We currently have two subnets, LAN and DMZ, with an ASA 5505 w/ security plus handling the routing between LAN/DMZ. We have two switches and are replacing one of them. With the ASA in place, we should be fine to continue with only layer 2 switches, but what if we want to add a third subnet? Will we need a layer 3 switch then, or can the ASA do more than two subnets (or is it a bad idea)?
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