When you enter the interface command auto qos voip cisco-phone on a port a the edge of a network, how does the Cisco catalyst switch detect if a Cisco IP Phone is connected to the port?
A.
By using DHCP snooping
B.
By Snooping the CoS marking on the incoming frames
C.
By using CDP
D.
By snooping the incoming 802.1Q VLAN tag
E.
By using RTP hello messages between the switch port and the Cisco IP Phone