WhichstatementdescribesthePFE?（）
A. ThePFEcontrolstheREbyprovidingLayer2andLayer3forwardingtables
B. ThePFEimplementsadvancedservicessuchaspolicing,statelessfirewallfiltering,andclassofservice
C. ThePFEsendstraffictotheREforsystematicpacketforwarding
D. ThePFEreceiveshardwareandenvironmentalstatusmessagesfromtheRE
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行政诉讼的举证责任原则是（）。
A. 谁主张谁举证
B. 被告举证
C. 原告举证
D. 控方举证
刑事诉讼的举证责任原则是（）。
A. 谁主张谁举证
B. 原告举证
C. 控方举证
D. 被告举证
WhichtwostatementsaretrueregardinganEthernetcollisiondomain?（）
A. Thelikelihoodofcollisionsoccurringincreaseswhenaswitchisused.
B. Thelikelihoodofcollisionsoccurringincreaseswhenahubisused.
C. Ifahubisused,thecollisiondomainislimitedtoeachdeviceandthehub.
D. Ifaswitchisused,thecollisiondomainislimitedtoeachdeviceandtheswitch.
InaPPPoverATMserviceoffering,whichtwomethodsareavailablefordynamicallyallocatinganIPaddresstothecustomer'sdevice?（）
A. DHCP
B. RADIUSserver
C. localaddresspools
D. staticIPassignmen
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