多项选择题
What are two design guidelines for VoIP networks? （）
A.Delay should be no more than 10 ms.
B.Loss should be no more than1 percent.
C.Jitter should be less then 40 ms.
D.Managed bandwidth is strongly recommended for voice control traffic.
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WhichthreeoftheseareelementsoftheCiscoUnifiedWirelessNetworkarchitecture？（）
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
