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?
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: