- A
Amazon Macie
Why wrong: Macie discovers sensitive data, not analyzes access logs.
- B
Amazon GuardDuty
GuardDuty analyzes S3 data events for suspicious activity.
- C
AWS Trusted Advisor
Why wrong: Trusted Advisor provides recommendations, not threat detection.
- D
Amazon Detective
Why wrong: Detective investigates incidents but does not automatically analyze S3 access logs.
Question 703 of 1,748
Amazon GuardDuty: Detect Unauthorized S3 Access Automatically
This SCS-C02 practice question tests your understanding of security logging and monitoring. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 team needs to detect unauthorized attempts to access an S3 bucket that contains sensitive data. Which AWS service can automatically analyze S3 access logs and generate findings for suspicious activity?
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
✓
Amazon GuardDuty
Amazon GuardDuty is a threat detection service that continuously monitors for malicious activity and unauthorized behavior across AWS accounts and workloads. It can analyze VPC Flow Logs, AWS CloudTrail event logs, and DNS logs, and when S3 access logging is enabled, GuardDuty can ingest those logs to detect suspicious S3 access patterns, such as anomalous data exfiltration or access from unusual geographies. GuardDuty then generates security findings that can be automated for remediation.
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.
- ✗
Amazon Macie
Why it's wrong here
Macie discovers sensitive data, not analyzes access logs.
- ✓
Amazon GuardDuty
Why this is correct
GuardDuty analyzes S3 data events for suspicious activity.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Trusted Advisor
Why it's wrong here
Trusted Advisor provides recommendations, not threat detection.
- ✗
Amazon Detective
Why it's wrong here
Detective investigates incidents but does not automatically analyze S3 access logs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Amazon Macie's data classification and sensitive data discovery capabilities with GuardDuty's threat detection, mistakenly thinking Macie can analyze access logs for unauthorized activity, when in fact Macie focuses on data content and access control policies, not real-time log-based threat detection.
Detailed technical explanation
How to think about this question
GuardDuty uses integrated threat intelligence and machine learning models to detect anomalies in S3 access patterns, such as a sudden spike in read requests from a new IP address or access to an S3 bucket from a known malicious Tor exit node. It ingests S3 server access logs via S3 data events enabled in CloudTrail, and its findings include details like the affected resource ARN, the IAM principal, and the specific API call (e.g., GetObject, PutObject). In a real-world scenario, GuardDuty can detect a compromised IAM credential being used to enumerate bucket contents from an unusual location, triggering a finding that can be sent to Amazon EventBridge for automated response.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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.
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FAQ
Questions learners often ask
What does this SCS-C02 question test?
Security Logging and Monitoring — This question tests Security Logging and Monitoring — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon GuardDuty — Amazon GuardDuty is a threat detection service that continuously monitors for malicious activity and unauthorized behavior across AWS accounts and workloads. It can analyze VPC Flow Logs, AWS CloudTrail event logs, and DNS logs, and when S3 access logging is enabled, GuardDuty can ingest those logs to detect suspicious S3 access patterns, such as anomalous data exfiltration or access from unusual geographies. GuardDuty then generates security findings that can be automated for remediation.
What should I do if I get this SCS-C02 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on SCS-C02
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is experiencing unauthorized access attempts to an S3 bucket. Which AWS service can be used to detect and alert on such events in real time?
easy- A.Amazon Macie
- B.AWS Config
- C.AWS CloudTrail
- ✓ D.Amazon GuardDuty
Why D: Amazon GuardDuty is a threat detection service that continuously monitors for malicious activity and unauthorized behavior across AWS accounts and workloads. It uses machine learning, anomaly detection, and integrated threat intelligence to analyze AWS CloudTrail management and data events, VPC Flow Logs, and DNS logs. When it detects unauthorized access attempts to an S3 bucket, such as suspicious API calls or anomalous data access patterns, it generates real-time security findings that can be sent to Amazon CloudWatch Events for alerting and automated response.
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Last reviewed: Jul 4, 2026
This SCS-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 SCS-C02 exam.
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