ISC2 Systems Security Certified Practitioner (SSCP) Practice Question
A financial services company uses an 802.1X-based NAC solution to verify that laptops have up-to-date antivirus signatures before they receive a production VLAN address. Auditors now insist that the NAC must also detect when a laptop becomes non-compliant during the workday and automatically move it to a quarantine network without user intervention. Which NAC feature meets this new requirement?
One-time certificate authentication performed only during pre-admission
Periodic post-admission posture assessment with dynamic VLAN re-assignment
Link-layer encryption using 802.1AE (MACsec) on all access links
Port security that restricts the number of MAC addresses allowed on each switch port
The requirement describes a control that is applied after the endpoint has already been admitted to the network; it must continue to monitor the device's health and, if the posture changes, dynamically enforce a different policy (for example by moving the host to a remediation or quarantine VLAN). This is a classic post-admission control implemented through periodic or continuous posture assessment combined with dynamic VLAN assignment. One-time pre-admission checks, port-based MAC limits, or link-layer encryption all occur either before admission or focus on different security objectives, and they do not provide ongoing health verification or automated quarantine.
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ISC2 Systems Security Certified Practitioner (SSCP)
Network and Communication Security
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