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Question 170 of 1,546

Networking and Content Delivery →hardMultiple ChoiceObjective-mapped

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.

Instances in a private subnet need outbound internet access for software updates. The route table sends 0.0.0.0/0 to a NAT gateway, but updates fail. Which condition should you check first?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

A
Confirm the NAT gateway is in a public subnet whose route table has 0.0.0.0/0 to an internet gateway.
Without an IGW route from the NAT gateway subnet, outbound internet access fails.
B
Attach an internet gateway directly to the private subnet instances.
Why wrong: Instances in private subnets should not require public IPs or direct IGW routes for NAT egress.
C
Replace all security groups with network ACLs.
Why wrong: NACLs do not provide NAT functionality.
D
Enable VPC peering to another account.
Why wrong: VPC peering is unrelated to internet egress through NAT.

Full breakdown with real-world context →

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

✓

Confirm the NAT gateway is in a public subnet whose route table has 0.0.0.0/0 to an internet gateway.

A NAT gateway must reside in a public subnet with a route table entry directing 0.0.0.0/0 to an internet gateway (IGW). Without this, the NAT gateway cannot translate private IPs to the IGW's public IP, so outbound traffic from private instances fails. This is the most common root cause for failed internet access through a NAT gateway.

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.

✓
Confirm the NAT gateway is in a public subnet whose route table has 0.0.0.0/0 to an internet gateway.
Why this is correct
Without an IGW route from the NAT gateway subnet, outbound internet access fails.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Attach an internet gateway directly to the private subnet instances.
Why it's wrong here
Instances in private subnets should not require public IPs or direct IGW routes for NAT egress.
✗
Replace all security groups with network ACLs.
Why it's wrong here
NACLs do not provide NAT functionality.
✗
Enable VPC peering to another account.
Why it's wrong here
VPC peering is unrelated to internet egress through NAT.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates assume any subnet with a NAT gateway automatically has internet access, overlooking the requirement that the NAT gateway itself must be in a public subnet with a default route to an internet gateway.

Detailed technical explanation

How to think about this question

A NAT gateway uses source network address translation (SNAT) to replace the private source IP with its own Elastic IP (EIP) for outbound traffic. The IGW in the public subnet must be the next hop for the NAT gateway's traffic; otherwise, the NAT gateway cannot reach the internet to forward responses back. In real-world scenarios, misplacing the NAT gateway in a private subnet or omitting the IGW route is a frequent misconfiguration that breaks updates for auto-scaling groups or EC2 instances in private subnets.

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.

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FAQ

Questions learners often ask

What does this SOA-C02 question test?

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: Confirm the NAT gateway is in a public subnet whose route table has 0.0.0.0/0 to an internet gateway. — A NAT gateway must reside in a public subnet with a route table entry directing 0.0.0.0/0 to an internet gateway (IGW). Without this, the NAT gateway cannot translate private IPs to the IGW's public IP, so outbound traffic from private instances fails. This is the most common root cause for failed internet access through a NAT gateway.

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.

Are there clue words in this question I should notice?

Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

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.