Why must customers implement networks differently than they have in the past?

A.
Networks are designed to support east-west traffic, rather than north-southtraffic.

B.
Networks are difficult and time-consuming to manage because they include too many layers,
devices, and operating systems.

C.
Networks are typically built on proprietary protocols, rather than open standards protocols.

D.
Networks require new hardware with increased processing power to support Software-Defined
Networking (SDN).