- A
Configure NAT64 on the VPC to translate IPv6 to IPv4.
Why wrong: NAT64 is for IPv6 to IPv4 translation, not needed for native IPv6 access.
- B
Enable route propagation for the egress-only internet gateway in the route table.
Why wrong: Route propagation does not apply to egress-only internet gateways; routes are static.
- C
Add a default route (::/0) in the private subnet's route table pointing to the egress-only internet gateway.
This allows IPv6 traffic from the private subnet to reach the internet outbound.
- D
Assign an IPv6 address to the egress-only internet gateway.
Why wrong: Egress-only internet gateways do not have IPv6 addresses; they are virtual devices.
Question 87 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 has a VPC with an IPv6 CIDR block and wants to provide internet access to instances in a private subnet using an egress-only internet gateway. Which of the following must be configured correctly?
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
✓
Add a default route (::/0) in the private subnet's route table pointing to the egress-only internet gateway.
An egress-only internet gateway (EIG) is a horizontally scaled, redundant VPC component that allows outbound-only IPv6 traffic from instances in a private subnet to the internet, while preventing unsolicited inbound connections. To use it, you must add a default route (::/0) in the private subnet's route table pointing to the EIG, which directs all outbound IPv6 traffic through the gateway. This configuration ensures that instances can initiate outbound IPv6 connections (e.g., to download updates) but cannot be reached from the internet.
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 NAT64 on the VPC to translate IPv6 to IPv4.
Why it's wrong here
NAT64 is for IPv6 to IPv4 translation, not needed for native IPv6 access.
- ✗
Enable route propagation for the egress-only internet gateway in the route table.
Why it's wrong here
Route propagation does not apply to egress-only internet gateways; routes are static.
- ✓
Add a default route (::/0) in the private subnet's route table pointing to the egress-only internet gateway.
Why this is correct
This allows IPv6 traffic from the private subnet to reach the internet outbound.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Assign an IPv6 address to the egress-only internet gateway.
Why it's wrong here
Egress-only internet gateways do not have IPv6 addresses; they are virtual devices.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that an egress-only internet gateway requires an IPv6 address assignment or that it behaves like a NAT gateway for IPv6, leading candidates to choose Option D or Option A, when in fact it is a stateless gateway that only requires a route table entry.
Detailed technical explanation
How to think about this question
Under the hood, an egress-only internet gateway uses a NAT-like mechanism at the AWS edge, rewriting the source IPv6 address of outbound packets to a public IPv6 address from AWS's pool, while dropping any inbound traffic that is not part of an established outbound session. This behavior is analogous to a stateful firewall for IPv6, but unlike a NAT gateway for IPv4, it does not perform port address translation (PAT) because IPv6 addresses are abundant. In a real-world scenario, if you have a dual-stack VPC and want to allow instances in a private subnet to fetch security updates from IPv6-enabled repositories without exposing them to inbound SSH or HTTP requests, the EIG with a ::/0 route is the correct solution.
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.
Visual reference
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: Add a default route (::/0) in the private subnet's route table pointing to the egress-only internet gateway. — An egress-only internet gateway (EIG) is a horizontally scaled, redundant VPC component that allows outbound-only IPv6 traffic from instances in a private subnet to the internet, while preventing unsolicited inbound connections. To use it, you must add a default route (::/0) in the private subnet's route table pointing to the EIG, which directs all outbound IPv6 traffic through the gateway. This configuration ensures that instances can initiate outbound IPv6 connections (e.g., to download updates) but cannot be reached from the internet.
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.