What is the difference between a queuing system and a queuing network?

Question

Probability theory

If we adhere to the definition:
A queuing system (QS) is a mathematical (abstract) object containing one or more devices (channels) that serve applications entering the system and a drive that contains applications that form queue O and are waiting for service.
A queuing network (QN) is a set of interconnected QS, in the environment of which applications circulate.
That network is a more general definition of a system.

Answer 1

That network is a more general definition of a system.

No. It is also clearly stated there: CMO is several CMOs