The answer is to deploy the application to multiple Azure App Service instances across different regions and place them behind Azure Front Door. This approach is correct because Azure Front Door provides global HTTP load balancing with automatic failover, continuously monitoring the health of each regional backend and instantly rerouting user traffic away from any failed region to the nearest healthy one, ensuring seamless cross-region high availability. On the AZ-305 exam, this scenario tests your understanding of designing resilient application architectures, often contrasting Front Door with Traffic Manager—a common trap is choosing Traffic Manager, but Front Door is superior for App Service as it operates at the application layer, supports session affinity, and integrates with Web Application Firewall. Remember the memory tip: "Front Door for apps, Traffic Manager for DNS"—if your workload is HTTP-based and needs fast failover, Front Door is the correct choice.
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.
A company runs a critical web application on Azure App Service in a single region. They need to achieve high availability across regions with automatic failover in the event of a regional outage. Which approach should they recommend?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy to multiple regions with Azure Front Door
Azure Front Door provides global load balancing and automatic failover across multiple regions by routing traffic to the nearest healthy backend. For a critical web application requiring cross-region high availability, deploying App Service instances in multiple regions behind Front Door ensures seamless failover during a regional outage, as Front Door monitors endpoint health and redirects traffic away from failed regions.
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 multiple App Service instances in the same region with Traffic Manager
Why it's wrong here
Incorrect. This provides redundancy within a single region but does not protect against a regional outage.
✓
Deploy to multiple regions with Azure Front Door
Why this is correct
Correct. Azure Front Door can route traffic across regions and automatically fail over to a healthy region if the primary goes down.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use App Service auto-scaling rules to handle increased load
Why it's wrong here
Incorrect. Auto-scaling adjusts capacity within a region, it does not provide cross-region failover.
✗
Enable Azure Site Recovery for the App Service
Why it's wrong here
Incorrect. Azure Site Recovery is designed for virtual machines, not for Azure App Service workloads.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Traffic Manager (DNS-level, no health probe for App Service) with Azure Front Door (application-layer, with health probes and instant failover), leading them to choose Option A for cross-region scenarios.
Detailed technical explanation
How to think about this question
Azure Front Door uses Anycast protocol and a global edge network to route traffic to the closest healthy origin, with health probes sent every 5 seconds by default (configurable). Under the hood, it supports both active-active and active-passive failover patterns, and can be combined with Azure Traffic Manager for additional routing policies, but Front Door is the recommended service for HTTP/HTTPS applications needing cross-region failover and SSL offload.
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 to multiple regions with Azure Front Door — Azure Front Door provides global load balancing and automatic failover across multiple regions by routing traffic to the nearest healthy backend. For a critical web application requiring cross-region high availability, deploying App Service instances in multiple regions behind Front Door ensures seamless failover during a regional outage, as Front Door monitors endpoint health and redirects traffic away from failed regions.
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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