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Security Fundamentals & Crypto · Intermediate

Device Posture Check

Evaluating a device's security state, such as patch level, encryption, and EDR status, before granting access.

Definition

Posture checks verify compliance with policy, including OS version, disk encryption, firewall status, antivirus/EDR health, and management enrollment. Non-compliant devices can be blocked, quarantined, or sent to remediation. Posture is used by NAC, ZTNA, and Conditional Access.

Example

Cisco ISE places a laptop in a remediation VLAN because its antivirus definitions are out of date.

Exam tip

Posture assessment is how NAC and zero trust include device health in access decisions.

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