So I've been looking through the Cisco website trying to get information about Cisco NAC (at the request of my boss, the IT team leader). Unfortunately, all the information about NAC on this website is geared towards supervisors and purchasing authorities; I haven't been able to find any sort of real technical data, just a bunch of sales mumbo-jumbo. I know a lot about what it can do, but nothing about how it does it.
I would like to know how this system would interact with my network. I'm newly in charge of an almost pure Cisco network consisting of a couple dozen Catalyst 2950 switches and 3 Catalyst 3750 stacks in various positions throughout the network.
Our network uses a star-topology, meaning all the switches tend to radiate from the central Layer 3 switches (the 3750s), meaning we don't, at the moment, have any sort of redundancy like in the Cisco-recommended Core-Distribution-Access topology. We want to get to that point sometime in the future.
Anyways, I'd like to know how I can integrate Cisco NAC into my existing network. How would it connect and where? How does it regulate access? Do all computers require some kind of client to be installed? How does it regulate VLANs (of which we have about 50)?
Like I said, we want to basically overhaul our network sometime in the future, but I'm not really counting on it happening soon, so I'd like to know how NAC would be implemented in our current network so that we may be able to enjoy some of those benefits right away.