单项选择题

What protocol does an IP phone use to learn the voice VLAN ID it should use for voice traffic？（）

A.VTP
B.802.1 q
C.CDP
D.Skinny Station Protocol

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What is the effect of changing DMT interleaved delay from 3 milliseconds to 15 milliseconds？（）

A.Latency remains the same， but throughput is decreased.
B.Latency remains the same， but error correction effectives may also be reduced.
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D.Fewer ATM PVCs can be provisioned on DSL line.

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A.On the same subnet
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单项选择题

What is the relationship between the Domain Name System （DNS） and LDAP？（）

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D.It is currently recommended to express DN as a sequence of Domain components.