One of the most immediate objectives of AT&T’s move towards SDN and virtualization is to expand its network as a service (NWaaS) activities. The more flexible a network is, the more it can be ‘sliced’ into separate virtual sections dedicated to a particular application, enterprise customer or service provider. Capacity in the slices can be dialled up or down as those users need it, and charged on an on-demand basis. The US carrier has made first steps towards this kind of platform – a pay-as-you-go approach once only envisaged by non-MNOs like Google. It says its SDN-enabled Network On Demand offering, which allows enterprise customers to dial bandwidth up and down as required in real time, has seen the fastest…