The answer is that the parameter was overridden by a previous stack operation or a different parameter file. This is the most likely cause because the error message shows the value 't2.nano' was passed, yet the command itself correctly specifies 't2.micro'—meaning the template’s allowed values are not the problem, but rather an external source injected the invalid value. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of how CloudFormation parameter validation errors can arise from parameter precedence, where CLI arguments, parameter files, or stack policies can silently override values. A common trap is assuming a typo in the command, but the real issue is that a prior stack update or a separate parameter file supplied the conflicting value. Memory tip: when the error value doesn’t match your command, think “override, not typo”—check your parameter files and stack policies first.
SAP-C02 Practice Question: Accelerate Workload Migration and Modernization
This SAP-C02 practice question tests your understanding of accelerate workload migration and modernization. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Network Topology
A CloudFormation stack creation command is run with a parameter. The template.yaml includes a parameter declared as follows:
Parameters:
InstanceTypeParameter:
Type: String
Default: t2.micro
AllowedValues:
- t2.micro
- t2.small
- t2.medium
The stack creation fails with the error: "Value (t2.nano) for parameter InstanceTypeParameter is invalid. Must be one of: t2.micro, t2.small, t2.medium". What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The parameter was overridden by a previous stack operation or a different parameter file
The error indicates that the value passed is 't2.nano', but the command shows 't2.micro'. This suggests that the parameter value was overridden elsewhere, perhaps in a different command or a previous stack operation. The command itself is correct. The template defines allowed values. The issue is not a typo in the command, but an override. The most likely cause is that the parameter was passed incorrectly in a prior run or the CLI used a different value.
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 AWS CLI is using a deprecated version
Why it's wrong here
CLI version does not affect parameter validation.
✗
The template.yaml file was modified after the command was run
Why it's wrong here
The error reflects the allowed values, so the template is correct.
✓
The parameter was overridden by a previous stack operation or a different parameter file
Why this is correct
The error shows 't2.nano', which must have come from an override.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The CLI command had a typo in the parameter value
Why it's wrong here
The command shows 't2.micro' which is valid.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
The command shows 't2.micro' which is valid.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
What to study next
Got this wrong? Here's your next step.
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Accelerate Workload Migration and Modernization — This question tests Accelerate Workload Migration and Modernization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The parameter was overridden by a previous stack operation or a different parameter file — The error indicates that the value passed is 't2.nano', but the command shows 't2.micro'. This suggests that the parameter value was overridden elsewhere, perhaps in a different command or a previous stack operation. The command itself is correct. The template defines allowed values. The issue is not a typo in the command, but an override. The most likely cause is that the parameter was passed incorrectly in a prior run or the CLI used a different value.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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