- A
Outputs
Why wrong: Outputs return stack values.
- B
Parameters with AllowedValues
AllowedValues restricts parameter input to a list.
- C
Conditions
Why wrong: Conditions control resource creation based on conditions.
- D
Mappings
Why wrong: Mappings are used for lookup tables.
Question 1,657 of 1,750
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.
A company uses AWS CloudFormation to deploy a multi-tier application. The template includes a parameter for the instance type of EC2 instances. The DevOps team wants to restrict the allowed values to a specific set of instance types. Which CloudFormation section should be used?
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
✓
Parameters with AllowedValues
The Parameters section in AWS CloudFormation allows you to define input values that can be supplied at stack creation or update time. By specifying an AllowedValues constraint on a parameter, you restrict the user to select only from a predefined list of instance types, which enforces compliance and prevents misconfiguration. This is the correct mechanism for limiting instance type choices in a CloudFormation template.
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.
- ✗
Outputs
Why it's wrong here
Outputs return stack values.
- ✓
Parameters with AllowedValues
Why this is correct
AllowedValues restricts parameter input to a list.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Conditions
Why it's wrong here
Conditions control resource creation based on conditions.
- ✗
Mappings
Why it's wrong here
Mappings are used for lookup tables.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse Mappings (which are static lookups) with parameter constraints, thinking they can restrict input values via a mapping, but Mappings only retrieve pre-defined data and do not enforce input validation.
Trap categories for this question
Command / output trap
Outputs return stack values.
Detailed technical explanation
How to think about this question
Under the hood, the AllowedValues constraint is enforced by the CloudFormation service during stack creation or update; if a user supplies a value not in the list, the API returns a validation error before any resources are provisioned. This constraint can be combined with other parameter properties like AllowedPattern (regex) or MinLength/MaxLength for strings, but for instance types, AllowedValues is the most direct approach. In real-world scenarios, teams often combine AllowedValues with a Mapping that maps instance types to their respective AMI IDs or pricing tiers to further automate configuration.
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 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.
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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Configuration Management and IaC — study guide chapter
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
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: Parameters with AllowedValues — The Parameters section in AWS CloudFormation allows you to define input values that can be supplied at stack creation or update time. By specifying an AllowedValues constraint on a parameter, you restrict the user to select only from a predefined list of instance types, which enforces compliance and prevents misconfiguration. This is the correct mechanism for limiting instance type choices in a CloudFormation template.
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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