- A
Amazon CloudWatch Logs
Why wrong: CloudWatch Logs is for storing and monitoring logs, not for detecting anomalies.
- B
Amazon GuardDuty
GuardDuty can detect suspicious S3 activity such as unusual data access.
- C
AWS CloudTrail
CloudTrail logs S3 API calls for audit and analysis.
- D
AWS Config
Why wrong: AWS Config evaluates resource configurations, not activity patterns.
- E
Amazon Macie
Macie uses machine learning to discover sensitive data and detect anomalous access patterns.
Question 776 of 1,748
How to Detect S3 Data Exfiltration Using AWS Security Services
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 engineer is investigating a possible data exfiltration from an S3 bucket. Which THREE AWS services can be used to detect and alert on suspicious activity? (Choose THREE.)
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, including data exfiltration from S3 buckets. It uses machine learning and integrated threat intelligence to analyze CloudTrail management and data events, VPC flow logs, and DNS logs, generating alerts for suspicious patterns like unusual data transfers or API calls from known malicious IPs.
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 CloudWatch Logs
Why it's wrong here
CloudWatch Logs is for storing and monitoring logs, not for detecting anomalies.
- ✓
Amazon GuardDuty
Why this is correct
GuardDuty can detect suspicious S3 activity such as unusual data access.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
AWS CloudTrail
Why this is correct
CloudTrail logs S3 API calls for audit and analysis.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Config
Why it's wrong here
AWS Config evaluates resource configurations, not activity patterns.
- ✓
Amazon Macie
Why this is correct
Macie uses machine learning to discover sensitive data and detect anomalous access patterns.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS Config with a security detection service, but Config only tracks configuration changes and compliance, not the actual data access or network activity needed to detect exfiltration.
Detailed technical explanation
How to think about this question
GuardDuty specifically analyzes S3 data events (e.g., GetObject, PutObject) from CloudTrail to detect anomalies like unusual access patterns from unfamiliar IPs or geographies, or excessive data downloads that may indicate exfiltration. It also correlates findings with VPC flow logs to identify data transfers to known command-and-control servers or Tor exit nodes, providing a multi-layered detection approach. In a real-world scenario, GuardDuty can alert on a sudden spike in S3 GetObject requests from a single IAM user to multiple buckets, which might indicate an attacker harvesting data after credential compromise.
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, including data exfiltration from S3 buckets. It uses machine learning and integrated threat intelligence to analyze CloudTrail management and data events, VPC flow logs, and DNS logs, generating alerts for suspicious patterns like unusual data transfers or API calls from known malicious IPs.
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.
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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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