单选题
Which statement about data center access layer design modes is correct?（）
发布日期：2020-04-11
The access layer is the first oversubscription point in a data center design.
When using a Layer 2 loop-free design, VLANs are extended into the aggregation layer.
When using a Layer 2 looped design, VLANs are not extended into the aggregation layer.
When using a Layer 3 design,stateful services requiring Layer 2 connectivity are provisioned from the aggregation layer.
The data center access layer provides the physical-level connections to the server resources and only operates at Layer 3.
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