- A
Custom resources
Why wrong: Custom resources are for provisioning resources not natively supported.
- B
StackSets
Why wrong: StackSets are for deploying stacks across multiple accounts/regions, not for reuse within a single account.
- C
Cross-stack references
Why wrong: Cross-stack references allow passing outputs between stacks but not reusing resource definitions.
- D
Nested stacks
Nested stacks allow a template to reference another template, enabling reuse.
Question 1,542 of 1,750
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. 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 team uses AWS CloudFormation to manage infrastructure. They want to reuse a common set of resources (e.g., VPC, subnets) across multiple stacks. Which CloudFormation feature should they use?
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
✓
Nested stacks
Nested stacks allow you to compose a CloudFormation template from multiple, reusable templates. By creating a parent stack that references child templates (e.g., a VPC template), you can deploy the same set of resources across multiple stacks without duplicating code. This is the correct feature for reusing a common resource set across stacks.
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.
- ✗
Custom resources
Why it's wrong here
Custom resources are for provisioning resources not natively supported.
- ✗
StackSets
Why it's wrong here
StackSets are for deploying stacks across multiple accounts/regions, not for reuse within a single account.
- ✗
Cross-stack references
Why it's wrong here
Cross-stack references allow passing outputs between stacks but not reusing resource definitions.
- ✓
Nested stacks
Why this is correct
Nested stacks allow a template to reference another template, enabling reuse.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse cross-stack references (which share output values) with nested stacks (which share entire resource definitions), leading them to pick Option C when the question asks for reusing a common set of resources.
Trap categories for this question
Command / output trap
Cross-stack references allow passing outputs between stacks but not reusing resource definitions.
Detailed technical explanation
How to think about this question
Nested stacks work by embedding a stack resource (AWS::CloudFormation::Stack) in a parent template, which references a child template URL (S3 or local). The child stack is created as a separate stack within the parent, and outputs from the child can be accessed using Fn::GetAtt. A subtle behavior: nested stacks are limited to 200 child stacks per parent, and each child stack must be in the same region as the parent. In real-world scenarios, teams often use nested stacks to enforce standardized VPC configurations across multiple environments (dev, test, prod) while allowing each environment to have its own parent stack with unique parameters.
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.
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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SDLC Automation — study guide chapter
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Nested stacks — Nested stacks allow you to compose a CloudFormation template from multiple, reusable templates. By creating a parent stack that references child templates (e.g., a VPC template), you can deploy the same set of resources across multiple stacks without duplicating code. This is the correct feature for reusing a common resource set across stacks.
What should I do if I get this DOP-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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Last reviewed: Jul 4, 2026
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