(Please Note All

(Please Note All the Correct Answers Are Marked As the Correct Answers Are Marked As BOLD BOLD ⁾⁾

CHAPTER 1 CHAPTER 1

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

a. ProtocolProtocol b. Medium b. Medium c.

c. SignalSignal d.

d. All All the the aboveabove

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

a. ediumedium b.

b. ProtocolProtocol c. Message c. Message d.

d. TransmissionTransmission

"re#uency of failure and networ$ recovery time after a failure measured as the _______ of a networ$.

%A& & PePerfrforormamancnce e %'%'& & SSececururitityy %(%(& & )e)eliliababililitity y %*%*& & "e"easasibibililitityy

+: An unauthori,ed user is a networ$ _______ issue.

a. PerformancePerformance b.

b. )eliability)eliability c. Security c. Security d.

d. All All the the aboveabove

-: hich topology re#uires a central controller or hub/

a. eshesh b.

b. Star Star c.

c. 'us'us d.

d. )ing)ing

0: hich topology re#uires a multipoint connection/

a. eshesh

12: 7n the original A)PA9T8 _______ were directly connected together.

a. IMPsIMPs b.

b. host host computerscomputers c.

c. networ$snetwor$s d.

d. routersrouters

1!: This was the first networ$.

a. (S9T(S9T b.

b. 9S"9T9S"9T c.

c. A9S9TA9S9T d. ARPANE

d. ARPANE

1+: hich organi,ation has authority over interstate and international commerce in the communications 1+: hich organi,ation has authority over interstate and international commerce in the communications field/

d. 7S<(7S<(

1-: _______ are specialinterest groups that #uic$ly test8 evaluate8 and standardi,e new technologies.

a. !orums a. !orums b.

b. )egulatory )egulatory agenciesagencies c.

c. Standards Standards organi,ationsorgani,ations d.

d. All All of of the the aboveabove

10: hich agency developed standards for physical connection interfaces and electronic signaling 10: hich agency developed standards for physical connection interfaces and electronic signaling specifications/

c. A9S7A9S7 d.

d. 7S<7S<

1: _______ is the protocol suite for the current 7nternet.

a. "P#IP

14: _______ refers to the structure or format of the data8 meaning the order in which they are presented.

a. Semantics b. Syntax c. Timing

d. All of the above

15: ________ defines how a particular pattern to be interpreted8 and what action is to be ta$en based on that interpretation.

a. Semantics b. Synta3 c. Timing

d. 9one of the above

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

a. Semantics b. Synta3 c. iming

d. none of the above

21: *ata flow between two devices can occur in a _______ way.

a. simple3 b. halfduple3 c. fullduple3

d. all of t$e abo%e

22: 7n a ______ connection8 two and only two devices are connected by a dedicated lin$.

a. multipoint b. point-to-point c. %a& and %b&

d. none of the above

2!: 7n a ________ connection8 three or more devices share a lin$.

a. multipoint b. pointtopoint c. %a& and %b&

d. none of the above

2+: ______ refers to the physical or logical arrangement of a networ$.

a. *ata flow

b. ode of operation c. opology

d. 9one of the above

2-: *evices may be arranged in a _____ topology.

a. mesh b. ring c. bus

d. all of t$e abo%e

20: A _______ is a data communication system within a building8 plant8 or campus8 or between nearby buildings.

a. A9 b. &AN c. A9

d. none of the above

2: A ______ is a data communication system spanning states8 countries8 or the whole world.

a. A9 b. >A9 c. 'AN

d. none of the above

24: ________ is a collection of many separate networ$s.

a. A A9 b. internet c. a >A9

d. 9one of the above

25: There are ______________ 7nternet service providers.

a. local b. regional

c. national and international d. all of t$e abo%e

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

a. forum b. protocol c. standard

d. none of the above

!1: ________ is an idea or concept that is a precursor to an 7nternet standard.

a. )("

b. R!"

c. 7*

d. none of the above

CHAPTER 2

1: The 7nternet model consists of _______ layers.

a. Three b. !i%e c. Seven d. ight

2: The processtoprocess delivery of the entire message is the responsibility of the _______ layer.

a. 9etwor$

b. ransport c. Application d. Physical

!: The _______ layer is the layer closest to the transmission medium.

a. P$ysical b. *ata lin$

c. 9etwor$

d. Transport

+: ail services are available to networ$ users through the _______ layer.

a. *ata lin$

b. Physical c. Transport d. Application

-: As the data pac$et moves from the upper to the lower layers8 headers are _______.

a. Added b. )emoved c. )earranged d. odified

0: The _______ layer lies between the networ$ layer and the application layer.

a. Physical b. *ata lin$

c. ransport

d. 9one of the above

: >ayer 2 lies between the physical layer and the _______ layer.

a. Net(or) b. *ata lin$

c. Transport

d. 9one of the above

4: hen data are transmitted from device A to device '8 the header from A?s layer + is read by '?s _______ layer.

a. Physical b. ransport c. Application

d. 9one of the above

5: The _______ layer changes bits into electromagnetic signals.

a. P$ysical b. *ata lin$

c. Transport

d. 9one of the above

16: hich of the following is an application layer service/

a. )emote login

b. "ile transfer and access c. ail service

d. All t$e abo%e

11: hy was the <S7 model developed/

a. anufacturers disli$ed the T(P@7P protocol suite.

b. The rate of data transfer was increasing e3ponentially

c. Standards (ere needed to allo( any t(o systems to communicate d. 9one of the above

12: The _______ model shows how the networ$ functions of a computer ought to be organi,ed.

a. ((7TT b. *SI c. 7S<

d. A9S7

1!: The physical layer is concerned with the movement of _______ over the physical medium.

a. programs b. dialogs c. protocols d. bits

1+: The <S7 model consists of _______ layers.

a. three b. five c. se%en d. eight

1-: 7n the <S7 model8 as a data pac$et moves from the lower to the upper layers8 headers are _______.

a. added b. remo%ed c. rearranged d. modified

10: 7n the <S7 model8 when data is transmitted from device A to device '8 the header from A?s layer - is read by '?s _______ layer.

a. physical b. transport c. session d. presentation

1: 7n the <S7 model8 what is the main function of the transport layer/

a. nodetonode delivery

b. process-to-process message deli%ery c. synchroni,ation

d. updating and maintenance of routing tables

14: 7n the <S7 model8 encryption and decryption are functions of the ________ layer.

a. transport b. session

c. presentation d. application

15: hen a host on networ$ A sends a message to a host on networ$ '8 which address does the router loo$ at/

a. port b. logical c. physical

d. none of the above

26: To deliver a message to the correct application program running on a host8 the _______ address must be consulted.

a. port b. 7P

c. physical

d. none of the above

21: 7Pv0 has _______ bit addresses.

a. !2 b. 0+

c. +,

d. variable

22: 7(Pv0 includes _______.

a. 7P b. A)P c. )A)P d. a and b

2!: The ______ layer is responsible for moving frames from one hop %node& to the ne3t.

a. physical b. data lin) c. transport

d. none of the above

2+: The ______ layer adds a header to the pac$et coming from the upper layer that includes the logical addresses of the sender and receiver.

a. physical b. data lin$

c. net(or)

d. none of the above

2-: The_________ layer is responsible for the delivery of a message from one process to another.

a. physical b. transport c. networ$

d. none of the above

20: The 7nternetwor$ing Protocol %7P& is a ________ protocol.

a. reliable

b. connectionoriented c. both a and b

d. none of t$e abo%e

2: _______ is a processtoprocess protocol that adds only port addresses8 chec$sum error control8 and length information to the data from the upper layer.

a. T(P b. /P c. 7P

d. none of the above

24: __________ provides full transport layer services to applications.

a. "P b. ;*P c. A)P

d. none of the above

25: The ________ address8 also $nown as the lin$ address8 is the address of a node as defined by its

>A9 or A9.

a. port b. p$ysical c. logical

d. none of the above

!6: thernet uses a ______ physical address that is imprinted on the networ$ interface card %97(&.

a. !2bit b. 0+bit c. 0-byte

d. none of the above

!1: A port address in T(P@7P is ______ bits long.

a. !2 b. +4 c. +0

d. none of the above

!2: The ____ created a model called the <pen Systems 7nterconnection8 which allows diverse systems to communicate.

a. <S7 b. IS*

c. 7

d. none of the above

!!: The sevenlayer _____ model provides guidelines for the development of universally compatible networ$ing protocols.

a. *SI b. 7S<

c. 7

d. none of the above

!+: The physical8 data lin$8 and networ$ layers are the ______ support layers.

a. user b. net(or)

c. both %a& and %b&

d. neither %a& nor %b&

!-: The session8 presentation8 and application layers are the ____ support layers.

a. user b. networ$

c. both %a& and %b&

d. neither %a& nor %b&

!0: The _______ layer lin$s the networ$ support layers and the user support layers.

a. transport b. networ$

c. data lin$

d. session

!: The _______ layer coordinates the functions re#uired to transmit a bit stream over a physical medium.

a. transport b. networ$

c. data lin$

d. p$ysical

!4: The _______ layer is responsible for delivering data units from one station to the ne3t without errors.

a. transport b. networ$

c. data lin) d. physical

!5: The ______ layer is responsible for the sourcetodestination delivery of a pac$et across multiple networ$ lin$s.

a. transport b. net(or) c. data lin$

d. physical

+6: The ________ layer is responsible for the processtoprocess delivery of the entire message.

a. transport b. networ$

c. data lin$

d. physical

+1: The ______ layer establishes8 maintains8 and synchroni,es the interactions between communicating devices.

a. transport b. networ$

c. session d. physical

+2: The _______ layer ensures interoperability between communicating devices through transformation of data into a mutually agreed upon format.

a. transport b. networ$

c. data lin$

d. presentation

+!: The _________ layer enables the users to access the networ$.

a. transport b. application c. data lin$

d. physical

++: T(P@7P is a ______ hierarchical protocol suite developed ____ the <S7 model.

a. sevenlayerB before b. fi%e-layer1 before c. si3layerB before d. fivelayerB after

+-: The T(P@7P _______ layer is e#uivalent to the combined session8 presentation8 and application layers of the <S7 model.

a. application b. networ$

c. data lin$

d. physical

+0: The ________ address8 also $nown as the lin$ address8 is the address of a node as defined by its

>A9 or A9.

a. p$ysical

b. 7P c. port d. specific

+: The ____ address uni#uely defines a host on the 7nternet.

a. physical b. IP

c. port d. specific

+4: The_____ address identifies a process on a host.

a. physical b. 7P

c. port d. specific

"2APER 3

1: 'efore data can be transmitted8 they must be transformed to ________.

a. periodic signals

b. electromagnetic signals c. aperiodic signals

d. lowfre#uency sine waves

2: A periodic signal completes one cycle in 6.661 s. hat is the fre#uency/

a. 1 C, b. 166 C, c. + 425 d. 1 C,

!: 7n a fre#uencydomain plot8 the hori,ontal a3is measures the ________.

a. pea$ amplitude b. fre6uency c. phase d. slope

+: 7n a timedomain plot8 the hori,ontal a3is is a measure of ________.

a. signal amplitude b. fre#uency

c. phase d. time

-: 7f the bandwidth of a signal is - DC, and the lowest fre#uency is -2 DC,8 what is the highest fre#uency/

a. - DC, b. 16 DC, c. + DC, d. 78 425

0: hat is the bandwidth of a signal that ranges from 1 C, to + C,/

a. + C, b. 1 DC, c. 3 M25

d. none of the above

: As fre#uency increases8 the period ________.

a. decreases b. increases

c. remains the same d. doubles

4: iven two sine waves EiFAE@iF and EiF'E@iF8 if the fre#uency of EiFAE@iF is twice that of EiF'E@iF8 then the period of EiF'E@iF is ________ that of EiFAE@iF.

a. onehalf b. t(ice

c. the same as

d. indeterminate from

5: A sine wave is ________.

a. periodic and continuous b. aperiodic and continuous c. periodic and discrete d. aperiodic and discrete

16: 7f the ma3imum amplitude of a sine wave is 2 G8 the minimum amplitude is ________ G.

a. 2 b. 1 c. -,

d. between 2 and 2

11: A signal is measured at two different points. The power is EiFPE@iFEsubF1E@subF at the first point and

EiFPE@iFEsubF2E@subF at the second point. The d' is 6. This means ________.

a. EiFPE@iFEsubF2E@subF is ,ero

b. 9i:P9#i:9sub:,9#sub: e6uals 9i:P9#i:9sub:+9#sub:

c. EiFPE@iFEsubF2E@subF is much larger than EiFPE@iFEsubF1E@subF d. EiFPE@iFEsubF2E@subF is much smaller than EiFPE@iFEsubF1E@subF

12: ________ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium.

a. Attenuation b. *istortion c. 9oise d. *ecibel

1!: ________ is a type of transmission impairment in which the signal loses strength due to the different propagation speeds of each fre#uency that ma$es up the signal.

a. Attenuation b. /istortion c. 9oise d. *ecibel

1+: ________ is a type of transmission impairment in which an outside source such as crosstal$ corrupts a signal.

a. Attenuation b. *istortion c. Noise d. *ecibel

1-: hen propagation speed is multiplied by propagation time8 we get the ________.

a. throughput

b. wavelength of the signal c. distortion factor

d. distance a signal or bit $as tra%eled

10: *ata can be ________.

a. analog b. digital c. ;a< or ;b<

d. none of the above

1: _______ data are continuous and ta$e continuous values.

2+: _______ describes the position of the waveform relative to time 6.

a. "re#uency b. P$ase c. Amplitude d. Goltage

2-: A sine wave in the ______ domain can be represented by one single spi$e in the _____ domain.

a. time1 fre6uency b. fre#uencyB time c. timeB phase d. phaseB time

20: A _________ sine wave is not useful in data communicationsB we need to send a _______ signal.

a. compositeB singlefre#uency b. single-fre6uency1 composite c. singlefre#uencyB doublefre#uency d. none of the above

2: The _____ of a composite signal is the difference between the highest and the lowest fre#uencies contained in that signal.

a. fre#uency b. period c. band(idt$

d. amplitude

24: A%n&_________ signal is a composite analog signal with an infinite bandwidth.

a. digital b. analog

c. either %a& or %b&

d. neither %a& nor %b&

25: 'aseband transmission of a digital signal is possible only if we have a ____ channel.

a. lo(-pass b. bandpass c. low rate d. high rate

!6: 7f the available channel is a ____ channel8 we cannot send a digital signal directly to the channel.

a. lowpass b. bandpass c. low rate d. high rate

!1: "or a ______ channel8 the 9y#uist bit rate formula defines the theoretical ma3imum bit rate.

a. noisy b. noiseless c. bandpass d. lowpass

!2: "or a ______ channel8 we need to use the Shannon capacity to find the ma3imum bit rate.

a. noisy b. noiseless c. bandpass d. lowpass

!!: _________ can impair a signal.

a. Attenuation b. *istortion c. 9oise

d. All of t$e abo%e

!+: The _________ product defines the number of bits that can fill the lin$.

a. bandwidthperiod b. fre#uencyamplitude c. band(idt$-delay d. delayamplitude

"2APER =

1: ;nipolar8 bipolar8 and polar encoding are types of _______ encoding.

a. line b. bloc$

c. 9)H

d. anchester

2: _______ encoding has a transition at the middle of each bit.

a. )H

b. anchester

c. *ifferential anchester d. All t$e abo%e

!: _______ encoding has a transition at the beginning of each 6 bit.

a. )H

b. anchester

c. /ifferential Manc$ester d. All the above

+: P( is an e3ample of _______ conversion.

a. digitaltodigital b. digitaltoanalog c. analogtoanalog d. analog-to-digital

-: 7f the fre#uency spectrum of a signal has a bandwidth of -66 C, with the highest fre#uency at 066 C,8 what should be the sampling rate8 according to the 9y#uist theorem/

a. 266 samples@s b. -66 samples@s c. 1666 samples@s d. +,>> samples#s

0: The 9y#uist theorem specifies the minimum sampling rate to be_______.

a. e#ual to the lowest fre#uency of a signal b. e#ual to the highest fre#uency of a signal c. twice the bandwidth of a signal

d. t(ice t$e $ig$est fre6uency of a signal

: hich of the following encoding methods does not provide for synchroni,ation/

a. NR?-&

b. )H c. 9)H7

d. anchester

4: hich encoding method uses alternating positive and negative values for 1s/

a. 9)H7 b. )H

c. anchester d. AMI

5: hich #uanti,ation level results in a more faithful reproduction of the signal/

a. 2 b. 4 c. 10 d. 3,

16: 'loc$ coding can help in _______ at the receiver.

a. Synchroni,ation b. rror detection c. Attenuation d. ;a< and ;b<

11: 7n _______ transmission8 bits are transmitted simultaneously8 each across its own wire.

a. Asynchronous serial b. Synchronous serial c. Parallel

d. %a& and %b&

12: 7n _______ transmission8 bits are transmitted over a single wire8 one at a time.

a. asynchronous serial b. synchronous serial c. parallel

d. ;a< and ;b<

1!: 7n _______ transmission8 a start bit and a stop bit frame a character byte.

a. async$ronous serial b. synchronous serial c. parallel

d. %a& and %b&

1+: 7n asynchronous transmission8 the gap time between bytes is _______.

a. fi3ed b. %ariable

c. a function of the data rate d. ,ero

1-: ___________ conversion involves three techni#ues: line coding8 bloc$ coding8 and scrambling.

a. Analogtodigital b. *igitaltoanalog c. Analogtoanalog d. /igital-to-digital

10: ________ is the process of converting digital data to a digital signal.

a. 'loc$ coding b. &ine coding c. Scrambling

d. 9one of the above

1: _______ provides redundancy to ensure synchroni,ation and inherent error detection.

a. Bloc) coding b. >ine coding c. Scrambling

d. 9one of the above

14: ________ is normally referred to as EiFm'@n'E@iF codingB it replaces each EiFmE@iFbit group with an EiFnE@iFbit group.

a. Bloc) coding b. >ine coding c. Scrambling

d. 9one of the above

15: ________ provides synchroni,ation without increasing the number of bits.

a. Scrambling b. >ine coding c. 'loc$ coding

d. 9one of the above

26: Two common scrambling techni#ues are ________.

a. 9)H and )H b. A7 and 9)H c. B?S and 2/B3

d. anchester and differential anchester

21: The most common techni#ue to change an analog signal to digital data is called __________.

a. PA>

b. P"M c. sampling

d. none of the above

22: The first step in P( is ________.

a. #uanti,ation b. modulation c. sampling

d. none of the above

2!: There are three sampling methods: __________.

a. #uanti,ed8 sampled8 and ideal b. ideal8 sampled8 and flattop c. ideal@ natural@ and flat-top d. none of the above

2+: ______ finds the value of the signal amplitude for each sampleB ____ finds the change from the

previous sample.

2-: hile there is %are& only _____ way%s& to send parallel data8 there is %are& three subclass%es& of serial 2-: hile there is %are& only _____ way%s& to send parallel data8 there is %are& three subclass%es& of serial transmission.

transmission.

a. oneB oneB twotwo b.

b. twoB twoB threethree c. one1 t$ree c. one1 t$ree d.

d. none none of of the the aboveabove

20: 7n ______ transmission8 we send 1 start bit %6& at the beginning and 1 or more stop bits %1s& at the 20: 7n ______ transmission8 we send 1 start bit %6& at the beginning and 1 or more stop bits %1s& at the end of each byte.

end of each byte.

a. synchronoussynchronous b. async$ronous b. async$ronous c.

c. isochronousisochronous d.

d. none none of of the the aboveabove

2: 7n _________ transmission8 we send bits one after another without start or stop bits or gaps. 7t is the 2: 7n _________ transmission8 we send bits one after another without start or stop bits or gaps. 7t is the responsibility of the receiver to group the bits.

responsibility of the receiver to group the bits.

a. sync$ronous a. sync$ronous b.

b. asynchronousasynchronous c.

c. isochronousisochronous d.

d. none none of of the the aboveabove

24: The ________ mode provides synchroni,ation for the entire stream of bits must. 7n other words8 it 24: The ________ mode provides synchroni,ation for the entire stream of bits must. 7n other words8 it guarantees that the data arrive at a fi3ed rate.

guarantees that the data arrive at a fi3ed rate.

a. synchronoussynchronous b.

b. asynchronousasynchronous c. isoc$ronous c. isoc$ronous d.

d. none none of of the the aboveabove

25: A _________ digital signal includes timing information in the data being transmitted.

a. self-sync$roni5ing a. self-sync$roni5ing b.

b. selfmodulatedselfmodulated c.

c. selftransmiselftransmittedtted d.

d. none none of of the the aboveabove

!6: 7n decoding a digital signal8 the receiver calculates a running average of the received signal power8

!6: 7n decoding a digital signal8 the receiver calculates a running average of the received signal power8 called the _______.

called the _______.

a. baseline a. baseline b.

b. basebase c.

c. lineline d.

d. none none of of the the aboveabove

!1: The ________ rate defines the number of data elements sent in 1sB the ______ rate is the number of

!1: The ________ rate defines the number of data elements sent in 1sB the ______ rate is the number of signal elements sent in 1s.

signal elements sent in 1s.

a. data1 signal a. data1 signal b.

b. signalB signalB datadata c.

c. baudB baudB bitbit d.

d. none none of of the the aboveabove

!2: The signal rate is sometimes called the ____ rate.

a. baud a. baud b.

b. bitbit c.

c. signalsignal d.

d. none none of of the the aboveabove

!!: The data rate is sometimes called the ___ rate.

a. baudbaud b. bit b. bit c.

c. signalsignal d.

d. none none of of the the aboveabove

!+: 7n a _____ scheme8 all the signal levels are on one side of the time a3is8 either above or below.

In document Fourozan MCQ From 4th Edition (Page 113-188)

(Please Note All the Correct Answers Are Marked As the Correct Answers Are Marked As BOLD BOLD ))

CHAPTER 1 CHAPTER 1

CHAPTER 2

"2APER 3

"2APER =

(Please Note All the Correct Answers Are Marked As the Correct Answers Are Marked As BOLD BOLD ⁾⁾