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Chapter 1 c
Introduction to Data Communications
c c c
True-False Questions
c
ThecfollowingcarecpossiblecTrue/Falsecquestionscforctests.cThecstatementciscgivencandcthecanswercisc
providedcincsquarecbrackets.cTheclevelcofcdifficultyc(easy,cmoderate,cdifficult)candcthecpagecnumber
(s)crelevantctocthectopiccarecalsocfurnished.
1. AccordingctocJohncChambers,cCEOcofcCiscoc(acleadingcnetworkingctechnologyccompany),ct
hecinformationcageciscthecsecondcIndustrialcRevolution.
Answer:True Difficulty:cEasy Reference:c p.c4
2. Duectocrecentcadvancescinchighcspeedccommunicationcnetworks,cthecinformationclag,corcthecti
mecitctakescforcinformationctocbecdisseminatedcaroundcthecworld,chascbeencsignificantlycshor
tened.
Answer:True Difficulty:c Easy Reference:c p.4
3. Onecperspectivecofcdataccommunicationscandcnetworkingcascstatedcincthectextbook,cexaminesct
hecmanagementcofcnetworkingctechnologies,cincludingcsecurity,cnetworkcdesign,candcmanagi
ngcthecnetworkconcacday-to-daycbasiscandclongctermcbasis.
Answer:True Difficulty:c Moderate Reference:c p.c5
4. ThecfirstcelectroniccdataccommunicationcsystemcwascthectelephonecdevelopedcbycAlexanderc
GrahamcBell.
Answer:False Difficulty:cEasy Reference:c p.c5
5. Thecfirstctranscontinentalctelephonecservicecwascestablishedcincthec1940s.
Answer:False Difficulty:cEasy Reference:c p.c6
6. AncInter-
ExchangecCarrierc(IXC)cprovidesconlyclocalctelephonecservicesctochomescandcbusinesses
.
Answer:cFalse Difficulty:c Easy Reference:c p.c6
7. CommonccarrierscincludecthecRBOCs,cIXCs,candcCablecTVccompanies.
Answer:True Difficulty:cModerate Reference:c p.c7
8. ThecTelecommunicationscActcofc1996cnowcpermitscthecRBOCsctocprovideclongcdistanceco
utsidecthecregioncincwhichctheycprovideclocalctelephonecservices.
Answer:cTrue Difficulty:cModerate Reference:c p.c7
9. ThecInternetcwascstartedcbycthecU.S.cDepartmentcofcdefensecinc1969cascacnetworkcofcfourcc
omputersccalledcARPANET.
Answer:cTrue Difficulty:c Moderate Reference:c p.c9
10. Telecommunicationsciscthectransmissioncofcvoicecandcvideocascwellcascdatacandcimpliesctr
ansmittingcaclongercdistancecthancincacdataccommunicationcnetwork.
Answer:False Difficulty:cModerate Reference:c p.c11
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11. Aclocalcareacnetworkc(LAN)cconnectscothercLANscandcBNsclocatedcincdifferentcareasctoceachco
thercandctocwidecareacnetworkscincacspancfromc3ctoc30cmiles.
Answer:cFalse Difficulty:cModerate Reference:c p.c13
12. AncintranetciscacLANcthatcusescInternetctechnologiescandciscpubliclycavailablectocpeopleco
utsidecofcthecorganization.
Answer:cFalse Difficulty:cModerate Reference:c p.c15
13. Accarcmanufacturercmaycgivecaccessctoccertaincportionscofcitscnetworkctocsomecofcitscsupplierscv
iacInternet.cThisciscancexamplecofcancExtranet.
Answer:cTrue Difficulty:cModerate Reference:c p.c15
14. ThecOSIcmodelciscthecmostcwidelycusedcnetworkcmodelctocdevelopcandcbuildcnetworksctoday.
Answer:cTrue Difficulty:cModerate Reference:c p.c16
15. Thecnetworkclayerciscresponsiblecforcroutingcmessagescfromcthecsourceccomputerctocthecd
estinationccomputer.
Answer:cTrue Difficulty:cEasy Reference:c p.c17
16. IncthecOSIcmodel,cthecapplicationclayerciscthecendcuser’scaccessctocthecnetwork.
Answer:cTrue Difficulty:cModerate Reference:c p.c18
17. ThecapplicationclayerciscthecseventhclayercofcthecInternetcmodelcandcprovidescthecendcuser’sca
ccessctocthecnetwork.
Answer:cTrue Difficulty:cModerate Reference:c p.c18
18. AtcthectransportclayercincthecInternetcmodel,cTCPciscresponsiblecforcbreakingclargecfilescreceive
dcfromcthecapplicationclayercintocsmallercpacketscandcopeningcacconnectionctocacservercforctrans
ferringcthecpackets.
Answer:cTrue Difficulty:cDifficult Reference:c p.c17
19. Ethernetciscancexamplecofcacnetworkclayercprotocol.
Answer:cFalse Difficulty:cEasy Reference:c p.c17
20. Dataccommunicationcstandardscenableceachclayercincthecsendingccomputerctoccommunicatec
withcitsccorrespondingclayercincthecreceivingccomputer.
Answer:cTrue Difficulty:cEasy Reference:c p.c22
21. Thecspecificationcstagecofcthecformalcstandardizationcprocesscconsistscofcdevelopingcn
omenclaturecandcidentifyingcthecproblemsctocbecaddressed.
Answer:cTrue Difficulty:cModerate Reference:c p.c23
22. ANSIciscacvotingcparticipantcincthecISO.
Answer:cTrue Difficulty:cEasy Reference:c p.c23
23. Passivecopticalcnetworking,cackeyctrendcforcthecfuture,cmeanscthatcvirtuallycanyccomputercwillcb
ecablectoccommunicatecwithcanycotherccomputercincthecworld.
Answer:cFalse Difficulty:cModerate Reference:c p.c26
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24. Thechighcbandwidthcrequirementsc(highccommunicationscneeds)cforcvideochavecslowedcitsci
ntegrationcintoccomputercnetworks.
Answer:cTrue Difficulty:cModerate Reference:c p.c28
25. AncApplicationcServicecProviderc(ASP)cdevelopscacspecificcsystemcandccompaniescpurchaseco
rcrentcthecservicecwithoutcinstallingcthecsystemconctheircownccomputers.
Answer:cTrue Difficulty:cModerate Reference:c p.c29
MULTIPLE CHOICE c
Thecfollowingcarecpossiblecmultiple-
choicecquestionscforctests.cThecquestionciscposedcandcthecanswerciscprovidedcundercthecchoices.cThec
levelcofcdifficultyc(easy,cmoderate,cdifficult)candcthecpagecnumber(s)crelevantctocthectopicciscalsocfur
nished.
1. Dataccommunicationscandcnetworkingccancbecconsideredcascacglobalcareacofcstudycbecause:
a. newc technologiesc andc applicationsc emergec fromc ac varietyc ofc countriesc andc spreadca
roundcthecworld
b. thectechnologiescenablecglobalccommunication
c. thecpoliticalcandcregulatorycissuescarecexactlycthecsamecinceveryccountry
d. acandcb
e. nonecofcthecabove
Answer:cD Difficulty:cEasy Reference:c p.c4
2. Inc1970,cackeycdecisioncregardingcMCI:
a. setcupcthecTelecommunicationscCompetitioncandcDeregulationcAct
b. permittedcMCIctocprovideclimitedclongcdistancecservicecincthecU.S.
c. permittedctelephonecand/orccomputercequipmentcthatcwascnotcmanufacturedcbycBellcTe
lephonectocbecconnectedctocAT&T’scnetwork
d. dividedcAT&Tcintoctwocparts:conecpartcforclongcdistancecservice,candcacsecondcpart,cco
mprisedcofcsevencoperatingccompanies,cforclocalctelephonecservice
e. setcupcderegulationcforcinternationalctelecommunicationscmarketscinc68ccountries
Answer:cB Difficulty:cEasy Reference:c c p.c6
3. Inc1984,cacfederalcjudgecbrokecupcachighlyccontestedctelephonecservicecmonopolycand:
a. setcupcthecTelecommunicationscCompetitioncandcDeregulationcAct
b. permittedcMCIctocprovideclimitedclongcdistancecservicecincthecU.S.
c. permittedctelephonecand/orccomputercequipmentcthatcwascnotcmanufacturedcbycBe
llcTelephonectocbecconnectedctocAT&T’scnetwork
d. dividedcAT&Tcintoctwocparts:conecpartcforclongcdistancecservice,candcacsecondcpart
,ccomprisedcofcsevencregionalcoperatingccompanies,cforclocalctelephonecservice
e. setcupcderegulationcforcinternationalctelecommunicationscmarketscinc68ccountries
Answer:cD Difficulty:cEasy Reference:c p.c6
Chapter 1 c
Introduction to Data Communications
c c c
True-False Questions
c
ThecfollowingcarecpossiblecTrue/Falsecquestionscforctests.cThecstatementciscgivencandcthecanswercisc
providedcincsquarecbrackets.cTheclevelcofcdifficultyc(easy,cmoderate,cdifficult)candcthecpagecnumber
(s)crelevantctocthectopiccarecalsocfurnished.
1. AccordingctocJohncChambers,cCEOcofcCiscoc(acleadingcnetworkingctechnologyccompany),ct
hecinformationcageciscthecsecondcIndustrialcRevolution.
Answer:True Difficulty:cEasy Reference:c p.c4
2. Duectocrecentcadvancescinchighcspeedccommunicationcnetworks,cthecinformationclag,corcthecti
mecitctakescforcinformationctocbecdisseminatedcaroundcthecworld,chascbeencsignificantlycshor
tened.
Answer:True Difficulty:c Easy Reference:c p.4
3. Onecperspectivecofcdataccommunicationscandcnetworkingcascstatedcincthectextbook,cexaminesct
hecmanagementcofcnetworkingctechnologies,cincludingcsecurity,cnetworkcdesign,candcmanagi
ngcthecnetworkconcacday-to-daycbasiscandclongctermcbasis.
Answer:True Difficulty:c Moderate Reference:c p.c5
4. ThecfirstcelectroniccdataccommunicationcsystemcwascthectelephonecdevelopedcbycAlexanderc
GrahamcBell.
Answer:False Difficulty:cEasy Reference:c p.c5
5. Thecfirstctranscontinentalctelephonecservicecwascestablishedcincthec1940s.
Answer:False Difficulty:cEasy Reference:c p.c6
6. AncInter-
ExchangecCarrierc(IXC)cprovidesconlyclocalctelephonecservicesctochomescandcbusinesses
.
Answer:cFalse Difficulty:c Easy Reference:c p.c6
7. CommonccarrierscincludecthecRBOCs,cIXCs,candcCablecTVccompanies.
Answer:True Difficulty:cModerate Reference:c p.c7
8. ThecTelecommunicationscActcofc1996cnowcpermitscthecRBOCsctocprovideclongcdistanceco
utsidecthecregioncincwhichctheycprovideclocalctelephonecservices.
Answer:cTrue Difficulty:cModerate Reference:c p.c7
9. ThecInternetcwascstartedcbycthecU.S.cDepartmentcofcdefensecinc1969cascacnetworkcofcfourcc
omputersccalledcARPANET.
Answer:cTrue Difficulty:c Moderate Reference:c p.c9
10. Telecommunicationsciscthectransmissioncofcvoicecandcvideocascwellcascdatacandcimpliesctr
ansmittingcaclongercdistancecthancincacdataccommunicationcnetwork.
Answer:False Difficulty:cModerate Reference:c p.c11
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11. Aclocalcareacnetworkc(LAN)cconnectscothercLANscandcBNsclocatedcincdifferentcareasctoceachco
thercandctocwidecareacnetworkscincacspancfromc3ctoc30cmiles.
Answer:cFalse Difficulty:cModerate Reference:c p.c13
12. AncintranetciscacLANcthatcusescInternetctechnologiescandciscpubliclycavailablectocpeopleco
utsidecofcthecorganization.
Answer:cFalse Difficulty:cModerate Reference:c p.c15
13. Accarcmanufacturercmaycgivecaccessctoccertaincportionscofcitscnetworkctocsomecofcitscsupplierscv
iacInternet.cThisciscancexamplecofcancExtranet.
Answer:cTrue Difficulty:cModerate Reference:c p.c15
14. ThecOSIcmodelciscthecmostcwidelycusedcnetworkcmodelctocdevelopcandcbuildcnetworksctoday.
Answer:cTrue Difficulty:cModerate Reference:c p.c16
15. Thecnetworkclayerciscresponsiblecforcroutingcmessagescfromcthecsourceccomputerctocthecd
estinationccomputer.
Answer:cTrue Difficulty:cEasy Reference:c p.c17
16. IncthecOSIcmodel,cthecapplicationclayerciscthecendcuser’scaccessctocthecnetwork.
Answer:cTrue Difficulty:cModerate Reference:c p.c18
17. ThecapplicationclayerciscthecseventhclayercofcthecInternetcmodelcandcprovidescthecendcuser’sca
ccessctocthecnetwork.
Answer:cTrue Difficulty:cModerate Reference:c p.c18
18. AtcthectransportclayercincthecInternetcmodel,cTCPciscresponsiblecforcbreakingclargecfilescreceive
dcfromcthecapplicationclayercintocsmallercpacketscandcopeningcacconnectionctocacservercforctrans
ferringcthecpackets.
Answer:cTrue Difficulty:cDifficult Reference:c p.c17
19. Ethernetciscancexamplecofcacnetworkclayercprotocol.
Answer:cFalse Difficulty:cEasy Reference:c p.c17
20. Dataccommunicationcstandardscenableceachclayercincthecsendingccomputerctoccommunicatec
withcitsccorrespondingclayercincthecreceivingccomputer.
Answer:cTrue Difficulty:cEasy Reference:c p.c22
21. Thecspecificationcstagecofcthecformalcstandardizationcprocesscconsistscofcdevelopingcn
omenclaturecandcidentifyingcthecproblemsctocbecaddressed.
Answer:cTrue Difficulty:cModerate Reference:c p.c23
22. ANSIciscacvotingcparticipantcincthecISO.
Answer:cTrue Difficulty:cEasy Reference:c p.c23
23. Passivecopticalcnetworking,cackeyctrendcforcthecfuture,cmeanscthatcvirtuallycanyccomputercwillcb
ecablectoccommunicatecwithcanycotherccomputercincthecworld.
Answer:cFalse Difficulty:cModerate Reference:c p.c26
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24. Thechighcbandwidthcrequirementsc(highccommunicationscneeds)cforcvideochavecslowedcitsci
ntegrationcintoccomputercnetworks.
Answer:cTrue Difficulty:cModerate Reference:c p.c28
25. AncApplicationcServicecProviderc(ASP)cdevelopscacspecificcsystemcandccompaniescpurchaseco
rcrentcthecservicecwithoutcinstallingcthecsystemconctheircownccomputers.
Answer:cTrue Difficulty:cModerate Reference:c p.c29
MULTIPLE CHOICE c
Thecfollowingcarecpossiblecmultiple-
choicecquestionscforctests.cThecquestionciscposedcandcthecanswerciscprovidedcundercthecchoices.cThec
levelcofcdifficultyc(easy,cmoderate,cdifficult)candcthecpagecnumber(s)crelevantctocthectopicciscalsocfur
nished.
1. Dataccommunicationscandcnetworkingccancbecconsideredcascacglobalcareacofcstudycbecause:
a. newc technologiesc andc applicationsc emergec fromc ac varietyc ofc countriesc andc spreadca
roundcthecworld
b. thectechnologiescenablecglobalccommunication
c. thecpoliticalcandcregulatorycissuescarecexactlycthecsamecinceveryccountry
d. acandcb
e. nonecofcthecabove
Answer:cD Difficulty:cEasy Reference:c p.c4
2. Inc1970,cackeycdecisioncregardingcMCI:
a. setcupcthecTelecommunicationscCompetitioncandcDeregulationcAct
b. permittedcMCIctocprovideclimitedclongcdistancecservicecincthecU.S.
c. permittedctelephonecand/orccomputercequipmentcthatcwascnotcmanufacturedcbycBellcTe
lephonectocbecconnectedctocAT&T’scnetwork
d. dividedcAT&Tcintoctwocparts:conecpartcforclongcdistancecservice,candcacsecondcpart,cco
mprisedcofcsevencoperatingccompanies,cforclocalctelephonecservice
e. setcupcderegulationcforcinternationalctelecommunicationscmarketscinc68ccountries
Answer:cB Difficulty:cEasy Reference:c c p.c6
3. Inc1984,cacfederalcjudgecbrokecupcachighlyccontestedctelephonecservicecmonopolycand:
a. setcupcthecTelecommunicationscCompetitioncandcDeregulationcAct
b. permittedcMCIctocprovideclimitedclongcdistancecservicecincthecU.S.
c. permittedctelephonecand/orccomputercequipmentcthatcwascnotcmanufacturedcbycBe
llcTelephonectocbecconnectedctocAT&T’scnetwork
d. dividedcAT&Tcintoctwocparts:conecpartcforclongcdistancecservice,candcacsecondcpart
,ccomprisedcofcsevencregionalcoperatingccompanies,cforclocalctelephonecservice
e. setcupcderegulationcforcinternationalctelecommunicationscmarketscinc68ccountries
Answer:cD Difficulty:cEasy Reference:c p.c6
