What protocol does an IP phone use to learn the voice VLAN ID it should use for voice traffic？（）A、VTPB、802.1 qC、CDPD、Skinny Station Protocol
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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