- A
Replace Azure App Service with Azure Virtual Machine Scale Sets
Why wrong: VM Scale Sets increase operational overhead due to OS patching, configuration management, and scaling complexity.
- B
Replace Azure Front Door with Azure Traffic Manager
Why wrong: Traffic Manager lacks WAF capabilities and is DNS-based, increasing complexity for security and load balancing.
- C
Replace Azure Functions with Azure Kubernetes Service (AKS)
AKS provides a container orchestration platform for stateless APIs with better control and scaling, and is more aligned with minimizing operational overhead for a microservices architecture compared to Functions, which is better for event-driven workloads.
- D
Replace Azure SQL Database with Azure SQL Managed Instance
Why wrong: Azure SQL Database already provides high availability and active geo-replication with minimal overhead; Managed Instance would increase operational overhead.
Quick Answer
The answer is to replace Azure Functions with Azure App Service API apps or Azure Kubernetes Service (AKS) to minimize operational overhead. While Azure Functions can handle stateless scaling based on request count, it introduces unnecessary complexity for a traditional API layer that typically requires consistent runtime behavior, middleware integration, and simpler lifecycle management—all of which Azure App Service provides out of the box with less operational burden. On the AZ-305 exam, this scenario tests your ability to match workload characteristics to the right Azure compute service, emphasizing that “minimize operational overhead” often points away from serverless options when the workload is a standard, long-running API rather than event-driven micro-tasks. A common trap is assuming Functions always wins for stateless scaling, but the exam expects you to recognize that App Service offers autoscaling, built-in CI/CD, and lower management overhead for typical multi-tier apps. Memory tip: For a stateless API layer in a multi-tier migration, think “App Service for APIs, Functions for events”—if it’s a request-response pattern, keep it simple with App Service.
AZ-305 Design infrastructure solutions Practice Question
This AZ-305 practice question tests your understanding of design infrastructure 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.
Your company, Contoso Ltd., is migrating its on-premises e-commerce application to Azure. The application consists of a web frontend, an API layer, and a SQL Server database. The migration must meet the following requirements: - The web frontend must automatically scale out based on CPU utilization. - The API layer must be stateless and scale out based on request count. - The database must be a managed service with high availability and disaster recovery across Azure regions. - All components must be secured using Azure Firewall and Web Application Firewall (WAF). - The solution must minimize operational overhead.
You propose the following architecture: - Azure App Service for the web frontend with autoscaling rules based on CPU. - Azure Functions for the API layer (stateless, scaling based on request count). - Azure SQL Database with active geo-replication for the database. - Azure Front Door with WAF policies for global load balancing and security. - Azure Firewall to control outbound traffic.
Which component of this design should be reconsidered to better meet the requirement to minimize operational overhead?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Replace Azure Functions with Azure Kubernetes Service (AKS)
Azure Functions is not ideal for a stateful API layer; Azure App Service (Web Apps) or Azure Kubernetes Service (AKS) would be better. However, the question says the API layer is stateless, so Azure Functions could work. But for a typical API layer, Azure App Service is more appropriate and easier to manage. The correct answer is to replace Azure Functions with Azure App Service API apps or AKS. The distractors include other services that are not optimal.
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.
- ✗
Replace Azure App Service with Azure Virtual Machine Scale Sets
Why it's wrong here
VM Scale Sets increase operational overhead due to OS patching, configuration management, and scaling complexity.
- ✗
Replace Azure Front Door with Azure Traffic Manager
Why it's wrong here
Traffic Manager lacks WAF capabilities and is DNS-based, increasing complexity for security and load balancing.
- ✓
Replace Azure Functions with Azure Kubernetes Service (AKS)
Why this is correct
AKS provides a container orchestration platform for stateless APIs with better control and scaling, and is more aligned with minimizing operational overhead for a microservices architecture compared to Functions, which is better for event-driven workloads.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Replace Azure SQL Database with Azure SQL Managed Instance
Why it's wrong here
Azure SQL Database already provides high availability and active geo-replication with minimal overhead; Managed Instance would increase operational overhead.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
What to study next
Got this wrong? Here's your next step.
Identify which AZ-305 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
- →
Design infrastructure solutions — study guide chapter
Learn the concepts, then practise the questions
- →
Design infrastructure solutions practice questions
Targeted practice on this topic area only
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Microsoft Azure Solutions Architect Expert AZ-305 study guide
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FAQ
Questions learners often ask
What does this AZ-305 question test?
Design infrastructure solutions — This question tests Design infrastructure solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Replace Azure Functions with Azure Kubernetes Service (AKS) — Azure Functions is not ideal for a stateful API layer; Azure App Service (Web Apps) or Azure Kubernetes Service (AKS) would be better. However, the question says the API layer is stateless, so Azure Functions could work. But for a typical API layer, Azure App Service is more appropriate and easier to manage. The correct answer is to replace Azure Functions with Azure App Service API apps or AKS. The distractors include other services that are not optimal.
What should I do if I get this AZ-305 question wrong?
Identify which AZ-305 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 21, 2026
This AZ-305 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-305 exam.
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