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how does a carrier differentiate one customers traffic from that of another?

Using Q-in-Q Virtual Local Area Network (VLAN) stacking, how does a carrier differentiate
one customers traffic from that of another?

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A.
The PE switch assigns a customer-specific priority label to the customers traffic.

B.
The provider edge (PE) switch adds an additional field called a PE tag to the customers
Layer 2 data.

C.
The PE switch replaces the customers VLAN tag with a carrier-assigned tag.

D.
The PE switch adds a second VLAN tag to identify the customers traffic on the carriers

network.

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