Understanding the Pop-Swap Operation in Q-in-Q Tunneling
Question
In Q-in-Q tunneling, what is the purpose of the pop-swap operation?
Answers
Explanations
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A. B. C. D.A
In Q-in-Q tunneling, a second VLAN tag is inserted into an Ethernet frame, allowing for multiple VLANs to be transported over a single link. The outer tag corresponds to the service provider network and the inner tag corresponds to the customer VLAN.
The purpose of the pop-swap operation is to remove the outer VLAN tag and replace it with a new VLAN tag. This operation is performed when the Ethernet frame exits the service provider network and enters the customer network.
Option A, "pop the outer tag and swap the inner tag," is incorrect because the inner tag is not modified in the pop-swap operation.
Option B, "pop and swap the inner tag," is incorrect because the inner tag is not modified in the pop-swap operation.
Option C, "pop and swap both outer and inner tags," is incorrect because only the outer tag is modified in the pop-swap operation.
Option D, "pop the inner tag and swap the outer tag," is incorrect because the inner tag is not modified in the pop-swap operation.
Therefore, the correct answer is A, "pop the outer tag and swap the inner tag."
