- A
Configure a security group that allows outbound traffic to 0.0.0.0/0
Why wrong: Security groups control traffic but do not provide a route to the internet; a NAT gateway or similar is needed.
- B
Launch the tasks in private subnets that do not have a route to an Internet Gateway
Private subnets ensure no public IPs are assigned; outbound traffic goes through the NAT gateway.
- C
Create a NAT gateway in a public subnet and update the route tables for the task subnets to route 0.0.0.0/0 traffic to the NAT gateway
The NAT gateway provides outbound internet access, and tasks remain in private subnets without public IPs.
- D
Launch the tasks in public subnets with auto-assign public IP enabled
Why wrong: This would assign public IPs to tasks, which the company wants to avoid.
- E
Create a VPC Gateway Endpoint for Amazon ECR
Why wrong: A Gateway Endpoint provides private access to ECR and S3, but not general internet access.
Quick Answer
The correct answer is to create a NAT gateway in a public subnet and update the route tables for the task subnets to route 0.0.0.0/0 traffic to that NAT gateway. This works because ECS Fargate tasks in private subnets lack a direct route to an internet gateway, so they cannot reach the internet on their own; a NAT gateway, residing in a public subnet with an attached internet gateway, translates their private IPs to its own public IP, enabling outbound-only internet access without assigning public IPs to the tasks. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of how to architect private subnet connectivity while maintaining security—a common trap is confusing a NAT gateway with a NAT instance or forgetting that the NAT gateway itself must be in a public subnet with a default route to an internet gateway. A reliable memory tip: “NAT in public, tasks in private, route 0.0.0.0/0 to the NAT.”
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. 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 is deploying a containerized application on Amazon ECS using the Fargate launch type. The application requires outbound internet access to download updates, but the company does not want to assign public IP addresses to the tasks. Which TWO actions should the company take to provide internet access to the tasks? (Choose two.)
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
Launch the tasks in private subnets that do not have a route to an Internet Gateway
Option B is correct because tasks in private subnets without a route to an Internet Gateway cannot directly access the internet, which is the desired behavior to avoid public IP addresses. Option C is correct because a NAT gateway in a public subnet provides outbound internet access for tasks in private subnets by translating their private IP addresses to the NAT gateway's public IP, allowing them to reach the internet without assigning public IPs to the tasks.
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.
- ✗
Configure a security group that allows outbound traffic to 0.0.0.0/0
- ✓
Launch the tasks in private subnets that do not have a route to an Internet Gateway
- ✓
Create a NAT gateway in a public subnet and update the route tables for the task subnets to route 0.0.0.0/0 traffic to the NAT gateway
- ✗
Launch the tasks in public subnets with auto-assign public IP enabled
Why it's wrong here
This would assign public IPs to tasks, which the company wants to avoid.
- ✗
Create a VPC Gateway Endpoint for Amazon ECR
Why it's wrong here
A Gateway Endpoint provides private access to ECR and S3, but not general internet access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that a security group rule allowing outbound traffic to 0.0.0.0/0 alone is sufficient for internet access, when in fact the subnet's route table must direct traffic to a NAT gateway or Internet Gateway.
Trap categories for this question
Similar concept trap
Security groups control traffic but do not provide a route to the internet; a NAT gateway or similar is needed.
Detailed technical explanation
How to think about this question
A NAT gateway operates at the network layer (Layer 3) by performing source network address translation (SNAT) on outbound traffic, replacing the private source IP with its own public IP, and then forwarding responses back to the private instance. In contrast, an Internet Gateway (IGW) provides bidirectional connectivity for instances with public IPs, but tasks in private subnets cannot use an IGW directly. The route table for the private subnet must have a default route (0.0.0.0/0) pointing to the NAT gateway's elastic network interface, and the NAT gateway itself must reside in a public subnet with a route to an IGW.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Launch the tasks in private subnets that do not have a route to an Internet Gateway — Option B is correct because tasks in private subnets without a route to an Internet Gateway cannot directly access the internet, which is the desired behavior to avoid public IP addresses. Option C is correct because a NAT gateway in a public subnet provides outbound internet access for tasks in private subnets by translating their private IP addresses to the NAT gateway's public IP, allowing them to reach the internet without assigning public IPs to the tasks.
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.
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Last reviewed: Jun 30, 2026
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