Here is why the multi-layered approach to security in so important

It is now obvious that, in order to gain a holistic overview of the network, technology managers need to design the infrastructure from the bottom up, starting with the physical layer, comprising devices and other hardware, and working up to the application layer.

This multi-layered approach to security gives IT managers more visibility into the network so that they can see what data is coming into and leaving the network and can implement controls as required.