Chapter 4 Questions – Panko

《Chapter 4 Questions – Panko》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、Chapter7Questions–WideAreaNetworks(WANs)1.WANsoftenusethetransmissionlinesoftelephonecompanies.a.Trueb.FalseReference:p.2082.WhichofthefollowingisNOToneofthebasictechnologiesortechniquesnormallyusedtoconstructaWAN?a.Ordinarytelephonelinesandtelephonemodemsb.Ameshofleasedlinesc.UseofaPSD

2、Nd.AVPNe.AmeshofroutersandcodecsReference:p.2083.MostWANsoperateatspeedslowerthanLANspeeds.a.Trueb.FalseReference:p.2094.SinceWANscoveralargerareathanLANs,WANstypicallyoperateathigherspeedsthanLANs.a.Trueb.FalseReference:p.2095.Ifyouhad3Megabytesofdatathatyouwantedtosendtoafardistantloc

3、ationonceaday,themosteconomicalwaytolinkthetwositesinaWANwouldbetouse:a.framerelay.b.aVPN.c.ordinarytelephonelinesandtelephonemodems.d.alow-speedleasedline.Reference:p.2096.TheV.92standardstandardizes____.a.ModemonHold10b.Thepossibilityoftransmitting(sending)fasterthan33.6kbpsc.Bothofth

4、eabove.d.Neithera.norb.Reference:p.2117.Asymmetricmodemstandardsshouldbeusedwhen:a.themodemiscapableofperformingcompression.b.themodemiscapableofperformingerrordetectionandcorrection.c.thedownstreamtransmissionspeedshouldbehigherthantheupstreamspeed.d.Alloftheabove.Reference:p.2108.TheV

5、.34standard:a.requiresthatupstreamanddownstreamtransmissionspeedsareequal,butmaybothchangebaseduponlineconditions.b.requiresthatupstreamanddownstreamtransmissionspeedsarebothfixedat33.6kbps.c.allowsdownstreamtransmissionspeedstoexceedupstreamspeedswhenlineconditionspermit.d.beginstransm

6、ittingandreceivingat33.6kbpsandincreasesthespeedbaseduponlineconditions.e.beginstransmittingandreceivingat56kbpsandincreasesthespeedbaseduponlineconditions.Reference:p.2109.BothpartieshaveV.90modems.Howfastcantheysendfilestoeachother?a.33.6kbpsb.56kbpsReference:p.21110.Onedisadvantageof

7、usingaV.90modemtocommunicateisthat:a.theserviceisonlyavailableinlargercities.b.for56kbpsreceiving,thepartyattheotherendmusthaveadigitalconnectionandspecialequipmenttocommunicatewithyou.c.mostISPsdonotsupporttheV.90standardforcommunications.d.youcannotcommunicatewithV.34standard