Why are some people talking about unknown? It is clearly noncompliant! It is saying that the device fails to meet the requirements, so It has already been scanned and deemed non compliant.
Unknown Profile
If no matching posture policy is defined for an endpoint, then the posture compliance status of the endpoint may be set to unknown. A posture compliance status of unknown can also apply to an endpoint where a matching posture policy is enabled but posture assessment has not yet occurred for that endpoint and, therefore no compliance report has been provided by the client agent.
Noncompliant Profile
The posture compliance status of an endpoint is set to noncompliant when a matching posture policy is defined for that endpoint but it fails to meet all the mandatory requirements during posture assessment. An endpoint that is postured noncompliant matches a posture requirement with a remediation action, and it should be granted limited network access to remediation resources in order to remediate itself.
When a client fails to be a compliant status the status is updated to noncompliant so answer is D:
Client System Stuck in Noncompliant State
If a client machine is unable to remediate a mandatory requirement, the posture status changes to “noncompliant” and the agent session is quarantined. To get the client machine past this “noncompliant” state, you need to restart the posture session so that the agent starts posture assessment on the client machine again.
OR
With an initial posture check, any endpoint that fails to satisfy all mandatory requirements is deemed non-compliant.
D
If a client machine is unable to remediate a mandatory requirement, the session posture status changes to "non-compliant" and the agent session is quarantined. The only way to get the client machine past this "non-compliant" state is by initiating a new RADIUS or posture session where the agent starts posture assessment on the client machine again.
https://www.cisco.com/en/US/docs/security/ise/1.0/user_guide/ise10_pos_pol.html
D
Cause
Unknown Profile
If no matching posture policy is defined for an endpoint, then the posture compliance status of the endpoint may be set to unknown. A posture compliance status of unknown can also apply to an endpoint where a matching posture policy is enabled but posture assessment has not yet occurred for that endpoint and, therefore no compliance report has been provided by the client agent.
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