Function of Cisco Network Admission Control (NAC)

[zshowip]

Hi Anyone can explain Cisco Network Admission Control (NAC)? its function? The below is statement of Cisco. Which means that ISE has two functions: One is ACS, and another is NAC. but what NAC does exactly? I know ACS in ISE, but which function belongs to NAC? Thank you

The Cisco Identity Services Engine (ISE) is a next-generation, context-based access control solution that provides the functions of Cisco Secure Access Control System (ACS) and Cisco Network Admission Control (NAC) in one integrated platform

[balaji.bandi · Accepted solution]

cisco has good explanation here :

https://www.cisco.com/c/en_uk/products/security/what-is-network-access-control-nac.html