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
单项选择题 WhatistheeffectofchangingDMTinterleaveddelayfrom3millisecondsto15milliseconds？（）
单项选择题 Whengatewaysareregisteringwithagatekeeper，thegatekeepercanbe（）.
单项选择题 WhatistherelationshipbetweentheDomainNameSystem（DNS）andLDAP？（）
