Not too long ago, carriers had fairly straightforward options for their security: they bought one vendor's box with the same vendor's firewall, email filtering, and web application firewalls. Then came the dynamic duo of software defined network (SDN) and network function virtualization (NFV). NFV allows all network components to run in software on top of common "white box" hardware. By de-coupling hardware and software components, carriers have the power to virtualize services and provision on demand. ...

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