Exam 400-007 topic 1 question 42 discussion

Actual exam question from Cisco's 400-007

Question #: 42
Topic #: 1

Company XYZ, a global content provider, owns data centers on different continents. Their data center design involves a standard three-layer design with a Layer
3-only core. HSRP is used as the FHRP. They require VLAN extension across access switches in all data centers, and they plan to purchase a Layer 2 interconnection between two of their data centers in Europe. In the absence of other business or technical constraints, which termination point is optimal for the
Layer 2 interconnection?

A. at the core layer, to offer the possibility to isolate STP domains
B. at the aggregation layer because it is the Layer 2 to Layer 3 demarcation point
C. at the access layer because the STP root bridge does not need to align with the HSRP active node
D. at the core layer because all external connections must terminate there for security reasons

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Suggested Answer: B 🗳️

by J_W at June 4, 2023, 5:20 a.m.

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J_W

Highly Voted 1 week ago

Selected Answer: B

The aggregation layer acts as the boundary between the access layer and the core layer. It is responsible for aggregating multiple access switches and providing connectivity to the core layer. By terminating the Layer 2 interconnection at the aggregation layer, you can effectively extend VLANs across the access switches in both data centers. This approach allows for better control and management of Layer 2 connectivity while keeping the core layer as a Layer 3-only domain. It avoids extending Layer 2 beyond the necessary boundaries and helps isolate the Spanning Tree Protocol (STP) domains, minimizing the impact of potential spanning tree issues.

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Exam 400-007 topic 1 question 42 discussion

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J_W

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