单项选择题
A. to provide service internetworking
B. to support transparency for Layer 2 frames
C. as a connection identifier to indicate destination
D. as a mapping to the DLCI in service internetworking
E. to provide a trunk by which all VLANs can navigate from one site to one or multiple sites
单项选择题 WhichuniquecharacteristicsoftheDataCenterAggregationlayermustbeconsideredbyan EnterpriseCampusdesigner？（）
单项选择题 WhendesigningtheNetworkAdmissionControl（NAC）AppliancefortheEnterpriseCampus Network，whichofthefollowingrequirementswouldhelpthedesignertonarrowdowntheNAC choices，fromVirtualGatewaytoRealIPGateway，orfromIn-bandtoOut-band？（）
多项选择题 WhataretwocharacteristicsofServerLoadBalancingroutermode？（）