Refer to the exhibit.

Which statement is true when voice traffic is forwarded on the same VLAN used by the data traffic?

A.
The voice traffic cannot be forwarded to the distribution layer.

B.
The voice traffic cannot use 802.1p priority tagging.

C.
Port security cannot be enabled on the switch that is attached to the IP phone.

D.
Quality of service cannot be applied for the voice traffic.

Explanation:
You can configure a port connected to the Cisco IP Phone to send CDP packets to the
phone to configure the way in which the phone sends voice traffic. The phone can carry
voice traffic in 802.1Q frames for a specified voice VLAN with a Layer 2 CoS value. It can
use 802.1P priority tagging to give voice traffic a higher priority and forward all voice traffic

through the native (access) VLAN. The IP phone can also send untagged voice traffic or use
its own configuration to send voice traffic in the access VLAN. In all configurations, the voice
traffic carries a Layer 3 IP precedence value (the default is 5).
If the Cisco IP Phone and a device attached to the Cisco IP Phone are in the same VLAN,
they must be in the same IP subnet. These conditions indicate that they are in the same
VLAN:
– They both use 802.1p or untagged frames.
– The Cisco IP Phone uses 802.1p frames and the device uses untagged frames.
– The Cisco IP Phone uses untagged frames and the device uses 802.1p frames.
– The Cisco IP Phone uses 802.1 Q frames and the voice VLAN is the same as the access
VLAN.
Reference:
http://www.cisco.com/en/US/products/hw/switches/ps5206/products_configuration_guide_ch
apter09186a00801a64ea.html