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【单选题】

Which of the following is a characteristic of a data center core?（）

A、Server-to-server traffic always remains in the core layer.

B、The recommended practice is for the core infrastructure to be in Layer 3.

C、The boundary between Layer 2 and Layer 3 should be implemented in the aggregation layer.

D、The Cisco Express Forwarding hashing algorithm is the default, based on the IP address and Layer 4 port.

E、Core layer should run BGP along with an IGP becauseiBGP has a lower administrative distance than any IGP.

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