Typically, an OpenStack environment includes multiple servers. It is crucial to enable communication between the servers and with the outside world. Historically, the `nova-network` service manages networking within the OpenStack environment. However, the `neutron` (formerly `quantum`) networking service becomes more widely used. For certain deployments, `nova-network` provides advantages over `neutron`. For example, Fuel supports `nova-network`in both Flat-DHCP and VLAN modes.