Quick Answer
The answer is Azure Relay, which is the correct choice because it enables hybrid event bridging from on-premises without requiring the on-premises system to initiate outbound HTTPS calls. Azure Relay works by establishing a secure, bidirectional connection over port 443, allowing on-premises services to listen for and relay events to Azure Event Grid through a cloud-based relay endpoint, effectively solving the outbound connectivity limitation. On the Microsoft Azure Developer Associate AZ-204 exam, this scenario tests your understanding of hybrid connectivity patterns, often appearing as a distractor where candidates mistakenly choose VPN Gateway or ExpressRoute—both of which require network-level changes and outbound initiation. A common trap is assuming Event Grid can accept inbound connections, but it cannot; Azure Relay acts as the bridge. Memory tip: think of Azure Relay as a "telephone operator" that connects a call from on-premises to Azure without the on-premises side dialing out.
This AZ-204 practice question tests your understanding of connect to and consume azure services and third-party services. 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.
You are designing a solution that needs to relay events from an on-premises system to Azure Event Grid. The on-premises system cannot make outbound HTTPS calls. Which Azure service should you use as a bridge?
Azure VPN Gateway
Why wrong: VPN Gateway provides site-to-site VPN but requires network configuration.
Azure Relay
Azure Relay allows on-premises services to expose endpoints to Azure without opening inbound ports.
Azure ExpressRoute
Why wrong: ExpressRoute is a dedicated private connection, overkill for event relay.
Azure Event Grid on-premises
Why wrong: Event Grid is a cloud service; there is no on-premises version.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Azure Relay
Azure Relay enables hybrid connections by allowing on-premises services to connect to Azure via outbound port 443. Option A is wrong because VPN Gateway requires network changes. Option B is wrong because ExpressRoute is a dedicated connection. Option C is wrong because Event Grid does not support inbound connections from on-premises.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Azure VPN Gateway
Azure Relay
Why this is correct
Azure Relay allows on-premises services to expose endpoints to Azure without opening inbound ports.
Related concept
Read the scenario before looking for a memorised answer.
Azure ExpressRoute
Why it's wrong here
ExpressRoute is a dedicated private connection, overkill for event relay.
Azure Event Grid on-premises
Why it's wrong here
Event Grid is a cloud service; there is no on-premises version.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Identify which AZ-204 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.
Connect to and consume Azure services and third-party services — study guide chapter
Learn the concepts, then practise the questions
Connect to and consume Azure services and third-party services practice questions
Targeted practice on this topic area only
All AZ-204 questions
997 questions across all exam domains
Microsoft Azure Developer Associate AZ-204 study guide
Full concept coverage aligned to exam objectives
AZ-204 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise AZ-204 questions linked to Develop Azure compute solutions.
Practise AZ-204 questions linked to Develop for Azure storage.
Practise AZ-204 questions linked to Implement Azure security.
Practise AZ-204 questions linked to Connect to and consume Azure services and third-party services.
Practise AZ-204 questions linked to Monitor, troubleshoot, and optimize Azure solutions.
Practise AZ-204 questions linked to AZ-204 fundamentals.
Practise AZ-204 questions linked to AZ-204 scenario.
Practise AZ-204 questions linked to AZ-204 troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
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..
The correct answer is: Azure Relay — Azure Relay enables hybrid connections by allowing on-premises services to connect to Azure via outbound port 443. Option A is wrong because VPN Gateway requires network changes. Option B is wrong because ExpressRoute is a dedicated connection. Option C is wrong because Event Grid does not support inbound connections from on-premises.
Identify which AZ-204 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.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 20, 2026
This AZ-204 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-204 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.