The correct actions are enabling geo-replication on the Service Bus namespace and implementing the event sourcing pattern to ensure business continuity. Geo-replication provides synchronous or asynchronous data replication across paired regions, so if a regional outage occurs, messages are not lost and processing can failover seamlessly. The event sourcing pattern complements this by persisting every state change as an immutable event, allowing the Azure Functions app to replay messages from the queue in the correct order after a disruption. On the AZ-305 exam, this scenario tests your ability to design resilient messaging solutions that meet high-availability and disaster recovery requirements, often appearing as a multi-select question where you must distinguish between active-active replication and simple backup strategies. A common trap is choosing a single-region deployment or a backup-only approach, which fails to guarantee continuity during a regional failure. Remember the mnemonic “GRES” – Geo-Replication and Event Sourcing – to recall the pair that keeps your messages safe and replayable.
AZ-305 Design business continuity solutions Practice Question
This AZ-305 practice question tests your understanding of design business continuity 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.
Which TWO actions should you take to ensure business continuity for an Azure Functions app that processes messages from an Azure Service Bus queue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement the event source pattern to replay messages in case of failure.
Option A (geo-replication) and Option C (event source pattern) ensure messages are not lost and can be replayed. Option B (single region) not resilient. Option D (backup) not needed. Option E (single namespace) not resilient.
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.
✓
Implement the event source pattern to replay messages in case of failure.
Why this is correct
Event source allows reprocessing of messages.
Related concept
Static NAT maps one inside address to one outside address.
✓
Enable geo-replication on the Service Bus namespace.
Why this is correct
Geo-replication provides automatic failover to secondary region.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use a single Service Bus namespace to simplify management.
Why it's wrong here
Single namespace is a single point of failure.
✗
Deploy the Functions app in a single region.
Why it's wrong here
Single region is not resilient to region failure.
✗
Configure Azure Backup for the Functions app.
Why it's wrong here
Backup is not suitable for event-driven processing.
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.
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-305 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-305 NAT questions on configuration and troubleshooting.
Design business continuity solutions — This question tests Design business continuity solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Implement the event source pattern to replay messages in case of failure. — Option A (geo-replication) and Option C (event source pattern) ensure messages are not lost and can be replayed. Option B (single region) not resilient. Option D (backup) not needed. Option E (single namespace) not resilient.
What should I do if I get this AZ-305 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-305 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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