The answer is ISO 27005. This methodology is the best choice because it is an international standard specifically designed for information security risk management that inherently supports both qualitative and quantitative analysis, allowing a financial institution to balance subjective expert judgment with measurable data while aligning with broad regulatory compliance requirements. On the Certified Information Security Manager CISM exam, this question tests your ability to distinguish between frameworks based on their scope and regulatory fit; a common trap is choosing OCTAVE for its qualitative depth or FAIR for its quantitative rigor, but neither provides the comprehensive, compliance-ready framework that ISO 27005 offers. Remember the memory tip: ISO 27005 is the “balanced baseline” for global compliance, whereas OCTAVE is too qualitative and FAIR is too narrow.
CISM Information Security Risk Management Practice Question
This CISM practice question tests your understanding of information security risk management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A financial institution is implementing a risk management program and needs to select a methodology that balances quantitative and qualitative factors, complies with regulatory requirements, and provides a consistent framework for risk assessment across business units. Which methodology would best meet these requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Why wrong: FAIR focuses on quantitative analysis of financial impact but is not a complete risk management standard and may not meet all regulatory requirements.
B
OCTAVE
Why wrong: OCTAVE is a qualitative methodology that does not inherently balance quantitative factors and is not a regulatory standard.
C
ISO 27005
ISO 27005 provides a comprehensive risk management framework that supports both qualitative and quantitative approaches and is widely accepted for regulatory compliance.
D
NIST SP 800-30
Why wrong: NIST SP 800-30 is primarily qualitative and tailored for US federal agencies, not ideal for balancing quantitative factors across business units.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ISO 27005
ISO 27005 is an international standard for information security risk management that supports both qualitative and quantitative approaches, aligns with various regulations, and provides a consistent framework. OCTAVE is primarily qualitative and not a regulatory standard. FAIR is quantitative but not a comprehensive standard. NIST SP 800-30 is qualitative and specific to US federal agencies.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
FAIR
Why it's wrong here
FAIR focuses on quantitative analysis of financial impact but is not a complete risk management standard and may not meet all regulatory requirements.
✗
OCTAVE
Why it's wrong here
OCTAVE is a qualitative methodology that does not inherently balance quantitative factors and is not a regulatory standard.
✓
ISO 27005
Why this is correct
ISO 27005 provides a comprehensive risk management framework that supports both qualitative and quantitative approaches and is widely accepted for regulatory compliance.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
NIST SP 800-30
Why it's wrong here
NIST SP 800-30 is primarily qualitative and tailored for US federal agencies, not ideal for balancing quantitative factors across business units.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISM NAT questions on configuration and troubleshooting.
Information Security Risk Management — This question tests Information Security Risk Management — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: ISO 27005 — ISO 27005 is an international standard for information security risk management that supports both qualitative and quantitative approaches, aligns with various regulations, and provides a consistent framework. OCTAVE is primarily qualitative and not a regulatory standard. FAIR is quantitative but not a comprehensive standard. NIST SP 800-30 is qualitative and specific to US federal agencies.
What should I do if I get this CISM question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISM NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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