This network diagram is an example of an academic institution network. The following diagram shows network connectivity between the admin office, library, and a remote campus. There are two physical firewalls providing internet connectivity redundancies. The main virtual network consists of the database server, file server, accounting server, and library catalog server. The database server and the file server are connected with the bridge vmbr0. The accounting server is connected with the bridge vmbr10 and VLAN ID 10. The library server is connected with the bridge vmbr20 and VLAN ID 20. The main switch is set up with VLAN 10 and 20. The library switch is set up with VLAN 20. In this setup, accounting server data goes straight to the admin office and the library catalog server data goes to the library building without causing additional stress to the network. Remote campus students and staff can access the main campus network through VPN, thus eliminating the need to set up a separate virtual environment.

Of course, the following diagram is a very simplified form of the actual network topology of an academic institution. But the basics of using VLANs and bridges are the same for any network size: