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 business-critical App Service application must survive a full regional outage. The recovery design should fail over automatically based on endpoint health and avoid DNS-cache delay where possible. Which service should front the regional deployments?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Front Door
Azure Front Door is the correct choice because it provides global HTTP/HTTPS load balancing with automatic failover across regions based on real-time endpoint health probes. It uses Anycast routing to direct traffic to the nearest healthy region, which avoids DNS-cache delay inherent in DNS-based solutions like Traffic Manager. This ensures sub-second failover and meets the requirement for a business-critical app that must survive a full regional outage.
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.
✗
Azure Load Balancer
Why it's wrong here
Azure Load Balancer is regional and does not provide global web failover.
✗
Azure Application Security Groups
Why it's wrong here
ASGs group NICs for NSG rules and do not provide failover.
✓
Azure Front Door
Why this is correct
Azure Front Door provides global HTTP/S load balancing, health probes, and fast failover at the edge.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Traffic Manager only
Why it's wrong here
Traffic Manager is DNS-based and can be affected by client DNS caching.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Azure Traffic Manager's DNS-based global routing with Azure Front Door's Anycast-based global routing, overlooking the critical DNS-cache delay that Traffic Manager introduces.
Detailed technical explanation
How to think about this question
Azure Front Door uses Anycast for its front-end IP addresses, meaning traffic is routed to the nearest Point of Presence (PoP) via BGP, and then internally forwarded to the selected backend region based on health and latency. Its health probes are configurable at intervals as low as 5 seconds, enabling rapid detection of regional failures. In contrast, Traffic Manager uses DNS TTLs (default 300 seconds) that clients cache, so even if the DNS record is updated immediately, clients may not query the new IP for minutes.
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
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.
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: Azure Front Door — Azure Front Door is the correct choice because it provides global HTTP/HTTPS load balancing with automatic failover across regions based on real-time endpoint health probes. It uses Anycast routing to direct traffic to the nearest healthy region, which avoids DNS-cache delay inherent in DNS-based solutions like Traffic Manager. This ensures sub-second failover and meets the requirement for a business-critical app that must survive a full regional outage.
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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