IIA-CIA-Part3 Exam Dumps : Business Knowledge for Internal Auditing

Understanding the Three Lines of Defense Model:

First Line of Defense (Operational Management): Performs daily IT security tasks, such as blocking unauthorized traffic and encrypting data.

Second Line of Defense (Risk Management & Compliance): Monitors and reviews security controls, including disaster recovery testing and risk management activities.

Third Line of Defense (Internal Audit): Provides an independent assessment of IT security controls.

Why Option C (Review Disaster Recovery Test Results) Is Correct?

The second line of defense is responsible for monitoring and evaluating IT risk management processes, including disaster recovery and business continuity planning.

Reviewing disaster recovery test results ensures that the organization is prepared for IT disruptions and meets compliance requirements.

IIA Standard 2110 – Governance requires auditors to evaluate whether IT risk management activities (such as disaster recovery) are being effectively monitored.

Why Other Options Are Incorrect?

Option A (Block unauthorized traffic):

This is a first-line defense task, typically handled by IT security teams (e.g., firewall and intrusion detection system monitoring).

Option B (Encrypt data):

Encryption is part of daily IT security operations and is handled by the first line of defense.

Option D (Provide an independent assessment of IT security):

Independent assessments are the responsibility of internal audit (third line of defense), not the second line.

The second line of defense focuses on monitoring IT risk, making disaster recovery test review a key responsibility.

IIA Standard 2110 and the Three Lines of Defense Model confirm this role.

Final Justification:IIA References:

IPPF Standard 2110 – Governance (IT Risk Management)

IIA Three Lines of Defense Model

COBIT Framework – IT Governance & Risk Management

Preventive security controls proactively stop unauthorized access before it occurs. The most effective method is strict access management, where new or additional access rights require formal validation before being granted.

Prevents Unauthorized Entry – Ensures that only approved personnel have access to the power plant.

Implements Segregation of Duties (SoD) – Supervisors validate access requests, reducing insider threats.

Aligns with Least Privilege Principle – Employees get only the minimum access necessary for their role.

Prevents Security Risks Before They Happen – Unlike detective or corrective controls, this method stops unauthorized access before it occurs.

A. Offboarding procedure (monthly review) – This is a detective control, identifying issues after access is granted, not preventing them.

B. Smart lock anomaly scanning – Also detective, as it identifies suspicious behavior after access has been used.

D. Automatic notifications for after-hours entry – A corrective control, responding to potential violations instead of preventing them.

IIA’s GTAG on Identity and Access Management – Recommends pre-approval processes for sensitive locations.

ISO 27001 Annex A.9 (Access Control) – Requires role-based access management for critical infrastructures.

NIST SP 800-53 (Security and Privacy Controls for Federal Information Systems) – Defines supervisor approval as a key preventive measure.

Why Approval-Based Access Control is the Best Preventive Measure?Why Not the Other Options?IIA References: