There are two CLIs which support the Networking API: OpenStackClient (OSC) and neutron CLI (deprecated).
OpenStackClient provides the basic network commands and python-neutronclient provides extensions (aka OSC plugins) for advanced networking services.
neutron CLI is now deprecated and will be removed in the future. Use openstack CLI instead. See openstack CLI command list and its extensions for advanced networking services. The command mapping from neutron CLI to openstack CLI is available here.