← ANS-C01·Amazon Web Services

Question 1,007 of 1,705

Network Security, Compliance and Governance →hardMultiple SelectObjective-mapped

Quick Answer

The correct combination is to create an S3 bucket policy using the aws:SourceIp condition key and to configure a VPC endpoint with a policy that restricts access to the specific bucket. This works because the bucket policy directly evaluates the requester’s IP address against your on-premises ranges, blocking any traffic that does not match, while the VPC endpoint policy ensures that even traffic originating inside your VPC—which may appear to come from a NAT gateway’s public IP—can only reach the bucket if it passes through the endpoint and satisfies the same restriction. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of how to combine resource-based policies with network-level controls to enforce IP-based access, a common trap being that EC2 instance IPs are ephemeral and cannot be reliably used in a bucket policy. A useful memory tip is “source IP for on-prem, endpoint for in-VPC”—the bucket policy handles external IPs, while the VPC endpoint policy catches internal traffic that might otherwise bypass the IP check.

ANS-C01 Network Security, Compliance and Governance Practice Question

This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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's security team is designing a solution to restrict S3 bucket access based on the requester's network. The company has a set of on-premises IP ranges and wants to ensure that only requests originating from those IPs can access the bucket. Which combination of actions should be taken? (Choose TWO.)

Question 1hardmulti select

Read the full NAT/PAT explanation →

A
Configure the EC2 instances in the VPC to use Elastic IPs and allow those IPs in the bucket policy
Why wrong: Elastic IPs are public IPs but the requirement is to restrict based on on-premises IPs, not EC2 instance IPs.
B
Create a VPC endpoint for S3 and attach a VPC endpoint policy that restricts access to the specific bucket
This ensures that even if requests originate from the VPC, they must go through the endpoint and be subject to the policy.
C
Use AWS WAF to inspect HTTP requests to the bucket
Why wrong: AWS WAF is for web ACLs on CloudFront or ALB, not directly for S3 bucket access.
D
Enable S3 Block Public Access on the bucket
Why wrong: This blocks all public access but does not restrict based on IP.
E
Create an S3 bucket policy that uses the aws:SourceIp condition to allow access only from the on-premises IP ranges
This directly restricts access based on source IP.

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

✓

Create a VPC endpoint for S3 and attach a VPC endpoint policy that restricts access to the specific bucket

Options A and C are correct. A bucket policy with a source IP condition restricts access to requests from specified IPs. A VPC endpoint with a VPC endpoint policy restricting to the bucket ensures that requests from within the VPC (which may have different IPs due to NAT) are only allowed if they come through the endpoint and meet the policy. Option B is wrong because EC2 instance IPs are dynamic. Option D is wrong because it does not restrict IPs. Option E is wrong because AWS WAF is for web traffic, not S3 access control.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Answer analysis

Option-by-option breakdown

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

✗
Configure the EC2 instances in the VPC to use Elastic IPs and allow those IPs in the bucket policy
Why it's wrong here
Elastic IPs are public IPs but the requirement is to restrict based on on-premises IPs, not EC2 instance IPs.
✓
Create a VPC endpoint for S3 and attach a VPC endpoint policy that restricts access to the specific bucket
Why this is correct
This ensures that even if requests originate from the VPC, they must go through the endpoint and be subject to the policy.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use AWS WAF to inspect HTTP requests to the bucket
Why it's wrong here
AWS WAF is for web ACLs on CloudFront or ALB, not directly for S3 bucket access.
✗
Enable S3 Block Public Access on the bucket
Why it's wrong here
This blocks all public access but does not restrict based on IP.
✓
Create an S3 bucket policy that uses the aws:SourceIp condition to allow access only from the on-premises IP ranges
Why this is correct
This directly restricts access based on source IP.
Related concept
Static NAT maps one inside address to one outside address.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

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.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.

Related ANS-C01 practice-question pages

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

Network Management and Operations practice questions

Practise ANS-C01 questions linked to Network Management and Operations.

Network Security, Compliance and Governance practice questions

Practise ANS-C01 questions linked to Network Security, Compliance and Governance.

Network Design practice questions

Practise ANS-C01 questions linked to Network Design.

Network Implementation practice questions

Practise ANS-C01 questions linked to Network Implementation.

ANS-C01 fundamentals practice questions

Practise ANS-C01 questions linked to ANS-C01 fundamentals.

ANS-C01 scenario practice questions

Practise ANS-C01 questions linked to ANS-C01 scenario.

ANS-C01 troubleshooting practice questions

Practise ANS-C01 questions linked to ANS-C01 troubleshooting.

Practice this exam

Start a free ANS-C01 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

ANS-C01 practice-test guide →Study guide →Browse all practice tests

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 — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Create a VPC endpoint for S3 and attach a VPC endpoint policy that restricts access to the specific bucket — Options A and C are correct. A bucket policy with a source IP condition restricts access to requests from specified IPs. A VPC endpoint with a VPC endpoint policy restricting to the bucket ensures that requests from within the VPC (which may have different IPs due to NAT) are only allowed if they come through the endpoint and meet the policy. Option B is wrong because EC2 instance IPs are dynamic. Option D is wrong because it does not restrict IPs. Option E is wrong because AWS WAF is for web traffic, not S3 access control.

What should I do if I get this ANS-C01 question wrong?

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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

Same concept, more angles

1 more ways this is tested on ANS-C01

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 wants to restrict access to their S3 bucket so that only users from their corporate network (with a specific IP range) can read objects. They also want to ensure that the objects are encrypted in transit. Which combination of bucket policy and encryption should they use?

easy

A.Use a VPC endpoint with a bucket policy that restricts access to the VPC endpoint.
B.Use an IAM policy that restricts access to the corporate IP range and enable default encryption on the bucket.
✓ C.Bucket policy with a condition that denies access unless the source IP is within the corporate range, and require HTTPS for all requests.
D.Enable CloudFront with geographic restrictions and use HTTPS.

Why C: Option C is correct because a bucket policy with a condition key `aws:SourceIp` can restrict access to the corporate IP range, and requiring HTTPS (via a `aws:SecureTransport` condition) ensures encryption in transit. This combination directly meets both requirements without relying on additional infrastructure like VPC endpoints or CloudFront.

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 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.