an analog signal can be accomplished through changing the ___________ of the carrier signal.
Ø amplitude
Ø frequency
Ø phase
Ø all of the given (P58)

Question No: 18 ( Marks: 1 ) - Please choose one
In _____________ transmission, bits are transmitted over a single wire, one at a time.
Ø Asynchronous serial
Ø Synchronous serial
Ø Parallel (P99)
Ø Asynchronous & Synchronous serial

Question No: 19 ( Marks: 1 ) - Please choose one
In RS 422 Balanced mode two lines carry ________ signals which are not identical to each other.
Ø Same (P109)
Ø different
Ø digital
Ø analog

Question No: 20 ( Marks: 1 ) - Please choose one
A ______________ converts an analog signal into a digital signal.
Ø Demodulator (P110)
Ø Modulator
Ø Digital-to-analog converter

Question No: 1 ( Marks: 1 ) - Please choose one
In RS 422 Balanced mode two lines carry signals which are not identical to each other.
► same (P109)
► different
► digital
► analog

Question No: 2 ( Marks: 1 ) - Please choose one
The generates the data and passes it along with any control information to a
.
► DTE; DCE (P 101)
► DCE; DTE
► DCE; node
► DTE; application

Question No: 3 ( Marks: 1 ) - Please choose one
In transmission, a start bit and a stop bit frame a character byte.
► Asynchronous serial (P99)
► Synchronous serial (P99)
► Parallel
► Asynchronous & Synchronous serial

Question No: 4 ( Marks: 1 ) - Please choose one
In transmission, bits are transmitted simultaneously, each across its own wire.
► Asynchronous serial
► Synchronous serial
► Parallel
► Asynchronous & Synchronous serial

Question No: 5 ( Marks: 1 ) - Please choose one
Asynchronous transmission is
► slow (P99)
► costly
► non-effective
► fast

Question No: 6 ( Marks: 1 ) - Please choose one
In transmission the timing of the signal is unimportant.
► Asynchronous (P99)
►Synchronous
►Polar
►Bi-polar

Question No: 7 ( Marks: 1 ) - Please choose one
In 8QAM each signal shift or one baud represents __________
► 4 bits
► 2 bits
► 5 bits
► 3 bits (P93)

Question No: 8 ( Marks: 1 ) - Please choose one
PCM is the first process of PAM.
► True
► False

Question No: 9 ( Marks: 1 ) - Please choose one
Bi phase encoding is a type of bipolar encoding in which we use two voltage levels.
► True (P73)
► False

Question No: 10 ( Marks: 1 ) - Please choose one
The amplitude of a digital signal depends upon the to represent a bit.
► phase
► voltage
► wavelength

Question No: 11 ( Marks: 1 ) - Please choose one
Time domain plot show changes in signal phase with respect to time.
► True
► False (P63)

Question No: 12 ( Marks: 1 ) - Please choose one
OSI model was developed prior to TCP/IP model.
► True
► False(P54)

Question No: 13 ( Marks: 1 ) - Please choose one
layer is the layer closest to the transmission medium.
► Physical (P45)
► Data link
► Network
► Transport

Question No: 14 (Marks: 1) - Please choose one
Data chunk at data link layer is called
►frame
►packet (P38)
►datagram

Question No: 15 ( Marks: 1 ) - Please choose one
The internet model consists of layers.
► Three (P239)
► Two
► Five
► Seven

Question No: 16 ( Marks: 1 ) - Please choose one
representation of links that connect nodes is called as physical topology.
► geometrical (P28)
►logical
►physical

Question No: 17 ( Marks: 1 ) - Please choose one
is a multipoint topology.
► Ring
► Mesh
► Tree
► Bus (P31)

Question No: 18 ( Marks: 1 ) - Please choose one
In mesh topology, if there are five nodes then there will be links.
► 5
► 10(P10)
► 15
► 20

Question No: 19 (Marks: 1) - Please choose one
Non proprietary standard is also termed as de facto standard.
► True (P23)
► False
Question No: 20 ( Marks: 1 ) - Please choose one
Effective network mean that the network has fast delivery, timeliness and
► high bandwidth
► duplex transmission
► accurate transmission (P6)
► low bandwidth

Question No: 1 (Marks: 1) - Please choose one
Frequency of a failure and network recovery time after a failure is measures of the ____________ of a
network.
Ø Performance (P 14)
Ø Reliability
Ø Security
Ø Feasibility

Question No: 2 (Marks: 1) - Please choose one
Secondary hub in a tree must be a passive hub.
Ø True (P31)
Ø False

Question No: 3 (Marks: 1) - Please choose one
In mesh topology, if there are five nodes then there will be _______ links.
Ø 5
Ø 10 (P29)
Ø 15
Ø 20

Question No: 4 (Marks: 1) - Please choose one
Internet with small “i” specifies the world wide Network the actual internet.
Ø True
Ø False (P39)

Question No: 5 (Marks: 1) - Please choose one
Data link layer deals with mechanical and electrical specifications of transmission
medium and interface
Ø True (P 44)
Ø False

Question No: 6 (Marks: 1) - Please choose one
When data are transmitted from device A to device B, the header from A’s layer 4
is read by B’s __________ layer.
Ø physical
Ø transport
Ø application
Ø none of the given

Question No: 7 (Marks: 1) - Please choose one
Time domain plot show changes in signal phase with respect to time.
Ø True
Ø False (63)

Question No: 8 (Marks: 1) - Please choose one
Frequency band in which 99% of the total power resides is called_______
Ø power bandwidth (P67)
Ø half power bandwidth
Ø F.M.

Question No: 9 (Marks: 1) - Please choose one
The inversion of the level at 1 bit is called as __________
Ø NRZ-L
Ø NRZ-I (P73)
Ø RZ

Question No: 10 (Marks: 1) - Please choose one
Which of the encoding schemes have bandwidth problems?
Ø Differential Manchester
Ø AMI (P77)
Ø RZ

Question No: 11 (Marks: 1) - Please choose one
Bi phase and bipolar are same terms.
Ø True
Ø False (P78)

Question No: 12 (Marks: 1) - Please choose one
Quantization means measuring amplitudes of signal at equal intervals.
Ø True
Ø False (P80)

Question No: 13 (Marks: 1) - Please choose one
The last process in PCM is _________ digital data into digital signal.
Ø Encoding (P70)
Ø decoding
Ø modulating

Question No: 14 (Marks: 1) - Please choose one
Which modulation technique involves tribits, eight different phase shifts, and one mplitude?
Ø FSK
Ø 8-PSK
Ø ASK
Ø 4-PSK

Question No: 15 (Marks: 1) - Please choose one
Asynchronous transmission is ___________
Ø slow (P99)
Ø costly
Ø non-effective
Ø fast

Question No: 16 (Marks: 1) - Please choose one
Synchronous transmission have _____________.
Ø a start bit
Ø a stop bit
Ø gaps between bytes
Ø none of the given (P99)

Question No: 17 (Marks: 1) - Please choose one Asynchronous transmission
The __________ generates the data and passes it along with any control
information to a ___________.
Ø DTE; DCE (P101)
Ø DCE; DTE
Ø DCE; node
Ø DTE; application

Question No: 18 (Marks: 1) - Please choose one
A human brain is considered as a ___________
Ø driver
Ø machine
Ø DTE (P101)
Ø DCE

Question No: 19 (Marks: 1) - Please choose one
The last modified version of EIA-232 standard is ______________
Ø EIA-232 D (P102)
Ø EIA-232 A
Ø EIA-232 B
Ø EIA-232 C

Question No: 20 (Marks: 1) - Please choose one
A ______________ converts an analog signal into a digital signal.
Ø Demodulator (P110)
Ø Modulator
Ø Digital-to-analog converter