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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

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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

多項(xiàng)選擇題

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

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