- A
Fn::Sub
Sub can substitute ${AWS::StackName} to make a unique name.
- B
Fn::Select
Why wrong: Select returns an element from a list.
- C
AWS::NoValue
Why wrong: NoValue removes a property.
- D
Fn::GetAtt
Why wrong: GetAtt returns an attribute value.
Question 37 of 1,750
Generating Unique Amazon SQS Queue Names with Fn::Sub
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.
A company uses AWS CloudFormation to manage a stack that includes an Amazon SQS queue. The queue name must be unique. The developer wants to define the queue name in the CloudFormation template. Which intrinsic function should be used to generate a unique name?
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
✓
Fn::Sub
A is correct because `Fn::Sub` can embed a pseudo parameter like `AWS::StackName` or `AWS::AccountId` into a string to generate a unique queue name. By using `Fn::Sub` with a reference to the stack name or a random string, you can create a name that avoids collisions across accounts or regions, satisfying the uniqueness requirement for SQS queue names.
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.
- ✓
Fn::Sub
Why this is correct
Sub can substitute ${AWS::StackName} to make a unique name.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Fn::Select
Why it's wrong here
Select returns an element from a list.
- ✗
AWS::NoValue
Why it's wrong here
NoValue removes a property.
- ✗
Fn::GetAtt
Why it's wrong here
GetAtt returns an attribute value.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse `Fn::GetAtt` (which retrieves attributes like ARN or URL) with the ability to generate a unique name, but `Fn::GetAtt` cannot create or modify a name string—it only reads existing resource properties.
Detailed technical explanation
How to think about this question
Under the hood, `Fn::Sub` performs string interpolation, allowing you to combine literal text with template parameters, resource references, and pseudo parameters like `${AWS::StackName}`. For SQS queue names, which must be unique within an AWS region, using `${AWS::StackName}-myqueue` ensures that each stack deployment produces a distinct name. A real-world scenario is when multiple environments (dev, test, prod) are deployed from the same template; `Fn::Sub` with `AWS::StackName` prevents naming collisions without manual intervention.
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.
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: Fn::Sub — A is correct because `Fn::Sub` can embed a pseudo parameter like `AWS::StackName` or `AWS::AccountId` into a string to generate a unique queue name. By using `Fn::Sub` with a reference to the stack name or a random string, you can create a name that avoids collisions across accounts or regions, satisfying the uniqueness requirement for SQS queue names.
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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