Well, you could always ask here, some of us have knowledge in this area. For me, I got it once I admitted that it's a separation like the one you get physically different networks. It's all on the same cable, but there is one network interface per VLAN, so if you want traffic to go from one VLAN to the other, you have to use a router (layer 4) or layer 3 switch capable of VLAN to VLAN communication.
