← SOA-C02·Amazon Web Services

Question 832 of 1,546

Deployment, Provisioning, and Automation →hardMultiple ChoiceObjective-mapped

SOA-C02 Deployment, Provisioning, and Automation Practice Question

This SOA-C02 practice question tests your understanding of deployment, provisioning, and automation. 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 a failed AWS CodeBuild build. The build project uses an Amazon S3 source. The buildspec.yml file includes commands that require internet access to download dependencies. The build is failing with a timeout error when trying to download from an external repository. The VPC configuration for the build project uses a private subnet with no NAT gateway. What change should be made to resolve the issue?

A
Attach a NAT gateway to the private subnet's route table.
NAT gateway allows outbound internet access from private subnet.
B
Configure an HTTP proxy in the build project.
Why wrong: A proxy would still need outbound internet access via NAT.
C
Create a VPC endpoint for the external repository.
Why wrong: VPC endpoints are for AWS services, not external repositories.
D
Move the build project to a public subnet with an internet gateway.
Why wrong: This would work but may not be desired if the build must be in a private subnet.

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 the private subnet's route table.

Option A is correct because a NAT gateway provides outbound internet access for resources in a private subnet. The CodeBuild build requires internet access to download dependencies, but the private subnet lacks a NAT gateway, causing timeout errors. Adding a NAT gateway to the subnet's route table enables internet access while keeping the build environment private. Option B is incorrect because an HTTP proxy is not necessary; a NAT gateway is the standard solution for outbound internet access from a private subnet. Option C is incorrect because a VPC endpoint only provides private connectivity to AWS services, not to external internet repositories. Option D is incorrect because moving to a public subnet would expose the build to the internet directly, which is less secure and not the recommended change; adding a NAT gateway preserves the private subnet configuration.

Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
Attach a NAT gateway to the private subnet's route table.
Why this is correct
NAT gateway allows outbound internet access from private subnet.
Related concept
CIDR notation defines the prefix length.
✗
Configure an HTTP proxy in the build project.
Why it's wrong here
A proxy would still need outbound internet access via NAT.
✗
Create a VPC endpoint for the external repository.
Why it's wrong here
VPC endpoints are for AWS services, not external repositories.
✗
Move the build project to a public subnet with an internet gateway.
Why it's wrong here
This would work but may not be desired if the build must be in a private subnet.

Common exam traps

Common exam trap: usable hosts are not the same as total addresses

Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.

Detailed technical explanation

How to think about this question

Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.

KKey Concepts to Remember

CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.

TExam Day Tips

Write the block size before choosing the subnet.
Check whether the question asks for hosts, subnets or a specific address range.
Do not confuse /24, /25, /26 and /27 host counts.

Key takeaway

Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

Real-world example

How this comes up in practice

A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

Visual reference

Quick reference

AWS S3 Storage Class Comparison

Storage Class	Min Duration	Retrieval	Use Case
S3 Standard	None	Immediate	Frequently accessed data
S3 Standard-IA	30 days	Immediate	Infrequent access, rapid retrieval
S3 One Zone-IA	30 days	Immediate	Non-critical infrequent data
S3 Intelligent-Tiering	None	Immediate–hours	Unknown or changing access patterns
S3 Glacier Instant	90 days	Milliseconds	Archive with instant retrieval
S3 Glacier Flexible	90 days	Minutes–hours	Archive, flexible retrieval
S3 Glacier Deep Archive	180 days	Hours	Long-term compliance archive

What to study next

Got this wrong? Here's your next step.

Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SOA-C02 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this SOA-C02 question test?

Deployment, Provisioning, and Automation — This question tests Deployment, Provisioning, and Automation — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Attach a NAT gateway to the private subnet's route table. — Option A is correct because a NAT gateway provides outbound internet access for resources in a private subnet. The CodeBuild build requires internet access to download dependencies, but the private subnet lacks a NAT gateway, causing timeout errors. Adding a NAT gateway to the subnet's route table enables internet access while keeping the build environment private. Option B is incorrect because an HTTP proxy is not necessary; a NAT gateway is the standard solution for outbound internet access from a private subnet. Option C is incorrect because a VPC endpoint only provides private connectivity to AWS services, not to external internet repositories. Option D is incorrect because moving to a public subnet would expose the build to the internet directly, which is less secure and not the recommended change; adding a NAT gateway preserves the private subnet configuration.

What should I do if I get this SOA-C02 question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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