- A
Operational Excellence
Why wrong: Operational Excellence covers running and improving operations. IAM policies, encryption, and security detection are Security pillar activities.
- B
Reliability
Why wrong: Reliability focuses on failure recovery and availability. Security controls like IAM, encryption, and network access are the Security pillar.
- C
Security
The Security pillar encompasses identity and access management, detective controls, infrastructure protection, data protection, and incident response — all of which the architect is implementing.
- D
Cost Optimisation
Why wrong: Cost Optimisation focuses on reducing unnecessary spending. Security controls are in the Security pillar regardless of their cost.
Question 807 of 1,024
CLF-C02 Cloud Concepts Practice Question
This CLF-C02 practice question tests your understanding of cloud concepts. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 solutions architect implements IAM least-privilege policies, enables encryption for all data at rest and in transit, configures VPC security groups and NACLs to limit network access, and sets up automated security incident detection. Which Well-Architected Framework pillar covers these activities?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"least"Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Security
The Security pillar of the AWS Well-Architected Framework focuses on protecting data, systems, and assets through identity and access management (IAM least-privilege policies), data protection (encryption at rest and in transit), infrastructure protection (VPC security groups and NACLs), and detective controls (automated security incident detection). These activities directly map to the Security pillar's design principles and best practices.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Operational Excellence
Why it's wrong here
Operational Excellence covers running and improving operations. IAM policies, encryption, and security detection are Security pillar activities.
- ✗
Reliability
Why it's wrong here
Reliability focuses on failure recovery and availability. Security controls like IAM, encryption, and network access are the Security pillar.
- ✓
Security
Why this is correct
The Security pillar encompasses identity and access management, detective controls, infrastructure protection, data protection, and incident response — all of which the architect is implementing.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Cost Optimisation
Why it's wrong here
Cost Optimisation focuses on reducing unnecessary spending. Security controls are in the Security pillar regardless of their cost.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse the Security pillar with Operational Excellence because both involve monitoring and automation, but Security specifically addresses data protection, identity, and network controls, not operational runbooks or deployment pipelines.
Detailed technical explanation
How to think about this question
IAM least-privilege policies use AWS managed policies or customer-managed policies with specific ARNs and conditions to grant only required permissions. Encryption at rest uses AWS KMS with envelope encryption (CMK and data keys), while encryption in transit uses TLS 1.2+ protocols. VPC security groups act as stateful firewalls at the instance level, whereas NACLs are stateless and operate at the subnet level, providing an additional layer of network segmentation.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Cloud Concepts — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Concepts — This question tests Cloud Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Security — The Security pillar of the AWS Well-Architected Framework focuses on protecting data, systems, and assets through identity and access management (IAM least-privilege policies), data protection (encryption at rest and in transit), infrastructure protection (VPC security groups and NACLs), and detective controls (automated security incident detection). These activities directly map to the Security pillar's design principles and best practices.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This CLF-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CLF-C02 exam.
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