The correct answer is to set custom headers in the event subscription's 'Delivery Properties' configuration. This works because Azure Event Grid allows you to define static custom headers directly on the subscription, which are then injected into the HTTPS POST request sent to the third-party endpoint, satisfying the requirement for custom headers without altering the event schema itself. On the AZ-204 exam, this scenario tests your understanding of Event Grid’s delivery customization features, often appearing as a distractor where candidates confuse delivery properties with advanced filters or dead-letter settings—remember, advanced filters control which events are sent, not how they are delivered. A common trap is choosing a solution that modifies the event payload, but custom headers are metadata added at the subscription level. Memory tip: think “Headers on the Hook”—custom headers are set on the subscription hook, not inside the event.
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 are designing a microservices architecture where each service needs to publish events to multiple subscribers. You choose Azure Event Grid. However, one of the subscribers is a third-party service that requires HTTPS endpoint and custom headers in the event delivery. How should you configure Event Grid?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set custom headers in the event subscription's 'Delivery Properties' configuration.
Event Grid supports custom headers in event subscriptions via the 'includedEventTypes' and 'subjectBeginsWith' filters, but for custom headers, you need to use the 'Advanced Filter' or 'Delivery Properties'. Option C is correct because you can set custom headers in the event subscription. Option A is not supported; Option B is for dead-lettering; Option D is for filtering.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use Event Grid's 'Advanced Filters' to add custom headers to events.
Why it's wrong here
Advanced filters are for filtering events, not for adding headers.
✗
Use Event Grid domains to route events to the third-party service.
Why it's wrong here
Domains are for multi-tenant scenarios, not for custom headers.
✓
Set custom headers in the event subscription's 'Delivery Properties' configuration.
Why this is correct
Event Grid allows you to define custom headers that are included in the HTTP POST to the endpoint.
Related concept
Static NAT maps one inside address to one outside address.
✗
Configure a dead-letter destination to handle delivery failures.
Why it's wrong here
Dead-lettering handles failures, not custom headers.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Scenario analysis trap
Domains are for multi-tenant scenarios, not for custom headers.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-204 NAT questions on configuration and troubleshooting.
Connect to and consume Azure services and third-party services — This question tests Connect to and consume Azure services and third-party services — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Set custom headers in the event subscription's 'Delivery Properties' configuration. — Event Grid supports custom headers in event subscriptions via the 'includedEventTypes' and 'subjectBeginsWith' filters, but for custom headers, you need to use the 'Advanced Filter' or 'Delivery Properties'. Option C is correct because you can set custom headers in the event subscription. Option A is not supported; Option B is for dead-lettering; Option D is for filtering.
What should I do if I get this AZ-204 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-204 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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