The recently released Cisco router NAT module enforces NAC at the remote branch locations or ancillary buildings of a campus. Apart from that, the NAC router module also improves the overall security of the network by making sure that all incoming users and devices comply with security policies.
Additionally, the Cisco NAC router module (part # NME-NAC-K9) brings the capabilities of Cisco NAC Appliance Server to Cisco 2800 and 3800 Series Integrated Services Routers. This module helps network administrators by not having to deploy NAC appliances across the board and it helps to consolidate the administrative tasks into fewer boxes.
Amazingly, this module is actually a 1 GHz Intel Celeron PC, with 512 MB RAM, 64 MB of Compact Flash, and an 80 GB SATA hard drive. All that fits onto a single 1 pound module that slides into a router and enforces your security policies. This module requires a 2800 or 3800 series router running IOS 12.4(11)T or later.