802.1ad/Q-in-Q adds what to provide tenacity?

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Multiple Choice

802.1ad/Q-in-Q adds what to provide tenacity?

Explanation:
Q-in-Q (802.1ad) extends VLAN tagging by adding an outer tag to frames. This outer tag, called the service tag (S-tag), sits above the customer's VLAN tag. With this S-tag, a service provider can carry many customer VLANs across its network, keeping each customer’s traffic isolated while applying consistent service policies end-to-end. That persistent service context across the network enhances tenacity—the ability to maintain and recover service despite topology changes or failures—because frames retain their service identity as they traverse the provider infrastructure. The other options don’t describe this tagging method: inter-frame gap is a timing concept, 1526 bytes is a maximum frame size, and Underlay Connectivity Services refers to a broader layer, not the tagging mechanism.

Q-in-Q (802.1ad) extends VLAN tagging by adding an outer tag to frames. This outer tag, called the service tag (S-tag), sits above the customer's VLAN tag. With this S-tag, a service provider can carry many customer VLANs across its network, keeping each customer’s traffic isolated while applying consistent service policies end-to-end. That persistent service context across the network enhances tenacity—the ability to maintain and recover service despite topology changes or failures—because frames retain their service identity as they traverse the provider infrastructure. The other options don’t describe this tagging method: inter-frame gap is a timing concept, 1526 bytes is a maximum frame size, and Underlay Connectivity Services refers to a broader layer, not the tagging mechanism.

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