Buying into software-defined networks

Some of the world's biggest technology companies are keen to invest in SDN, a technology that allows users to substitute complex hardware functions in server switches with software. But are SDNs all they are cracked up to be?

As Superstorm Sandy bore down on the East coast last year, companies with data centres in its path needed another location fast. But moving computer servers is tricky, and usually planned over days or weeks.

Enter a new technology: software-defined networking, or SDN. Such urgent data moves could now be done within a few hours.

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