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單項(xiàng)選擇題

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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單項(xiàng)選擇題

Which of these Layer 2 access designs does not support VLAN extensions？（）

A.FlexLinks
B.loop-free U
C.looped square
D.looped triangle
E.loop-free inverted U

單項(xiàng)選擇題

For acceptable voice calls, the packet error rate should be less than（）%

A.0.01
B.0.1
C.1
D.2.5