The correct answer is to use a single StackSet with parameter overrides per account, because AWS CloudFormation StackSets natively support overriding parameters at the stack instance level, allowing you to deploy one template across multiple accounts while specifying unique CIDR blocks for each target account or organizational unit. This is the most efficient approach as it avoids duplicating StackSets or templates, reducing management overhead and ensuring consistent infrastructure. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this concept tests your understanding of multi-account governance and parameterized deployments; a common trap is assuming you need separate StackSets for each variation, which increases complexity. Remember that parameter overrides are applied directly in the StackSet instance configuration, not in the template itself. Memory tip: think “one template, many overrides” — like a single recipe with custom ingredient amounts per kitchen.
DOP-C02 Configuration Management and IaC Practice Question
This DOP-C02 practice question tests your understanding of configuration management and iac. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
An organization manages multiple AWS accounts using AWS Organizations. They want to use AWS CloudFormation StackSets to deploy a standard VPC configuration across all accounts. However, some accounts require specific CIDR blocks that differ from the default. What is the most efficient way to handle this variation?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a single StackSet with parameters and pass account-specific parameter files via AWS CloudFormation parameter overrides in the StackSet instance.
Option C is correct because AWS CloudFormation StackSets support parameter overrides at the stack instance level, allowing you to deploy a single StackSet template across multiple accounts while specifying account-specific CIDR blocks without duplicating infrastructure. This approach minimizes management overhead by using one template and one StackSet, with parameter overrides applied per target account or organizational unit (OU) via the StackSet instance configuration.
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.
✗
Create separate StackSets for each CIDR range and assign accounts accordingly.
Why it's wrong here
Multiple stack sets defeat the purpose of standardization.
✗
Create a nested stack for each account that overrides the default parameters.
Why it's wrong here
Nested stacks add complexity and are less efficient.
✓
Use a single StackSet with parameters and pass account-specific parameter files via AWS CloudFormation parameter overrides in the StackSet instance.
Read the scenario before looking for a memorised answer.
✗
Maintain separate templates per account with hardcoded CIDR blocks.
Why it's wrong here
Hardcoding is inflexible and increases maintenance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse StackSet parameter overrides with nested stacks or separate templates, not realizing that StackSets natively support per-instance parameter values without requiring multiple StackSets or template duplication.
Detailed technical explanation
How to think about this question
Under the hood, StackSets use a single CloudFormation template deployed as a stack in each target account; parameter overrides are stored as part of the stack instance metadata and are applied during create or update operations. This mechanism leverages the same template but allows per-instance parameter values, which is particularly useful when accounts belong to different OUs with varying network requirements. In real-world scenarios, you might combine this with AWS Organizations tags to dynamically assign CIDR overrides based on account attributes, further automating the deployment.
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.
Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a single StackSet with parameters and pass account-specific parameter files via AWS CloudFormation parameter overrides in the StackSet instance. — Option C is correct because AWS CloudFormation StackSets support parameter overrides at the stack instance level, allowing you to deploy a single StackSet template across multiple accounts while specifying account-specific CIDR blocks without duplicating infrastructure. This approach minimizes management overhead by using one template and one StackSet, with parameter overrides applied per target account or organizational unit (OU) via the StackSet instance configuration.
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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Question Discussion
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