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The main differences are:1. Base version has a restriction on the # of interfaces. You can setup inside, outside and one DMZ. Additionally you have to restrict communication between the inside and the DMZ.2. The Plus version does not have this interf...
whenever you need to trunk to a switch and be able to have more than the limit of physical interfaces. For instance an ASA 5510 allows you to have 100 VLAN interfaces.Whenever you need to setup more than on DMZ.