Some further clarification. NAC Appliance licenses were not term. NAC Agent licenses were not separately licensed and do not have notion of agent Apex like AC for Posture. NAC Agent can be used with ISE up to ISE 2.2: https://www.cisco.com/c/en/us/td/docs/security/ise/2-2/compatibility/ise_sdt.html#pgfId-123696 Also note posture would require an Apex license on ISE.
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