The answer is a NAT Gateway deployed in a public subnet. This is correct because instances in private subnets cannot directly reach the internet; they need a NAT device to translate their private IP addresses to the public IP of the gateway for outbound traffic. A route table associated with the private subnets must include a default route (0.0.0.0/0) pointing to the NAT Gateway, which resides in a public subnet with an Internet Gateway attached, enabling the outbound internet connection while blocking unsolicited inbound traffic. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of VPC networking fundamentals and high-availability design—common traps include forgetting that the NAT Gateway itself must be in a public subnet or that you need two NAT Gateways for multi-AZ resilience. A helpful memory tip: “NAT in public, route from private” ensures the traffic flows correctly for updates and patches.
SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. 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 private subnets need outbound internet access for EC2 instances to download updates. Which THREE components are required to achieve this? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Route table in the private subnets with a default route pointing to the NAT Gateway
Option A is correct because a route table associated with private subnets must have a default route (0.0.0.0/0) pointing to a NAT Gateway to direct outbound internet traffic from EC2 instances through the NAT device. This allows instances in private subnets to initiate outbound connections to the internet (e.g., for software updates) while preventing unsolicited inbound connections 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.
✓
Route table in the private subnets with a default route pointing to the NAT Gateway
Read the scenario before looking for a memorised answer.
✓
Internet Gateway attached to the VPC
Why this is correct
The IGW provides the path for the NATGateway to the internet.
Related concept
Read the scenario before looking for a memorised answer.
✗
Egress-only Internet Gateway
Why it's wrong here
Used for IPv6 traffic only.
✓
NAT Gateway in a public subnet
Why this is correct
NATGateway allows private instances to initiate outbound traffic.
Related concept
Read the scenario before looking for a memorised answer.
✗
AWS Site-to-Site VPN connection
Why it's wrong here
VPN is for hybrid connectivity, not outbound internet access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the Egress-Only Internet Gateway (IPv6 only) with the NAT Gateway (IPv4) or think a VPN connection can provide internet access, when in fact a NAT Gateway in a public subnet plus an Internet Gateway are required for IPv4 outbound connectivity from private subnets.
Detailed technical explanation
How to think about this question
A NATGateway operates at the network layer, performing source network address translation (SNAT) by replacing the private source IP of EC2 instances with the NAT Gateway's Elastic IP address for outbound traffic. It maintains connection state so that response traffic is correctly forwarded back to the originating instance, but it does not allow inbound connections from the internet unless explicitly initiated from the private subnet. In a real-world scenario, if the NAT Gateway is placed in a public subnet without an Internet Gateway attached to the VPC, outbound traffic will fail because the NAT Gateway itself needs the Internet Gateway to reach the internet.
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
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.
Networking and Content Delivery — This question tests Networking and Content Delivery — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Route table in the private subnets with a default route pointing to the NAT Gateway — Option A is correct because a route table associated with private subnets must have a default route (0.0.0.0/0) pointing to a NAT Gateway to direct outbound internet traffic from EC2 instances through the NAT device. This allows instances in private subnets to initiate outbound connections to the internet (e.g., for software updates) while preventing unsolicited inbound connections from the internet.
What should I do if I get this SOA-C02 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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This SOA-C02 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 SOA-C02 exam.
Question Discussion
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