思科CCNA题目及答案

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1、CCNA-Cisco-Chapter11C11Anelectricianhasinvestigatedyourrecentpowerproblemsandhassuggestedthattheyarecausedbyoscillation.WhatistheBESTsolutiontoyourproblem?MovethenetworkservertoanotherroomReplaceUTPwithfiberopticcable*RewiretheelectricalsystemFitcommercialsurgesuppresso

2、rs2WhatisanothertermthatcanbeusedtodescribeanIntermediateDistributionFrame(IDF)?workarea(WA)telecommunicationsoutlet(TO)maincross-connect(MCC)*horizontalcross-connect(HCC)3Whyisfiberopticcablecommonlyusedasanetworkbackbonebetweencampusbuildings?Itprovidesalessresistivep

3、athforelectricalcurrenttoflowfromonebuildingtoanotherItenhancesthesignalsatthephysicallayer*ItreducesthehazardouseffectsofelectricalpotentialdifferenceandlightningstrikesItischeaperandeasiertoinstallthancopperwire4Whichofthefollowingenvironmentalspecificationsarerecomme

4、ndedforawiringcloset?Carpetedfloor;tiledwallsandaninwardopeningdoorWoodenfloor;brickwallsandfluorescentlightingTiledfloor;internalpoweroutletsandadroppedceiling*Raisedfloor;woodcoveredwallsandaninternallightswitch5Whatisoneofthemostsignificantcausesofoscillatorynoisepro

5、blemsonapowercircuit????LongwiringrunsSchoolphotocopiersLocatingpowercablesinelevatorshaftsAirconditionerscyclingonandoff6Whatdeviceisbestusedtominimizetheeffectsofpowerlinesagsandbrownouts?AprimaryprotectiondeviceAsurgesuppressorAnopticalisolator*Anuninterruptiblepower

6、supply7WhatcausesElectrostaticDischarge(ESD)?LongpowerlinesFaultyelectricalequipment*AnaccumulationofstaticelectricityAnincreaseinatmospherichumidity8Whichofthefollowingproblemsiscausedbytoohighahumiditylevelinawiringcloset?Signaldegradation*CopperwirecorrosionInsulatio

7、nfailurePowersurges9Whatistheidealroomtemperatureandrelativehumidityatwhichawiringclosetshouldbemaintained?*21degreesCelsius/45%relativehumidity21degreesFahrenheit/45%relativehumidity45degreesCelsius/21%relativehumidity45degreesFahrenheit/21%relativehumidity10Whatisthem

8、aximumlengthspecifiedfor62.5/125µmmultimodeopticalfiberrunbetweentheMDFandIDF?90m800m2000m*3000m11Whataretheth