- A
NAT Gateway
NAT Gateway provides outbound internet without inbound.
- B
Elastic IP Address (EIP)
Why wrong: EIP is an IP address, not a service for outbound access.
- C
Internet Gateway (IGW)
Why wrong: IGW allows inbound internet traffic.
- D
Virtual Private Gateway (VGW)
Why wrong: VGW is for VPN connections.
Question 649 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 network engineer is designing a VPC with public and private subnets. The private subnets must have outbound internet access but not be directly reachable from the internet. Which AWS service should be used?
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
✓
NAT Gateway
A NAT Gateway is the correct choice because it enables instances in private subnets to initiate outbound internet traffic (e.g., for software updates) while preventing the internet from initiating inbound connections to those instances. It translates the private IP addresses of the instances to the NAT Gateway's Elastic IP address, providing one-way internet access without direct reachability.
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.
- ✓
NAT Gateway
- ✗
Elastic IP Address (EIP)
Why it's wrong here
EIP is an IP address, not a service for outbound access.
- ✗
Internet Gateway (IGW)
Why it's wrong here
IGW allows inbound internet traffic.
- ✗
Virtual Private Gateway (VGW)
Why it's wrong here
VGW is for VPN connections.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse a NAT Gateway with an Internet Gateway, mistakenly thinking an IGW can provide outbound-only access, when in fact an IGW allows bidirectional traffic and would expose private subnets to the internet.
Detailed technical explanation
How to think about this question
A NAT Gateway operates at the network layer (Layer 3) and performs source network address translation (SNAT) by replacing the source IP of outbound packets with its own Elastic IP address, while maintaining stateful connection tracking to route return traffic back to the originating instance. It supports TCP, UDP, and ICMP protocols, but does not support IP fragmentation or port forwarding. In a real-world scenario, if a NAT Gateway is placed in a single Availability Zone and that zone fails, all private instances lose outbound internet access unless a second NAT Gateway is deployed in another AZ for high availability.
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
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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: NAT Gateway — A NAT Gateway is the correct choice because it enables instances in private subnets to initiate outbound internet traffic (e.g., for software updates) while preventing the internet from initiating inbound connections to those instances. It translates the private IP addresses of the instances to the NAT Gateway's Elastic IP address, providing one-way internet access without direct reachability.
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: 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.
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