单项选择题

A.Dedicated lines for high security data transferB.Data……

Which benefit does digital subscriber line (DSL) systems for broadband access provide to the user?（）

A.Dedicated lines for high security data transfer
B.Data and audio signals that share the same communications infrastructure
C.Secure access to company extranet
D.Simple solution for high-quality digital video using coaxial cable

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多项选择题Which three are benefits of A virtualized data center solution over A typical implementation?（）

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B.more efficient routing
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D.more efficient power consumption
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A.Synchronizes password exchanges for call setup
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A.Content switch
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