Refer to the exhibit.
Which statement is true about the voice traffic coming to the switch
access port that is connected to the IP phone?
A.
A PC connected to a switch port via an IP phone must support a trunking encapsulation.
B.
The traffic on the voice VLAN must be tagged with 802.1p encapsulation in order to
coexist on the same LAN segment with a PC.
C.
A PC connected to a switch port via an IP phone is unaware of the presence of the
phone.
D.
To improve the quality of the voice traffic, no other devices should be attached to the IP
phone.
E.
The voice VLAN must be configured as a native VLAN on the switch.
Explanation:
The new voice VLAN is called an auxiliary VLAN in the Catalyst software command-line
interface (CLI). In the traditional switched world, data devices reside in a data VLAN. The
new auxiliary VLAN is used to represent other types of devices collectively. Today those
devices are IP phones (hence the notion of a voice VLAN), but, in the future, other types of
non-data devices will also be part of the auxiliary VLAN. Just as data devices come up and
reside in the native VLAN (default VLAN), IP phones come up and reside in the auxiliary
VLAN, if one has been configured on the switch.
When the IP phone powers up, it communicates with the switch using CDP. The switch then
provides the phone with its configured VLAN ID (voice subnet), also known as the voice
VLAN ID or VVID. Meanwhile, data devices continue to reside in the native VLAN (or default
VLAN) of the switch. A data device VLAN (data subnet) is referred to as a port VLAN ID or
PVID.