- A
AWS CloudTrail, because it records every API call made in the account.
Why wrong: CloudTrail is excellent for auditing API activity, but it does not evaluate resource compliance states by itself.
- B
AWS Config, because it evaluates resource configuration against compliance rules.
AWS Config is the right service for continuous resource compliance monitoring. It tracks configuration changes over time and can evaluate rules that check for conditions such as encrypted EBS volumes or overly permissive security groups. This makes it ideal for governance and drift detection, especially when the team needs to know the current state of resources rather than only the history of API calls.
- C
Amazon GuardDuty, because it automatically encrypts noncompliant resources.
Why wrong: GuardDuty detects threats and anomalies, but it does not evaluate or remediate configuration compliance.
- D
Amazon Macie, because it manages encryption settings for all AWS resources.
Why wrong: Macie specializes in discovering and classifying sensitive data in S3, not in evaluating general resource configuration compliance.
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. 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 security operations team wants continuous compliance checks for AWS resources. They need to know when an EBS volume becomes unencrypted or when a security group starts allowing SSH from 0.0.0.0/0. Which AWS service should they use?
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
AWS Config, because it evaluates resource configuration against compliance rules.
AWS Config is the correct service because it continuously monitors and evaluates the configuration of AWS resources against desired compliance rules. It can detect when an EBS volume is unencrypted or when a security group rule allows SSH (port 22) from 0.0.0.0/0, and trigger notifications or remediation actions via AWS Config rules.
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.
- ✗
AWS CloudTrail, because it records every API call made in the account.
Why it's wrong here
CloudTrail is excellent for auditing API activity, but it does not evaluate resource compliance states by itself.
When this WOULD be correct
CloudTrail would be correct if the question asked for auditing all API calls made in the account, such as tracking who created or modified resources, or for detecting unauthorized API activity.
- ✓
AWS Config, because it evaluates resource configuration against compliance rules.
Why this is correct
AWS Config is the right service for continuous resource compliance monitoring. It tracks configuration changes over time and can evaluate rules that check for conditions such as encrypted EBS volumes or overly permissive security groups. This makes it ideal for governance and drift detection, especially when the team needs to know the current state of resources rather than only the history of API calls.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon GuardDuty, because it automatically encrypts noncompliant resources.
Why it's wrong here
GuardDuty detects threats and anomalies, but it does not evaluate or remediate configuration compliance.
When this WOULD be correct
If the question asked for a service that automatically detects and alerts on suspicious API calls or network traffic patterns (e.g., compromised EC2 instances or unusual data exfiltration), GuardDuty would be the correct answer.
- ✗
Amazon Macie, because it manages encryption settings for all AWS resources.
Why it's wrong here
Macie specializes in discovering and classifying sensitive data in S3, not in evaluating general resource configuration compliance.
When this WOULD be correct
A scenario where Macie would be correct: 'A company needs to automatically discover and protect sensitive data such as PII or financial records stored in S3 buckets, and receive alerts when such data is exposed.'
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓AWS Config, because it evaluates resource configuration against compliance rules.Correct answer▾
Why this is correct
AWS Config is the right service for continuous resource compliance monitoring. It tracks configuration changes over time and can evaluate rules that check for conditions such as encrypted EBS volumes or overly permissive security groups. This makes it ideal for governance and drift detection, especially when the team needs to know the current state of resources rather than only the history of API calls.
✗AWS CloudTrail, because it records every API call made in the account.Wrong answer — click to see why▾
Why this is wrong here
CloudTrail records API calls but does not perform continuous compliance checks or evaluate resource configurations against rules; it lacks the ability to detect unencrypted EBS volumes or security group misconfigurations in real time.
★ When this WOULD be the correct answer
CloudTrail would be correct if the question asked for auditing all API calls made in the account, such as tracking who created or modified resources, or for detecting unauthorized API activity.
Why candidates choose this
Candidates may confuse logging API calls with monitoring resource configurations, assuming that recording changes is sufficient for compliance checks.
✗Amazon GuardDuty, because it automatically encrypts noncompliant resources.Wrong answer — click to see why▾
Why this is wrong here
Amazon GuardDuty is a threat detection service that monitors for malicious activity, not a compliance service that checks resource configurations like EBS encryption or security group rules.
★ When this WOULD be the correct answer
If the question asked for a service that automatically detects and alerts on suspicious API calls or network traffic patterns (e.g., compromised EC2 instances or unusual data exfiltration), GuardDuty would be the correct answer.
Why candidates choose this
Candidates may confuse GuardDuty's security monitoring with compliance checking, or mistakenly think it can enforce encryption policies because of its 'security' label.
✗Amazon Macie, because it manages encryption settings for all AWS resources.Wrong answer — click to see why▾
Why this is wrong here
Amazon Macie is a data security service that uses machine learning to discover, classify, and protect sensitive data, not to manage encryption settings or perform compliance checks on resource configurations like EBS encryption or security group rules.
★ When this WOULD be the correct answer
A scenario where Macie would be correct: 'A company needs to automatically discover and protect sensitive data such as PII or financial records stored in S3 buckets, and receive alerts when such data is exposed.'
Why candidates choose this
Candidates may confuse Macie's focus on data protection with compliance monitoring, or mistakenly think it handles encryption settings due to its 'security' branding.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse AWS CloudTrail's API logging with AWS Config's configuration evaluation, assuming that recording API calls is sufficient for compliance checks, but CloudTrail does not assess the current state of resources against rules.
Detailed technical explanation
How to think about this question
AWS Config uses a configuration recorder to capture resource configuration changes and evaluates them against managed or custom rules written in AWS Lambda. For example, the 'ec2-volume-inuse-check' rule can flag unencrypted volumes, and the 'restricted-ssh' rule checks for security group rules allowing SSH from 0.0.0.0/0. Under the hood, AWS Config maintains a configuration history and timeline, enabling compliance reporting and automated remediation via AWS Systems Manager Automation or Lambda functions.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS Config, because it evaluates resource configuration against compliance rules. — AWS Config is the correct service because it continuously monitors and evaluates the configuration of AWS resources against desired compliance rules. It can detect when an EBS volume is unencrypted or when a security group rule allows SSH (port 22) from 0.0.0.0/0, and trigger notifications or remediation actions via AWS Config rules.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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
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