- A
Deploy a NAT Gateway in each public subnet and route traffic from private subnets through it.
Why wrong: Incurs hourly and data processing charges.
- B
Use AWS Transit Gateway to route traffic to S3 via a centralized VPN.
Why wrong: Over-engineered and costly for a single VPC.
- C
Attach an Internet Gateway to the VPC and assign public IPs to the EC2 instances.
Why wrong: Exposes instances to the internet, less secure.
- D
Create a VPC Gateway Endpoint for S3 and attach it to the private subnet route tables.
Cost-effective and secure; no data transfer costs.
Question 1,033 of 1,705
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 has a VPC with public and private subnets in two Availability Zones. The company hosts a web application on EC2 instances in the private subnets. The application needs to access an S3 bucket. What is the MOST cost-effective and secure way to provide this access?
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 Gateway Endpoint for S3 and attach it to the private subnet route tables.
Option D is correct because a VPC Gateway Endpoint for S3 provides private, secure connectivity to S3 without traversing the public internet, and it incurs no hourly or data processing charges, making it the most cost-effective and secure choice. Traffic stays within the AWS network, and the endpoint is attached to the private subnet route tables, allowing EC2 instances in those subnets to access S3 directly without needing a NAT Gateway or public 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.
- ✗
Deploy a NAT Gateway in each public subnet and route traffic from private subnets through it.
Why it's wrong here
Incurs hourly and data processing charges.
- ✗
Use AWS Transit Gateway to route traffic to S3 via a centralized VPN.
Why it's wrong here
Over-engineered and costly for a single VPC.
- ✗
Attach an Internet Gateway to the VPC and assign public IPs to the EC2 instances.
Why it's wrong here
Exposes instances to the internet, less secure.
- ✓
Create a VPC Gateway Endpoint for S3 and attach it to the private subnet route tables.
Why this is correct
Cost-effective and secure; no data transfer costs.
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 VPC Gateway Endpoints with Interface Endpoints or assume a NAT Gateway is required for private subnet internet access, overlooking that S3 can be accessed privately and cost-effectively via a Gateway Endpoint without any NAT or internet gateway.
Detailed technical explanation
How to think about this question
A VPC Gateway Endpoint uses AWS PrivateLink to route S3 traffic through the AWS backbone, bypassing the internet entirely, and is implemented as a prefix list in the route table with a destination of the S3 service (e.g., com.amazonaws.region.s3). Unlike Interface Endpoints, Gateway Endpoints do not require Elastic IPs or NAT devices and are free of charge, though standard S3 data transfer costs apply. In real-world scenarios, this is ideal for workloads like batch processing or data lakes where EC2 instances in private subnets need frequent, high-volume access to S3 without egress costs.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Visual reference
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.
- →
Network Implementation — study guide chapter
Learn the concepts, then practise the questions
- →
Network Implementation practice questions
Targeted practice on this topic area only
- →
All ANS-C01 questions
1,705 questions across all exam domains
- →
AWS Certified Advanced Networking Specialty ANS-C01 study guide
Full concept coverage aligned to exam objectives
- →
ANS-C01 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
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.
FAQ
Questions learners often ask
What does this ANS-C01 question test?
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: Create a VPC Gateway Endpoint for S3 and attach it to the private subnet route tables. — Option D is correct because a VPC Gateway Endpoint for S3 provides private, secure connectivity to S3 without traversing the public internet, and it incurs no hourly or data processing charges, making it the most cost-effective and secure choice. Traffic stays within the AWS network, and the endpoint is attached to the private subnet route tables, allowing EC2 instances in those subnets to access S3 directly without needing a NAT Gateway or public IPs.
What should I do if I get this ANS-C01 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.
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 →
Keep practising
More ANS-C01 practice questions
- A financial services company has a VPC with a public subnet and a private subnet. EC2 instances in the private subnet ne…
- A company is designing a network security architecture for a multi-account environment using AWS Transit Gateway. The se…
- A company is using AWS Direct Connect to connect its on-premises network to AWS. The company wants to encrypt all traffi…
- A company uses AWS Transit Gateway to connect multiple VPCs and on-premises networks via AWS Site-to-Site VPN. The secur…
- A company runs a web application on EC2 instances behind an Application Load Balancer (ALB). The application must be acc…
- A global e-commerce company uses a hub-and-spoke network topology with a transit VPC in us-east-1. Each spoke VPC has an…
Last reviewed: Jul 4, 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.
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.
Sign in to join the discussion.