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VLAN Network Confusion

Our network recently ran out of IP's and I implemented VLAN's for our separate buildings with no isolation to break up broadcast domains.

What I was looking to accomplish was to separate our Front of the House, Back of the House, Production and Second Building by VLAN's using a SG300 layer 3 switch.

Now I have accomplished this, tested it and went live with our second building but not for FOH, BOH or production.

Eventually I would like separate each VLAN and to also have a guest network that does not touch our network with internet access but for now I content with all VLAN's seeing each other.

I was told that if I am not going to isolate the network and only use it for separating my subnets that I was wasting my time.

Can I use my created VLANs for inter-vlan routing only?

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