I have central site with 50 users, without branches. Can I deploy just NAC-NM instead of CAS and if I use NAC-NM in 2811 ISR is there any bandwidth limitation when it is compared to CAS solution? In general, what is throughput for CAS (3310) and what for NAC-NM ???
Yes, the NM will work in inline mode, but as with all CAS's it can support only one mode (inline or OOB) at a time.
We're desigining our inline CAS-NM solution now in our lab, and I had similar concerns regarding throughput. I opened a TAC case and was assured that the NM CAS can do full gig throughput. Our testing showed that our router platform (an ISR 2821) can only do about 20mbps, though, even with all features turned off.