Q-in-Q tagging is used to carry what across a provider network?

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Multiple Choice

Q-in-Q tagging is used to carry what across a provider network?

Explanation:
Q-in-Q tagging, also called double tagging, is a Layer 2 technique that lets a service provider transport a customer's VLAN information across its network. The customer’s frame already has a VLAN tag identifying its VLAN, and the provider adds an outer VLAN tag around that frame. The inner tag preserves the customer’s VLAN ID, while the outer tag lets the provider segregate traffic from many customers on the same physical network. This is why it’s used to carry Customer VLAN tags across the provider network. It isn’t about IP addresses, MAC addresses, or protocol numbers, which live in other parts of the headers.

Q-in-Q tagging, also called double tagging, is a Layer 2 technique that lets a service provider transport a customer's VLAN information across its network. The customer’s frame already has a VLAN tag identifying its VLAN, and the provider adds an outer VLAN tag around that frame. The inner tag preserves the customer’s VLAN ID, while the outer tag lets the provider segregate traffic from many customers on the same physical network. This is why it’s used to carry Customer VLAN tags across the provider network. It isn’t about IP addresses, MAC addresses, or protocol numbers, which live in other parts of the headers.

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