I know that within a LAN, all devices in a VLAN must be on the same subnet, but when a network is split up into many LANs using multiple routers, is it OK to use the same VLANs on each network even though they will be using different subnets?
The reason I ask is because the cisco CCNA material only dealt with VLANs within a single LAN, yet the assignment I have to do deals with 6 LANs connected by routers, each LAN having 3 subnets, and each LAN will use VLANs 100, 200 and 300. Now VLAN 100 on LAN A will have a different subnet to VLAN 100 on LAN B, so will they still be able to communicate? Or is it because they communicate through the router rather than just switches that this will work fine?
The reason I ask is because the cisco CCNA material only dealt with VLANs within a single LAN, yet the assignment I have to do deals with 6 LANs connected by routers, each LAN having 3 subnets, and each LAN will use VLANs 100, 200 and 300. Now VLAN 100 on LAN A will have a different subnet to VLAN 100 on LAN B, so will they still be able to communicate? Or is it because they communicate through the router rather than just switches that this will work fine?
