The answer is to deploy the application to multiple regions and use Traffic Manager, while also enabling ARR Affinity (client affinity) on the Azure App Service. This combination works because ARR Affinity ensures that all requests from a single client session are routed to the same instance, preserving in-memory session state for stateful ASP.NET apps, while multi-region deployment with Traffic Manager provides geographic load balancing and failover for high availability. On the AZ-204 exam, this scenario tests your understanding of how to maintain session state across scaled-out or multi-region architectures, often appearing as a trap where candidates mistakenly choose only scaling up or using Redis Cache instead of the simpler ARR Affinity fix. A key memory tip is to think of ARR Affinity as a "session sticky note" that keeps a user glued to the same server instance, preventing state loss when load balancing across multiple instances.
AZ-204 Develop Azure compute solutions Practice Question
This AZ-204 practice question tests your understanding of develop azure compute 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 high availability for a stateful ASP.NET application deployed on Azure App Service?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable ARR Affinity (client affinity) to maintain session state.
Option A is correct because enabling ARR Affinity (client affinity) ensures that all requests from a given client session are routed to the same instance, preserving in-memory session state. Without this, a stateful ASP.NET application would lose session data if subsequent requests are load-balanced to different instances, causing session state errors.
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.
✓
Enable ARR Affinity (client affinity) to maintain session state.
Why this is correct
ARR affinity ensures requests from same client go to same instance.
Related concept
Read the scenario before looking for a memorised answer.
✗
Scale up the App Service plan to a higher tier.
Why it's wrong here
Scaling up increases resources, not availability.
✓
Deploy the application to multiple regions and use Traffic Manager.
Why this is correct
Multi-region deployment with Traffic Manager provides failover.
Related concept
Read the scenario before looking for a memorised answer.
✗
Store session state in Azure Files share.
Why it's wrong here
Not a recommended HA strategy for session state.
✗
Disable session state to allow any instance to handle requests.
Why it's wrong here
Disabling session state may break stateful apps.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse scaling up (Option B) with high availability, not realizing that scaling up only adds resources to a single instance, whereas high availability requires redundancy across instances or regions.
Detailed technical explanation
How to think about this question
ARR Affinity uses a cookie (ARRAffinity) set by the Azure App Service front-end load balancer to pin a client to a specific instance. For true high availability with stateful apps, you must externalize session state using a centralized store like Azure Cache for Redis (which supports session state provider) or Azure SQL Database, combined with multi-region deployment and Traffic Manager for failover.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable ARR Affinity (client affinity) to maintain session state. — Option A is correct because enabling ARR Affinity (client affinity) ensures that all requests from a given client session are routed to the same instance, preserving in-memory session state. Without this, a stateful ASP.NET application would lose session data if subsequent requests are load-balanced to different instances, causing session state errors.
What should I do if I get this AZ-204 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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