← SCS-C02·Amazon Web Services

Question 307 of 1,748

Threat Detection and Incident Response →mediumMultiple ChoiceObjective-mapped

SCS-C02 Threat Detection and Incident Response Practice Question

This SCS-C02 practice question tests your understanding of threat detection and incident response. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 company has a serverless application using AWS Lambda, API Gateway, and DynamoDB. The security team wants to detect and respond to potential SQL injection attempts in API requests. They have enabled AWS WAF on the API Gateway and created a rule to block SQL injection. However, they also want to capture the blocked requests for analysis and store them in an S3 bucket. The team has configured WAF to send logs to Amazon Kinesis Data Firehose, which delivers to an S3 bucket. After testing, the team notices that the logs are not being delivered. The Firehose delivery stream is in the same AWS account, and the S3 bucket policy allows the Firehose service to write. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The WAF web ACL is not configured to log blocked requests.
Why wrong: WAF logging can capture all requests or only blocked ones; if configured, it should work.
B
The Kinesis Data Firehose delivery stream does not have an IAM role with permissions to write to the S3 bucket.
The delivery stream must have an IAM role with s3:PutObject permissions on the bucket.
C
The S3 bucket policy does not grant write permissions to the Firehose delivery stream's IAM role.
Why wrong: The bucket policy allows Firehose service principal, but the delivery stream must assume a role with permissions.
D
Kinesis Data Firehose delivers logs in batches every 5 minutes, so the team should wait longer.
Why wrong: Firehose delivery can be near real time, but even with batching, logs should appear within minutes.

Full breakdown with real-world context →

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

✓

The Kinesis Data Firehose delivery stream does not have an IAM role with permissions to write to the S3 bucket.

Option B is correct because Kinesis Data Firehose requires an IAM role with permissions to write to the S3 bucket. Even if the bucket policy allows the Firehose service, the delivery stream's IAM role must be granted write access to the bucket. Option A is incorrect because WAF can be configured to log blocked requests; the issue is that logs are not being delivered at all. Option C is incorrect because the bucket policy already allows Firehose, but the IAM role for the delivery stream is separate and must also have permissions. Option D is incorrect because Firehose delivers logs in near real time (typically within 60 seconds), so the delay is not the cause.

Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
The WAF web ACL is not configured to log blocked requests.
Why it's wrong here
WAF logging can capture all requests or only blocked ones; if configured, it should work.
✓
The Kinesis Data Firehose delivery stream does not have an IAM role with permissions to write to the S3 bucket.
Why this is correct
The delivery stream must have an IAM role with s3:PutObject permissions on the bucket.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The S3 bucket policy does not grant write permissions to the Firehose delivery stream's IAM role.
Why it's wrong here
The bucket policy allows Firehose service principal, but the delivery stream must assume a role with permissions.
✗
Kinesis Data Firehose delivers logs in batches every 5 minutes, so the team should wait longer.
Why it's wrong here
Firehose delivery can be near real time, but even with batching, logs should appear within minutes.

Common exam traps

Common exam trap: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Detailed technical explanation

How to think about this question

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

KKey Concepts to Remember

Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.

TExam Day Tips

Check inbound versus outbound direction.
Read the ACL from top to bottom.
Look for a broader permit or deny above the intended line.

Key takeaway

ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

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.

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SCS-C02 ACL questions on filtering logic and placement.

Related SCS-C02 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Threat Detection and Incident Response practice questions

Practise SCS-C02 questions linked to Threat Detection and Incident Response.

Security Logging and Monitoring practice questions

Practise SCS-C02 questions linked to Security Logging and Monitoring.

Identity and Access Management practice questions

Practise SCS-C02 questions linked to Identity and Access Management.

Management and Security Governance practice questions

Practise SCS-C02 questions linked to Management and Security Governance.

Infrastructure Security practice questions

Practise SCS-C02 questions linked to Infrastructure Security.

Data Protection practice questions

Practise SCS-C02 questions linked to Data Protection.

SCS-C02 fundamentals practice questions

Practise SCS-C02 questions linked to SCS-C02 fundamentals.

SCS-C02 scenario practice questions

Practise SCS-C02 questions linked to SCS-C02 scenario.

SCS-C02 troubleshooting practice questions

Practise SCS-C02 questions linked to SCS-C02 troubleshooting.

Practice this exam

Start a free SCS-C02 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

SCS-C02 practice-test guide →Study guide →Browse all practice tests

FAQ

Questions learners often ask

What does this SCS-C02 question test?

Threat Detection and Incident Response — This question tests Threat Detection and Incident Response — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: The Kinesis Data Firehose delivery stream does not have an IAM role with permissions to write to the S3 bucket. — Option B is correct because Kinesis Data Firehose requires an IAM role with permissions to write to the S3 bucket. Even if the bucket policy allows the Firehose service, the delivery stream's IAM role must be granted write access to the bucket. Option A is incorrect because WAF can be configured to log blocked requests; the issue is that logs are not being delivered at all. Option C is incorrect because the bucket policy already allows Firehose, but the IAM role for the delivery stream is separate and must also have permissions. Option D is incorrect because Firehose delivers logs in near real time (typically within 60 seconds), so the delay is not the cause.

What should I do if I get this SCS-C02 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Standard ACLs match source addresses.

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 →

How Courseiva writes practice questions · Editorial policy

Keep practising

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

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.