← SOA-C02·Amazon Web Services

Question 778 of 1,546

Networking and Content Delivery →mediumMultiple ChoiceObjective-mapped

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 an Application Load Balancer (ALB) that routes traffic to Amazon EC2 instances in private subnets of a VPC. The SysOps administrator needs to ensure that the EC2 instances can download software updates from the internet, but they must not be directly accessible from the internet. The solution should minimize operational overhead. Which solution should the administrator implement?

Clue words in this question

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

Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

Question 1mediummultiple choice

Review the full subnetting walkthrough →

A
Place the EC2 instances in a public subnet and configure security group inbound rules to block all traffic.
Why wrong: Instances in a public subnet have direct internet access but are still reachable from the internet if security groups are misconfigured; this does not guarantee the required security posture and does not fully prevent inbound traffic.
B
Attach a NAT Gateway to a public subnet and configure the private subnet route table to send 0.0.0.0/0 traffic to the NAT Gateway.
A NAT Gateway enables outbound internet connectivity for instances in private subnets while blocking unsolicited inbound connections. It is fully managed, reducing operational overhead.
C
Launch a NAT instance in a public subnet with an Elastic IP address and configure route tables accordingly.
Why wrong: A NAT instance can provide similar functionality but requires manual configuration, patching, and scaling, increasing operational overhead. The question prioritizes minimizing overhead.
D
Attach an Internet Gateway to the VPC and add a route to the private subnet route table pointing 0.0.0.0/0 to the Internet Gateway.
Why wrong: Directly routing private subnet traffic to an Internet Gateway would give instances a public IP and expose them to inbound internet traffic, violating the security requirement.

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

✓

Attach a NAT Gateway to a public subnet and configure the private subnet route table to send 0.0.0.0/0 traffic to the NAT Gateway.

A NAT Gateway (option B) allows EC2 instances in private subnets to initiate outbound connections to the internet (e.g., for software updates) while preventing any unsolicited inbound connections from the internet. It is a fully managed AWS service that automatically scales and requires no patching, minimizing operational overhead compared to a NAT instance. The private subnet route table directs 0.0.0.0/0 traffic to the NAT Gateway, which is placed in a public subnet with an Elastic IP address to enable internet access.

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.

✗
Place the EC2 instances in a public subnet and configure security group inbound rules to block all traffic.
Why it's wrong here
Instances in a public subnet have direct internet access but are still reachable from the internet if security groups are misconfigured; this does not guarantee the required security posture and does not fully prevent inbound traffic.
✓
Attach a NAT Gateway to a public subnet and configure the private subnet route table to send 0.0.0.0/0 traffic to the NAT Gateway.
Why this is correct
A NAT Gateway enables outbound internet connectivity for instances in private subnets while blocking unsolicited inbound connections. It is fully managed, reducing operational overhead.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Launch a NAT instance in a public subnet with an Elastic IP address and configure route tables accordingly.
Why it's wrong here
A NAT instance can provide similar functionality but requires manual configuration, patching, and scaling, increasing operational overhead. The question prioritizes minimizing overhead.
✗
Attach an Internet Gateway to the VPC and add a route to the private subnet route table pointing 0.0.0.0/0 to the Internet Gateway.
Why it's wrong here
Directly routing private subnet traffic to an Internet Gateway would give instances a public IP and expose them to inbound internet traffic, violating the security requirement.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may confuse a NAT Gateway with a NAT instance, thinking the latter is acceptable, but the question explicitly requires minimizing operational overhead, which disqualifies the self-managed NAT instance in favor of the fully managed NAT Gateway.

Trap categories for this question

Similar concept trap
A NAT instance can provide similar functionality but requires manual configuration, patching, and scaling, increasing operational overhead. The question prioritizes minimizing overhead.

Detailed technical explanation

How to think about this question

A NAT Gateway operates at Layer 4 (TCP/UDP) and performs source network address translation (SNAT), rewriting the source IP of outbound packets to its own Elastic IP address. It maintains connection state in a connection tracking table, and responses are automatically forwarded back to the originating instance. In contrast, an Internet Gateway attached to a VPC allows bidirectional traffic for instances with public IPs, which is why option D would expose the instances directly.

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.

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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: Attach a NAT Gateway to a public subnet and configure the private subnet route table to send 0.0.0.0/0 traffic to the NAT Gateway. — A NAT Gateway (option B) allows EC2 instances in private subnets to initiate outbound connections to the internet (e.g., for software updates) while preventing any unsolicited inbound connections from the internet. It is a fully managed AWS service that automatically scales and requires no patching, minimizing operational overhead compared to a NAT instance. The private subnet route table directs 0.0.0.0/0 traffic to the NAT Gateway, which is placed in a public subnet with an Elastic IP address to enable internet access.

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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

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.