Before installing CTA to clients, check the CTA version (Cisco Trust Agent or Cisco Trust Agent Supplicant) to install. The only difference between these two versions is that the Supplicant package provides layer 2 authentication for the computer and end user.

If the Cisco NAC Access Control Server (ACS) is version 4.0 or later, upgrade the Cisco Trust Agent on the clients to version 2.0 or later.