AZ-204 Practice Question: Connect to and consume Azure services and third-party services
This AZ-204 practice question tests your understanding of connect to and consume azure services and third-party services. 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.
You manage an API in Azure API Management. The API response varies depending on the caller's subscription key. You need to cache responses per subscription key to reduce backend load. Which policy configuration should you use?
Correct. Using a policy like <cache-lookup vary-by-key="@(context.Subscription.Id)" /> caches different responses per subscription.
B
Use a global cache with no variation
Why wrong: Incorrect. Global caching would return the same cached response to all callers regardless of subscription key, which is incorrect when responses differ.
C
Disable caching and rely on the backend
Why wrong: Incorrect. This does not reduce backend load, which is the goal.
D
Use rate limiting policy
Why wrong: Incorrect. Rate limiting controls request rate, not caching of responses.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set cache key to include the subscription key
Option A is correct because Azure API Management's caching policy allows you to customize the cache key using the `@(context.Subscription.Id)` expression. By setting the cache key to include the subscription key, each caller's responses are cached separately based on their unique subscription, ensuring that variations in the API response per subscription key are preserved while reducing backend load.
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.
✓
Set cache key to include the subscription key
Why this is correct
Correct. Using a policy like <cache-lookup vary-by-key="@(context.Subscription.Id)" /> caches different responses per subscription.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a global cache with no variation
Why it's wrong here
Incorrect. Global caching would return the same cached response to all callers regardless of subscription key, which is incorrect when responses differ.
✗
Disable caching and rely on the backend
Why it's wrong here
Incorrect. This does not reduce backend load, which is the goal.
✗
Use rate limiting policy
Why it's wrong here
Incorrect. Rate limiting controls request rate, not caching of responses.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates might confuse caching policies with rate limiting or assume that a single global cache is sufficient, overlooking the need to differentiate cache entries per caller identity when the API response varies by subscription key.
Detailed technical explanation
How to think about this question
Under the hood, Azure API Management's caching policy uses a cache key that is a string derived from the request context, including HTTP method, URL, and optionally custom expressions like `@(context.Subscription.Id)`. The cache is stored in a distributed Redis cache (if configured) or in-memory, and the key must be unique per variation to avoid cache collisions. In a real-world scenario, if an API returns different data for different subscription tiers (e.g., free vs. premium), failing to include the subscription key in the cache key would cause a premium user to see cached data intended for a free user, leading to data leakage and incorrect behavior.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Connect to and consume Azure services and third-party services — This question tests Connect to and consume Azure services and third-party services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set cache key to include the subscription key — Option A is correct because Azure API Management's caching policy allows you to customize the cache key using the `@(context.Subscription.Id)` expression. By setting the cache key to include the subscription key, each caller's responses are cached separately based on their unique subscription, ensuring that variations in the API response per subscription key are preserved while reducing backend load.
What should I do if I get this AZ-204 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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Question Discussion
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