The answer is that the parent web app resource is not defined in the template. This error occurs because the ARM template backup configuration for the web app is declared as a child resource of Microsoft.Web/sites, but the parent web app itself is missing from the template’s resources array. In ARM templates, a child resource must either be nested directly within its parent’s properties or the parent must be deployed in the same template; without the parent, the deployment engine cannot resolve the hierarchy, triggering the “cannot be nested under a parent resource that is not deployed” failure. On the AZ-305 exam, this scenario tests your understanding of resource dependency and nesting rules in ARM templates, a common trap where candidates assume an existing resource can be referenced without being declared. The backup schedule and storage account URL are irrelevant to this specific error. Memory tip: “No parent, no child—always declare the tree before the branch.”
AZ-305 Design business continuity solutions Practice Question
This AZ-305 practice question tests your understanding of design business continuity solutions. 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.
Refer to the exhibit. You are deploying an ARM template to configure backup for an Azure Web App. The deployment fails with an error: 'The resource 'Microsoft.Web/sites/config' cannot be nested under a parent resource that is not deployed.' 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 parent web app resource is not defined in the template
Option D is correct because the backup configuration resource is defined as a child resource of the web app, but the parent web app ('Microsoft.Web/sites') is not included in the template. In ARM templates, child resources must be nested under their parent or the parent must be deployed in the same template. Since the web app is not defined, the deployment fails. Option A is wrong because the backup schedule is valid. Option B is wrong because the storage account URL is obtained using reference(), which works if the storage account is deployed or exists. Option C is wrong because the apiVersion is correct for the resource type.
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 parent web app resource is not defined in the template
Why this is correct
The backup config resource requires the parent web app to be present in the template.
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 storageAccountUrl property uses a reference() that cannot be resolved
Why it's wrong here
The reference() function works as long as the storage account exists or is deployed in the same template.
✗
The apiVersion '2022-03-01' is not supported for this resource type
Why it's wrong here
This apiVersion is supported for Microsoft.Web/sites/config.
✗
The backup schedule frequency interval is invalid
Why it's wrong here
The frequency interval of 1 day 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.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-305 question in full detail.
Identify which AZ-305 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.
Design business continuity solutions — This question tests Design business continuity solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The parent web app resource is not defined in the template — Option D is correct because the backup configuration resource is defined as a child resource of the web app, but the parent web app ('Microsoft.Web/sites') is not included in the template. In ARM templates, child resources must be nested under their parent or the parent must be deployed in the same template. Since the web app is not defined, the deployment fails. Option A is wrong because the backup schedule is valid. Option B is wrong because the storage account URL is obtained using reference(), which works if the storage account is deployed or exists. Option C is wrong because the apiVersion is correct for the resource type.
What should I do if I get this AZ-305 question wrong?
Identify which AZ-305 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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