A.cell phones B.remote access C.mobility services D.network management E.network unification F.network decentralization
单项选择题WhichoftheseisaLayer2transportarchitecturethatprovidespacket-basedtransmissionoptimizedfordatabasedonadual（counter-rotating）ringtopology？（）
A.DTP B.RPR C.SDH D.CWDM E.DWDM
单项选择题WhichoftheseLayer2accessdesignsdoesnotsupportVLANextensions？（）
A.FlexLinks B.loop-free U C.looped square D.looped triangle E.loop-free inverted U
单项选择题For acceptable voice calls, the packet error rate should be less than（）%
A.0.01 B.0.1 C.1 D.2.5
多项选择题What are three primary activities in the cycle of building an enterprise security strategy?（）
A. activity audit B. administration C. policy establishment D. technology implementation
多项选择题Which two of these are recommended practices with trunks? （）
A. use ISL encapsulation B. use 802.1q encapsulation C. set ISL to desirable and auto with encapsulation negotiate to support ILS protocol negotiation D. use VTP server mode to support dynamic propagation of VLAN information across the network E. set DTP to desirable and desirable with encapsulation negotiate to support DTP protocol negotiation.
