You need to configure a new Company Catalyst 3560 switch for a VOIP-enabled office.
Which three statements are true about the voice VLAN feature on this switch? (Select three)

A.
The default CoS value for incoming traffic is set up to 0.

B.
The CoS value is trusted for 802.1p or 802.1q tagged traffic.

C.
PortFast is automatically disabled when a voice VLAN is configured.

D.
The voice VLAN feature is disabled by default.

E.
The IP phone accepts the priority of all tagged and untagged traffic and sets the CoS
value to 4.

F.
When the voice VLAN feature is enabled, all untagged traffic is sent according to the
default CoS priority of the port

Explanation:
Default Voice VLAN Configuration
The voice VLAN feature is disabled by default.
When the voice VLAN feature is enabled, all untagged traffic is sent according to the default
CoS priority of the port.
The default CoS value is 0 for incoming traffic.
The CoS value is not trusted for 802.1P or 802.1Q tagged traffic.
The IP Phone overrides the priority of all incoming traffic (tagged and untagged) and sets the
CoS value to 0.
Note: In software releases earlier than Cisco IOS Release 12.1(13)EA1, the CoS value is
trusted for all 802.1P or 802.1Q tagged traffic, and the IP Phone does not override the
priority of the incoming traffic.
Reference:
http://www.cisco.com/en/US/docs/switches/lan/catalyst2950/software/release/12.1_19_ea1/c
onfiguration/guide/swvoip.html