The answer is Azure Event Grid because it is a push-based event broker that triggers Azure Functions with sub-second latency, directly addressing the need to minimize cold starts in real-time IoT data processing. Unlike pull-based triggers such as Event Hubs, which require polling and can introduce delays, Event Grid delivers events instantly from IoT Hub to Functions, ensuring the pipeline scales automatically without idle time. On the Microsoft Azure Solutions Architect Expert AZ-305 exam, this scenario tests your understanding of event-driven architecture patterns and the trade-offs between ingestion services—a common trap is choosing Event Hubs for its high throughput, but the question specifically prioritizes low latency and cold start mitigation. Remember: for real-time, push-based triggers that keep Functions warm, Event Grid is the grid that sparks instantly.
AZ-305 Design infrastructure solutions Practice Question
This AZ-305 practice question tests your understanding of design infrastructure solutions. 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 is designing a serverless architecture for a real-time data processing pipeline. The pipeline ingests data from IoT devices, processes the data using Azure Functions, and stores the results in Azure Cosmos DB. The solution must scale automatically and minimize cold starts. Which Azure service should the company use to trigger the Azure Functions?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Event Grid
Option A (Azure Event Grid) is a push-based event broker that can trigger Functions with low latency, minimizing cold starts. Option B (Azure Event Hubs) is for high-throughput data ingestion; Functions can be triggered from Event Hubs but cold starts can be higher. Option C (Azure Service Bus) is for messaging, not real-time IoT ingestion. Option D (Azure Queue Storage) is for simple queuing, not ideal for real-time. The best answer is Event Grid because it directly triggers Functions with events from IoT devices (via IoT Hub).
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 clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Queue Storage
Why it's wrong here
Queue Storage is for asynchronous message processing, not real-time triggers.
✗
Azure Event Hubs
Why it's wrong here
Event Hubs is optimized for high-throughput ingestion; Functions can be triggered but cold starts may be higher.
✗
Azure Service Bus
Why it's wrong here
Service Bus is for enterprise messaging, not designed for real-time IoT data ingestion.
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 infrastructure solutions — This question tests Design infrastructure solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Event Grid — Option A (Azure Event Grid) is a push-based event broker that can trigger Functions with low latency, minimizing cold starts. Option B (Azure Event Hubs) is for high-throughput data ingestion; Functions can be triggered from Event Hubs but cold starts can be higher. Option C (Azure Service Bus) is for messaging, not real-time IoT ingestion. Option D (Azure Queue Storage) is for simple queuing, not ideal for real-time. The best answer is Event Grid because it directly triggers Functions with events from IoT devices (via IoT Hub).
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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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