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Q1 Single choice

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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