Assigning of voice and data vlan

I saw the above line on a cisco practice test:

Verify that the data and voice vlans are not assigned to a trunk's native vlan.

I don't study voice so I don't understand why this cannot be done.

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Comments

Mow

It can be done, but the bigger an enterprise gets, the more isolated you want your VLANs for performance sake. If your VLANs span multiple switches, that increase the size of the broadcast domain, which creates more traffic on the switches. In the case of voice and video, this can cause more latency than is recommended.

davenull

You could assign voice vlan to a native vlan but your QoS will be thrown out of the window. The 3 CoS bits determined by 802.1p priority marking reside within the 802.1q vlan header.

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