单项选择题
A. Dynamic Trunking Protocol
B. Resilient Packet Ring
C. Synchronous Digital Hierarchy
D. Coarse Wave Division Multiplexing
单项选择题 Whichtypicalenterprisecampusrequirementensuresthatthenetworksupportstherequired applicationsandthatdataflowswithintherequiredtimeframes？（）
单项选择题 CiscoExpressForwarding（CEF）ismainlyusedtoincreasepacketswitchingspeed，reducingtheoverheadanddelaysintroducedbyotherroutingtechniques，increasingoverallperformance.WhichofthefollowingconcerningCEFisrecommendedbyCisco？（）
多项选择题 Whichthreestatementsaboutfirewallmodesarecorrect？（）