Why should you carry voice traffic on a separate VLAN?

You are a network administrator of a large investor relations company that uses a switched
network to carry both data and IP telephony services. Why should you carry voice traffic on a
separate VLAN?

A.
IP phones require inline power and must be in separate VLAN to receive inline
power.

B.
IP telephony applications require prioritization over other traffic as they are more
delay sensitive.

C.
IP phones can only receive IP addresses through DHCP if they are in separate
VLAN.

D.
The CDP frames from the IP phone can only be recognized by the switch if the
phone is in an auxiliary vlan.

Explanation:
Voice conversations don’t take up a lot of bandwidth, but the bandwidth they do is very
delicate. If anything happens with the connection or the integrity of the data transfer in either

direction the conversation won’t seam natural. To ensure the highest degree of integrity you
should put voice traffic on its own separate VLAN and give that VLAN the highest priority.