ISC2 Governance, Risk and Compliance (CGRC) Practice Question
Your organization's legacy industrial control system cannot support multi-factor authentication mandated by policy. Until the vendor provides a compliant update, which compensating control offers the most equivalent protection while remaining practical for day-to-day operations?
Increase the device's minimum password length to 12 characters and enforce 90-day password rotation.
Conduct semi-annual credential audits and vulnerability scans and record any weaknesses in the POA&M.
Place the control system in a dedicated, firewall-protected VLAN and require users to authenticate with MFA on a secured jump server before any access.
Add a login banner that warns users of monitoring and potential disciplinary action for unauthorized activities.
When a primary control such as multi-factor authentication (MFA) cannot be installed on a legacy device, a compensating control must deliver comparable risk reduction. Placing the system on a tightly segmented network that can be reached only through a hardened jump server where MFA is enforced keeps direct access limited to authenticated, authorized users and blocks lateral movement-approximating the assurance MFA would have provided on the device itself. Increasing password length, scheduling periodic audits, or displaying a warning banner each improve security or accountability but do not provide an equivalent preventive barrier to unauthorized access.
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What is a VLAN and how does it help in securing network systems?
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ISC2 Governance, Risk and Compliance (CGRC)
Implementation of Security and Privacy Controls
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