The network is a necessary property of SoS, it's a set of interaction components.
"Net-Centricity is defined as the ability to provide a
framework for full human and technical interoperability that (1) allows all DoD
users and mission partners to share the information they need, when they need
it, in a form they can understand and act on with confidence, and (2) protects
information from those who should not have it."
“Many SoS architectures are described as net-centric architectures that allow the component systems to exchange information and perform tasks within the framework that they are not capable of performing on their own outside of the framework. This is often referred to as an ’emergent behavior’ ”.