Adding a network to the topology is a necessary step to implement CAC, not QoS. CAC uses the IP configuration of the client to decide which subnet and site the client belongs to. The information entered into Lync must match that of the client's IP configuration.
Servers can be clients too.
Supernetting two /24 subnets into one /23 subnet is not supported and will not work.
Subnets are added to sites, and sites are organized into regions. When entering this information into Lync, we have to create the regions first, then the sites, and finally the subnets.
Gather all the possible information on the layout of the infrastructure. Look at the previous tables for examples on how to document the deployment ...