A basic switch that is not configured for VLANs has VLAN functionality disabled or permanently enabled with a default VLAN that contains all ports on the device as members. The default VLAN typically uses VLAN identifier 1. Every device connected to one of its ports can send packets to any of the others. Separating ports by VLAN groups separates their traffic very much like connecting each group using a distinct switch for each group.
A basic switch that is not configured for VLANs has VLAN functionality disabled or permanently enabled with a default VLAN that contains all ports on the device as members. The default VLAN typically uses VLAN identifier 1. Every device connected to one of its ports can send packets to any o.f the others Separating ports by VLAN groups separates their traffic very much like connecting each group using a distinct switch for each group.