The best approach is to use the Fn::GetAZs function combined with Fn::Select to distribute subnets across different Availability Zones. This is correct because Fn::GetAZs dynamically returns a list of all AZs in the current region, and Fn::Select allows you to pick specific indices from that list—such as index 0 for the first subnet and index 1 for the second—ensuring each subnet lands in a distinct AZ without hardcoding names. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this pattern tests your understanding of writing region-agnostic templates that maintain high availability; a common trap is to hardcode AZ names like us-east-1a, which breaks in other regions or if AZs change. The key insight is that Fn::GetAZs returns an ordered list, so using different indices guarantees separation. Memory tip: think “GetAZs for the list, Select for the index” to always keep subnets in different zones.
DOP-C02 Configuration Management and IaC Practice Question
This DOP-C02 practice question tests your understanding of configuration management and iac. 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 DevOps engineer is creating a CloudFormation template to deploy a VPC with public and private subnets. The template uses the 'AWS::EC2::VPC' resource and two 'AWS::EC2::Subnet' resources. The engineer wants to ensure that the subnets are created in different Availability Zones. What is the best approach?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Fn::GetAZs function with Fn::Select to pick different AZs from the region's AZ list.
Option A is correct because Fn::GetAZs returns a list of all Availability Zones in the region, and Fn::Select allows you to pick specific indices from that list, ensuring each subnet is assigned a different AZ. This approach is dynamic and region-agnostic, so the template works across regions without hardcoding AZ names. It also avoids the risk of using the same AZ for both subnets, which would violate the requirement for high availability.
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.
✓
Use Fn::GetAZs function with Fn::Select to pick different AZs from the region's AZ list.
Why this is correct
Ensures different AZs dynamically.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use the CidrBlock property to define different AZs.
Why it's wrong here
CidrBlock does not determine AZ.
✗
Use Fn::GetAZs function with a count of 2 to automatically assign different AZs.
Why it's wrong here
Fn::GetAZs returns a list; count is not used.
✗
Hardcode the Availability Zone names in the template.
Why it's wrong here
Reduces template reusability across regions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the CidrBlock property with AZ assignment, or assume Fn::GetAZs can directly return multiple AZs without using Fn::Select, leading them to pick option B or C.
Detailed technical explanation
How to think about this question
Fn::GetAZs returns a comma-delimited string of AZ names (e.g., 'us-east-1a,us-east-1b,us-east-1c'), which can be split into a list using Fn::Split if needed. Fn::Select then extracts an element by zero-based index, so using indices 0 and 1 ensures distinct AZs. A common real-world scenario is deploying across multiple regions where AZ names differ (e.g., 'us-west-2a' vs 'ap-southeast-1a'), and this dynamic approach avoids manual mapping. Note that if a region has only one AZ, this method will fail at deployment, so you should also validate AZ count or use a mapping for fallback.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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 Fn::GetAZs function with Fn::Select to pick different AZs from the region's AZ list. — Option A is correct because Fn::GetAZs returns a list of all Availability Zones in the region, and Fn::Select allows you to pick specific indices from that list, ensuring each subnet is assigned a different AZ. This approach is dynamic and region-agnostic, so the template works across regions without hardcoding AZ names. It also avoids the risk of using the same AZ for both subnets, which would violate the requirement for high availability.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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