- A
The update template must be valid and must not contain any syntax errors.
CloudFormation validates the template before applying changes.
- B
The stack must be in a steady state with no previous failed updates.
Why wrong: You can update a stack even if the previous update failed, as long as it is in a valid state.
- C
The stack must be in a state that allows updates (e.g., CREATE_COMPLETE, UPDATE_COMPLETE).
CloudFormation cannot update a stack that is in a transient state like UPDATE_IN_PROGRESS.
- D
A change set must be created and executed before the update.
Why wrong: Change sets are optional; you can update directly using the template.
- E
The stack must have no drift detected.
Why wrong: Drift does not prevent updates; you can update a drifted stack.
Question 1,065 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.
Which TWO criteria must be met for an AWS CloudFormation stack update to be successful? (Choose 2.)
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
✓
The update template must be valid and must not contain any syntax errors.
Option A is correct because AWS CloudFormation validates the template syntax and structure before initiating any stack update. If the template contains invalid JSON or YAML, references nonexistent resources, or violates intrinsic function rules, the update request is rejected immediately. This validation ensures that only syntactically correct templates proceed to the update operation.
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.
- ✓
The update template must be valid and must not contain any syntax errors.
Why this is correct
CloudFormation validates the template before applying changes.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The stack must be in a steady state with no previous failed updates.
Why it's wrong here
You can update a stack even if the previous update failed, as long as it is in a valid state.
- ✓
The stack must be in a state that allows updates (e.g., CREATE_COMPLETE, UPDATE_COMPLETE).
Why this is correct
CloudFormation cannot update a stack that is in a transient state like UPDATE_IN_PROGRESS.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A change set must be created and executed before the update.
Why it's wrong here
Change sets are optional; you can update directly using the template.
- ✗
The stack must have no drift detected.
Why it's wrong here
Drift does not prevent updates; you can update a drifted stack.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'stack must be in a steady state' (a common misconception) with the actual requirement that the stack must be in a state that allows updates, such as CREATE_COMPLETE or UPDATE_COMPLETE, not necessarily without any prior failures.
Detailed technical explanation
How to think about this question
Under the hood, CloudFormation performs a dry-run validation of the template against the current stack resources, checking for circular dependencies, missing parameters, and unsupported property changes. A subtle behavior is that even if the template is valid, the update may fail at runtime due to resource constraints or API throttling, which is why CloudFormation supports rollback triggers and stack policies. In real-world scenarios, teams often use change sets to preview changes before execution, but this is not a mandatory step for a successful update.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Visual reference
What to study next
Got this wrong? Here's your next step.
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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: The update template must be valid and must not contain any syntax errors. — Option A is correct because AWS CloudFormation validates the template syntax and structure before initiating any stack update. If the template contains invalid JSON or YAML, references nonexistent resources, or violates intrinsic function rules, the update request is rejected immediately. This validation ensures that only syntactically correct templates proceed to the update operation.
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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