What does the switch provide to the Cisco IP phone via Cisco Discovery Protocol when the IP phone power up?
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A.
voice VLAN ID (WID)
B.
native VLAN ID (NVID)
C.
priority VLAN (PVAN)
D.
IP address
Explanation:
IP Phones have a bootup sequence. The very first step in the sequence is to send a CDP message to discover the voice virtual LAN information from the switch. The IP Phone then sends a broadcast DHCP request and should receive an IP address, default gateway and TFTP server information. The IP Phone then requests a file from the TFTP server which includes, among other things, the IP address of the CME router. The IP Phone then sends a registration request to the CME router and subsequently receives the phone configuration from this router.