Basic Packetfence lab scenerio...Radius Enforcement + MAB + Role-based VLAN Assignment

I'm just getting my feet wet with Packetfence.

As a "first level", I would like to use Packetfence to assign VLANs based the role assigned to a particular node.

1. I have created several test roles.
2. On the switch definition, I have set a RADIUS secret and defined Role-based VLAN IDs.
3. The switch is configured for MAB on the access port with a "fallback" network and the other VLANs to be assigned are tagged on the port.

I have manually registered my nodes. So, do I need an authentication source?