- A
Deploy AKS in three regions with Azure Traffic Manager. Use Azure Cosmos DB with multi-region writes. Use Azure Event Hubs with geo-disaster recovery. Use Azure Cache for Redis Enterprise with active geo-replication.
Why wrong: Azure Traffic Manager may take up to 30 seconds to failover due to DNS propagation, exceeding the 10-second RTO.
- B
Deploy AKS in two regions with Azure Front Door. Use Azure Cosmos DB with single write region and auto-failover. Use Azure Service Bus with geo-disaster recovery. Use Azure Cache for Redis Enterprise with active geo-replication.
Why wrong: Single write region for Cosmos DB cannot achieve RPO=0 during failover; Service Bus geo-disaster recovery is active-passive.
- C
Deploy AKS in three regions with Azure Front Door. Use Azure Cosmos DB with multi-region writes. Use Azure Event Hubs with geo-disaster recovery and active-active pattern. Use Azure Cache for Redis Enterprise with active geo-replication.
Azure Front Door provides sub-second failover; all other services support active-active with zero data loss.
- D
Deploy AKS in two regions with Azure Front Door. Use Azure SQL Database with auto-failover groups. Use Azure Event Hubs with geo-disaster recovery. Use Azure Cache for Redis Enterprise with active geo-replication.
Why wrong: Azure SQL Database auto-failover groups are active-passive, leading to potential data loss; Event Hubs geo-disaster recovery is active-passive.
Quick Answer
The correct choice is to deploy AKS in three regions with Azure Front Door, Azure Cosmos DB with multi-region writes, Azure Event Hubs with geo-disaster recovery and active-active pattern, and Azure Cache for Redis Enterprise with active geo-replication. This design meets the strict RTO of 10 seconds and RPO of 0 because every component supports true active-active disaster recovery for AKS with Cosmos DB: Azure Front Door provides instant global load balancing without DNS propagation delays, Cosmos DB multi-region writes eliminate data loss, Event Hubs geo-disaster recovery enables automatic failover for event ingestion, and Redis Enterprise active geo-replication keeps cache consistent across regions. On the AZ-305 exam, this scenario tests your ability to select services that natively support multi-region writes and sub-minute failover, often using a real-time analytics context to trap candidates into choosing DNS-based solutions like Traffic Manager or single-region databases. Remember the key: for zero RPO, every tier must be active-active—if any component is passive, you lose data. Memory tip: "Three A's for zero RPO—Active, All regions, Always writable."
AZ-305 Design business continuity solutions Practice Question
This AZ-305 practice question tests your understanding of design business continuity solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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, Fabrikam Inc., operates a global Software-as-a-Service (SaaS) application that provides real-time analytics. The application runs on Azure Kubernetes Service (AKS) with a microservices architecture. The data tier uses Azure Cosmos DB (Core SQL API) with multi-region writes. The application also uses Azure Event Hubs for event ingestion. The business requires a Recovery Time Objective (RTO) of 10 seconds and a Recovery Point Objective (RPO) of 0 for the entire platform. The solution must support active-active configuration across multiple Azure regions. You have been asked to recommend the disaster recovery design. Which option should you recommend?
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
Deploy AKS in three regions with Azure Front Door. Use Azure Cosmos DB with multi-region writes. Use Azure Event Hubs with geo-disaster recovery and active-active pattern. Use Azure Cache for Redis Enterprise with active geo-replication.
Option B is correct because all components support multi-region writes and active-active configuration: Azure Front Door for global load balancing, Cosmos DB multi-region writes for zero data loss, Event Hubs geo-disaster recovery for automatic failover, and Redis Enterprise active geo-replication. Option A is wrong because Azure Traffic Manager is DNS-based and slower. Option C is wrong because Azure Service Bus does not support multi-region active-active natively. Option D is wrong because Azure SQL Database does not support multi-region writes.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 AKS in three regions with Azure Traffic Manager. Use Azure Cosmos DB with multi-region writes. Use Azure Event Hubs with geo-disaster recovery. Use Azure Cache for Redis Enterprise with active geo-replication.
Why it's wrong here
Azure Traffic Manager may take up to 30 seconds to failover due to DNS propagation, exceeding the 10-second RTO.
- ✗
Deploy AKS in two regions with Azure Front Door. Use Azure Cosmos DB with single write region and auto-failover. Use Azure Service Bus with geo-disaster recovery. Use Azure Cache for Redis Enterprise with active geo-replication.
Why it's wrong here
Single write region for Cosmos DB cannot achieve RPO=0 during failover; Service Bus geo-disaster recovery is active-passive.
- ✓
Deploy AKS in three regions with Azure Front Door. Use Azure Cosmos DB with multi-region writes. Use Azure Event Hubs with geo-disaster recovery and active-active pattern. Use Azure Cache for Redis Enterprise with active geo-replication.
Why this is correct
Azure Front Door provides sub-second failover; all other services support active-active with zero data loss.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Deploy AKS in two regions with Azure Front Door. Use Azure SQL Database with auto-failover groups. Use Azure Event Hubs with geo-disaster recovery. Use Azure Cache for Redis Enterprise with active geo-replication.
Why it's wrong here
Azure SQL Database auto-failover groups are active-passive, leading to potential data loss; Event Hubs geo-disaster recovery is active-passive.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-305 NAT questions on configuration and troubleshooting.
- →
Design business continuity solutions — study guide chapter
Learn the concepts, then practise the questions
- →
Design business continuity solutions practice questions
Targeted practice on this topic area only
- →
All AZ-305 questions
999 questions across all exam domains
- →
Microsoft Azure Solutions Architect Expert AZ-305 study guide
Full concept coverage aligned to exam objectives
- →
AZ-305 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related AZ-305 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Design identity, governance, and monitoring solutions practice questions
Practise AZ-305 questions linked to Design identity, governance, and monitoring solutions.
Design data storage solutions practice questions
Practise AZ-305 questions linked to Design data storage solutions.
Design business continuity solutions practice questions
Practise AZ-305 questions linked to Design business continuity solutions.
Design infrastructure solutions practice questions
Practise AZ-305 questions linked to Design infrastructure solutions.
SAA-C03 VPC practice questions
Practise AZ-305 questions linked to SAA-C03 VPC.
SAA-C03 S3 lifecycle policy questions
Practise AZ-305 questions linked to SAA-C03 S3 lifecycle policy questions.
SAA-C03 RDS Multi-AZ questions
Practise AZ-305 questions linked to SAA-C03 RDS Multi-AZ questions.
SAA-C03 IAM policy practice questions
Practise AZ-305 questions linked to SAA-C03 IAM policy.
SAA-C03 Route 53 failover questions
Practise AZ-305 questions linked to SAA-C03 Route 53 failover questions.
SAA-C03 CloudFront practice questions
Practise AZ-305 questions linked to SAA-C03 CloudFront.
SAA-C03 NAT gateway questions
Practise AZ-305 questions linked to SAA-C03 NAT gateway questions.
SAA-C03 VPC endpoint questions
Practise AZ-305 questions linked to SAA-C03 VPC endpoint questions.
Practice this exam
Start a free AZ-305 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this AZ-305 question test?
Design business continuity solutions — This question tests Design business continuity solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Deploy AKS in three regions with Azure Front Door. Use Azure Cosmos DB with multi-region writes. Use Azure Event Hubs with geo-disaster recovery and active-active pattern. Use Azure Cache for Redis Enterprise with active geo-replication. — Option B is correct because all components support multi-region writes and active-active configuration: Azure Front Door for global load balancing, Cosmos DB multi-region writes for zero data loss, Event Hubs geo-disaster recovery for automatic failover, and Redis Enterprise active geo-replication. Option A is wrong because Azure Traffic Manager is DNS-based and slower. Option C is wrong because Azure Service Bus does not support multi-region active-active natively. Option D is wrong because Azure SQL Database does not support multi-region writes.
What should I do if I get this AZ-305 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-305 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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 →
Same concept, more angles
1 more ways this is tested on AZ-305
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. You are designing a business continuity solution for a global e-commerce platform that runs on Azure Kubernetes Service (AKS) in multiple regions. The application must remain available even if an entire Azure region fails. The application uses Azure Cosmos DB for its database. You need to ensure that the application can continue to serve traffic with minimal disruption. What should you recommend?
hard- A.Use Cosmos DB with geo-redundant storage and deploy a single AKS cluster with Azure Site Recovery.
- B.Deploy AKS clusters in two regions with Azure Traffic Manager and use Cosmos DB single-region writes with async replication.
- ✓ C.Configure Cosmos DB with multi-region writes and deploy AKS clusters in two regions behind Azure Front Door.
- D.Deploy the application to a single region and use Azure Backup for Cosmos DB to restore in another region.
Why C: Option B (multi-region write Cosmos DB with multi-region AKS) provides active-active architecture with automatic failover. Option A (single-region with backups) has high RTO. Option C (geo-redundant storage) is for data only. Option D (Traffic Manager with passive) has lower availability.
Last reviewed: Jun 20, 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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.