The correct answer is to deploy the application to at least two Azure regions and use Azure Front Door with health probes and origin failover. This design satisfies the business requirement for automatic failover and global HTTP acceleration because Azure Front Door continuously monitors endpoint health via probes, instantly routing traffic away from a failed region to a healthy one, while its anycast network provides low-latency HTTP acceleration worldwide. On the AZ-305 exam, this scenario tests your understanding of global load balancing patterns versus regional services like Traffic Manager, which lacks native HTTP acceleration. A common trap is choosing Azure Traffic Manager alone, but remember that Front Door is the only service combining Layer 7 acceleration with automatic region failover. Memory tip: think “Front Door for fast failover” — it’s the single service that handles both performance and disaster recovery for web apps.
AZ-305 Design business continuity solutions Practice Question
This AZ-305 practice question tests your understanding of design business continuity solutions. 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.
A mission-critical web application must tolerate a full Azure region outage. The business requires automatic failover and global HTTP acceleration. Which two components should be included in the design? (Choose 2.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy the application to at least two Azure regions.
Option A is correct because deploying the application to at least two Azure regions provides geographic redundancy, ensuring that if one entire region fails, the application can still operate from the other region. This is a fundamental requirement for tolerating a full region outage. Option B is correct because Azure Front Door provides global HTTP acceleration and automatic failover by using health probes to monitor endpoint health and routing traffic to healthy origins, which meets the business requirements for both automatic failover and performance.
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.
✓
Deploy the application to at least two Azure regions.
Why this is correct
A single-region deployment cannot survive a full regional outage.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use Azure Front Door with health probes and origin failover.
Why this is correct
Front Door can route users to a healthy regional origin automatically.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use only availability zones in one region.
Why it's wrong here
Availability zones protect against datacenter failure, not full regional outage.
✗
Use Azure Bastion for failover routing.
Why it's wrong here
Bastion provides secure administrative access, not application failover.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse availability zones (which protect against datacenter failures within a region) with multi-region deployments (which are required for region outage tolerance), leading them to incorrectly select Option C as sufficient.
Detailed technical explanation
How to think about this question
Azure Front Door uses anycast-based routing and a global edge network to accelerate HTTP traffic, and its health probes (configurable with HTTP/HTTPS endpoints, intervals, and failure thresholds) enable automatic failover to a secondary origin when the primary region is unhealthy. Under the hood, Front Door monitors the health of each backend pool and, upon detecting consecutive probe failures, immediately reroutes traffic to the next healthy region, typically within seconds. This design is critical for mission-critical workloads where recovery time objective (RTO) must be near zero.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-305 question in full detail.
Design business continuity solutions — This question tests Design business continuity solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy the application to at least two Azure regions. — Option A is correct because deploying the application to at least two Azure regions provides geographic redundancy, ensuring that if one entire region fails, the application can still operate from the other region. This is a fundamental requirement for tolerating a full region outage. Option B is correct because Azure Front Door provides global HTTP acceleration and automatic failover by using health probes to monitor endpoint health and routing traffic to healthy origins, which meets the business requirements for both automatic failover and performance.
What should I do if I get this AZ-305 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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