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Following questions and answers are all new published by Cisco Official Exam Center: https://www.lead2pass.com/300-115.html
QUESTION 351
Refer to the exhibit. A network engineer deployed an older switch with the same spanning-tree priority as the existing root, which caused a network outage. In which two locations should the Spanning Tree protocol root guard feature be implemented? (Choose two.)
A. On the designated root switch downlinks to the access layer.
B. On all of non-root switch facing ports of the access layer
C. On the access layers root facing ports
D. On Layer 3 boundaries in the distribution layer
E. Globally on all network switches.
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