单项选择题
Which of these is a Layer 2 transport architecture that provides packet-based transmission optimized for data based on a dual （counter-rotating） ring topology？（）
A.DTP
B.RPR
C.SDH
D.CWDM
E.DWDM
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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
