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Which action resolves the Layer 2 loop while maintaining backup connectivity?

Refer to the Exhibit.

In the exhibit, the enterprise is running RSTP on all switches in its network and is currently
experiencing Layer 2 loops. The primary link is between switch 1 and switch 2. For redundancy, a
secondary Layer 2 link is purchased from the provider. The provider uses Q-in-Q tunneling to
transport the enterprise’s Layer 2 frames.
Which action resolves the Layer 2 loop while maintaining backup connectivity?

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A.
The provider enables Layer 2 protocol tunneling.

B.
You migrate the enterprise Layer 2 domain to MSTP.

C.
Enable the bpdu-time-out-action command on switch 3 and switch 4.

D.
Enable the bpdu-block command on switch 3 and switch 4.

Explanation:


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