Whatarethreephysicalinterfaceproperties?（）
A. payloadscrambling
B. virtualcircuitidentifier
C. FCS
D. linkspeed
E. IPaddress
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Whatarethreeadvantagesofdynamicroutingprotocolsoverstaticroutingprotocols?（）
A. loweradministrativeoverhead
B. increasednetworkavailability
C. greaternetworkscalability
D. easiertoimplementqualifiednexthops
E. easierECMProuteimplement
WhichtwostatementsarecorrectaboutLayer2broadcastframes?（）
A. Layer2broadcastframesareprocessedbyalldevicesonthesameVLAN
B. Layer2broadcastframesarearediscardedbyroutersthatconnecttomultipleVLANs
C. Layer2broadcastframesarerelayerdbyrouterstoallconnectedVLANs
D. Layer2broadcastframesarerelayedbyswitchestodevicesonthesameVLAN
Jill,atechnician,isinstallingseveralPCsinahomethatispre-wiredwithEthernettosevenrooms.InthewiringclosetalltheEthernetcablesarehangingfreeandarenotlabeled. Whichofthefollowingtoolswouldthetechnicianusetolocatethecablethatrunstoeachroom?（）
A. Extensionmagnet
B. Tonerprobe
C. Multimeter
D. OpticalTimeDomainReflectometer(OTDR)
以下属于离散变量的是（）。
A. 企业数
B. 产品数量
C. 年龄
D. 温度
E. 零件尺寸的误差
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