SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. 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 SysOps administrator is troubleshooting an issue where an EC2 instance in a private subnet cannot connect to the internet via a NAT Gateway. Which TWO components must be correctly configured for this to work? (Select TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The NAT Gateway must be placed in a public subnet with a route to an Internet Gateway.
The NATGateway must reside in a public subnet because it needs a direct route to an Internet Gateway (IGW) to translate private IP addresses to the NAT Gateway's Elastic IP for outbound internet traffic. Without this placement and route, the NAT Gateway cannot forward traffic to the internet, breaking connectivity for instances in private subnets.
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.
✗
The network ACL for the private subnet must have a rule allowing inbound traffic from the NAT Gateway.
Why it's wrong here
NACLs are stateless; outbound rules matter for outbound traffic.
✓
The NAT Gateway must be placed in a public subnet with a route to an Internet Gateway.
Read the scenario before looking for a memorised answer.
✓
The route table for the private subnet must have a default route (0.0.0.0/0) pointing to the NAT Gateway.
Why this is correct
This directs internet-bound traffic to the NATGateway.
Related concept
Read the scenario before looking for a memorised answer.
✗
The EC2 instance must have a public IP address.
Why it's wrong here
Private instances do not need public IP; they use NAT.
✗
The security group for the EC2 instance must allow inbound traffic on port 80.
Why it's wrong here
Inbound rules are for incoming traffic, not outbound.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the placement requirement for a NATGateway with that of a NAT Instance, thinking a NAT Gateway can be in a private subnet, or they incorrectly assume the private subnet's NACL needs an inbound rule from the NAT Gateway instead of focusing on outbound rules and route tables.
Detailed technical explanation
How to think about this question
Under the hood, the NAT Gateway uses source network address translation (SNAT) to replace the instance's private IP with its own Elastic IP when sending packets to the internet. The private subnet's route table must have a default route (0.0.0.0/0) pointing to the NAT Gateway's ENI, and the NAT Gateway's public subnet must have a default route pointing to the IGW. A common real-world scenario is when the NAT Gateway is accidentally placed in a private subnet, causing traffic to fail silently because the gateway has no path to 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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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: The NAT Gateway must be placed in a public subnet with a route to an Internet Gateway. — The NAT Gateway must reside in a public subnet because it needs a direct route to an Internet Gateway (IGW) to translate private IP addresses to the NAT Gateway's Elastic IP for outbound internet traffic. Without this placement and route, the NAT Gateway cannot forward traffic to the internet, breaking connectivity for instances in private subnets.
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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Question Discussion
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