ISC2 Governance, Risk and Compliance (CGRC) Practice Question
During a federal agency's security categorization exercise, the assessor finds that for its most critical information type, confidentiality is rated Moderate, integrity Low, and availability High. Under FIPS 199 guidance, what overall impact level should be assigned to the system?
Moderate, since confidentiality is often the primary consideration for federal systems.
High, because the highest single impact rating dictates the system's overall categorization.
Moderate, calculated by averaging the three impact values and rounding up.
Assign separate impact levels for each control family instead of one overall rating.
FIPS 199 requires organizations to assign an overall impact level to an information system by selecting the highest impact value identified for any of the three security objectives-confidentiality, integrity, or availability. Even though only availability is rated High in this scenario, that High rating outweighs the Moderate and Low values. Therefore, the entire system must be categorized as High. Selecting Moderate because confidentiality is Moderate ignores the standard's 'highestâwatermark' rule; averaging the ratings or assigning separate levels per control family are not permitted approaches under FIPS 199.
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What does FIPS 199 stand for and why is it important?
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What is the 'highest-watermark' rule in FIPS 199?
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Why can't the impact levels for confidentiality, integrity, and availability be averaged under FIPS 199?
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ISC2 Governance, Risk and Compliance (CGRC)
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