A vNetwork provides several different services to the host and virtual machines.

You can enable three types of network services in ESX:

Connecting virtual machines to the physical network and to each other.

Connecting VMkernel services (such as NFS, iSCSI, or vMotion) to the physical network.

Running management services for ESX via the service console. A service console port, which is set up by default during installation, is required for ESX to connect to any network or remote services, including the vSphere Client. Additional service console ports might be necessary for other services, such as iSCSI storage.