During the implementation of a voice solution, which two required items are configured at an access layer switch that will be connected to an IP phone to provide VoIP communication? (Choose two.)
A. allowed codecs
B. untagged VLAN
C. auxiliary VLAN
D. Cisco Unified Communications Manager IP address
E. RSTP
Correct Answer: BC
Explanation/Reference:
An IP phone contains an integrated three-port 10/100 switch. The ports, which are dedicated connections, are described as follows:
*Port 1 connects to the Catalyst series switch or other device that supports Voice-over-IP (VoIP).
*Port 2 is an internal 10/100 interface that carries the phone traffic. * Port 3 connects to a PC or other device.
To enhance the quality of the VoIP traffic, port 2 and port 3 are often placed in two different
VLANs. The VLAN carries voice traffic to and from the IP Phone is often called auxiliary VLAN (Port 2 in this case) while the VLAN carries data traffic is often the native VLAN (Port 3 in this case).
To learn how to configure auxiliary VLAN please read:
http://www.cisco.com/en/US/docs/switches/lan/catalyst4000/8.1/configuration/guide/ vlans.html#wp1048863.
To learn how to configure voice and data VLAN please read: http://www.cisco.com/en/US/products/hw/switches/ps4324/ products_configuration_example09186a0080722cdb.shtml.
