多项选择题
A. multiple Frame Relay PVCs
B. dual Wan links to the regional office
C. dual Wan links to another branch office
D. single links - one to the regional office and one to another branch office
单项选择题 YouaretheCiscoNetworkDesignerinCisco.com.WhichoftheseisaLayer2transport architecturethatprovidespacket-basedtransmissionoptimizedfordatabasedonadualringtopology？（）
单项选择题 Whichtypicalenterprisecampusrequirementensuresthatthenetworksupportstherequired applicationsandthatdataflowswithintherequiredtimeframes？（）
单项选择题 CiscoExpressForwarding（CEF）ismainlyusedtoincreasepacketswitchingspeed，reducingtheoverheadanddelaysintroducedbyotherroutingtechniques，increasingoverallperformance.WhichofthefollowingconcerningCEFisrecommendedbyCisco？（）