Which statement about data center access layer design modes is correct?（）A、The access layer is the first oversubscription point in a data center design.B、When using a Layer 2 loop-free design, VLANs are extended into the aggregation layer.C、When using a Layer 2 looped design, VLANs are not extended into the aggregation layer.D、When using a Layer 3 design,stateful services requiring Layer 2 connectivity are provisioned from the aggregation layer.E、The data center access layer provides the physical-level connections to the server resources and only operates at Layer 3.
Which statement about data center access layer design modes is correct?（）
- A、The access layer is the first oversubscription point in a data center design.
- B、When using a Layer 2 loop-free design, VLANs are extended into the aggregation layer.
- C、When using a Layer 2 looped design, VLANs are not extended into the aggregation layer.
- D、When using a Layer 3 design,stateful services requiring Layer 2 connectivity are provisioned from the aggregation layer.
- E、The data center access layer provides the physical-level connections to the server resources and only operates at Layer 3.
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多选题Which three are true?（）AA MERGE statement is used to merge the data of one table with data from another.BA MERGE statement replaces the data of one table with that of another.CA MERGE statement can be used to insert new rows into a table.DA MERGE statement can be used to update existing rows in a table.
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