- A
App tier security group: inbound from 0.0.0.0/0 on port 8080.
Why wrong: The app tier should not be directly accessible from the internet; it should only accept traffic from the web tier.
- B
Database tier security group: inbound from the web tier security group on port 3306.
Why wrong: The database tier should only accept traffic from the app tier, not directly from the web tier.
- C
App tier security group: inbound from the web tier security group on port 8080.
The app tier should only accept traffic from the web tier.
- D
Web tier security group: inbound from 0.0.0.0/0 on port 443.
The web tier must accept HTTPS traffic from the internet.
- E
Database tier security group: inbound from 0.0.0.0/0 on port 3306.
Why wrong: The database tier should never be accessible from the internet.
Quick Answer
The correct answer is to allow inbound HTTPS traffic from 0.0.0.0/0 on the web tier security group and to allow inbound traffic from the web tier security group to the app tier security group. This configuration enforces the principle of least privilege by ensuring that only the web layer is exposed to the internet, while the application and database layers remain isolated and only accept traffic from the immediate upstream tier. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of security group chaining and layered defense in a three-tier architecture, a common scenario for designing secure, scalable applications. A frequent trap is allowing the database tier to accept traffic directly from the web tier, which bypasses the app tier and violates the intended isolation. Remember the memory tip: “Web from world, app from web, DB from app”—each tier only trusts the one directly above it.
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 company is designing a security group configuration for a three-tier web application (web, application, database). The web tier is accessible from the internet. Which TWO rules should be applied to meet security best practices?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
App tier security group: inbound from the web tier security group on port 8080.
For a three-tier architecture, the web tier security group should allow inbound from the internet (0.0.0.0/0 on HTTP/HTTPS). The app tier security group should allow inbound only from the web tier security group. The database tier should allow inbound only from the app tier security group. Options A and C are correct. Option B (app tier from 0.0.0.0/0) is wrong. Option D (database tier from web tier) bypasses the app tier. Option E (database tier from 0.0.0.0/0) is wrong.
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.
- ✗
App tier security group: inbound from 0.0.0.0/0 on port 8080.
Why it's wrong here
The app tier should not be directly accessible from the internet; it should only accept traffic from the web tier.
- ✗
Database tier security group: inbound from the web tier security group on port 3306.
Why it's wrong here
The database tier should only accept traffic from the app tier, not directly from the web tier.
- ✓
App tier security group: inbound from the web tier security group on port 8080.
Why this is correct
The app tier should only accept traffic from the web tier.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Web tier security group: inbound from 0.0.0.0/0 on port 443.
Why this is correct
The web tier must accept HTTPS traffic from the internet.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Database tier security group: inbound from 0.0.0.0/0 on port 3306.
Why it's wrong here
The database tier should never be accessible from the internet.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
What to study next
Got this wrong? Here's your next step.
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: App tier security group: inbound from the web tier security group on port 8080. — For a three-tier architecture, the web tier security group should allow inbound from the internet (0.0.0.0/0 on HTTP/HTTPS). The app tier security group should allow inbound only from the web tier security group. The database tier should allow inbound only from the app tier security group. Options A and C are correct. Option B (app tier from 0.0.0.0/0) is wrong. Option D (database tier from web tier) bypasses the app tier. Option E (database tier from 0.0.0.0/0) is wrong.
What should I do if I get this ANS-C01 question wrong?
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 20, 2026
This ANS-C01 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 ANS-C01 exam.
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