The correct answer is to use the S3 IP prefix list from AWS to create firewall rules. This works because AWS publishes JSON-based prefix lists that contain the current public IP ranges for each service, including S3, allowing you to precisely restrict on-premises firewall rules to only those prefixes rather than guessing a single IP address. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of how a Direct Connect public VIF routes traffic to public AWS endpoints like S3, and the common trap is assuming S3 has a static IP or that a private VIF can replace it. Remember, a public VIF is for public services, and S3’s IP range is dynamic, so you must use the prefix list—not a single IP. Memory tip: “Public VIF, public list—S3’s IPs never stay fixed.”
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 company is using AWS Direct Connect with a public virtual interface to access Amazon S3. The on-premises network has a firewall that only allows traffic to specific IP prefixes. What is the best practice to ensure connectivity while maintaining security?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the S3 IP prefix list from AWS to create firewall rules.
Option C is correct because using the S3 public IP prefix list from AWS allows you to restrict traffic to known S3 IPs. Option A is wrong because S3 does not have a single IP. Option B is wrong because a private VIF is for VPC access, not S3. Option D is wrong because a VPN does not replace Direct Connect.
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.
Set up a Site-to-Site VPN tunnel over Direct Connect.
Why it's wrong here
VPN over Direct Connect is not needed for S3 access.
✗
Use a private virtual interface and connect through a VPC endpoint.
Why it's wrong here
Private VIF is for VPC, not direct S3 access.
✓
Use the S3 IP prefix list from AWS to create firewall rules.
Why this is correct
Prefix lists provide specific S3 IP addresses.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
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.
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use the S3 IP prefix list from AWS to create firewall rules. — Option C is correct because using the S3 public IP prefix list from AWS allows you to restrict traffic to known S3 IPs. Option A is wrong because S3 does not have a single IP. Option B is wrong because a private VIF is for VPC access, not S3. Option D is wrong because a VPN does not replace Direct Connect.
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.
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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.
Question Discussion
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