- A
Deploy the application in two EU regions with Azure Front Door and Azure SQL Database geo-replication.
Why wrong: Azure Front Door does not enforce data residency; Azure SQL geo-replication may have cross-region data movement.
- B
Deploy the application in a single Azure region in Ireland with Azure Site Recovery for DR.
Why wrong: Single region does not meet DR across regions requirement.
- C
Deploy the application in two EU regions with Azure Traffic Manager and Azure Cosmos DB multi-region writes.
Traffic Manager routes users to nearest region, Cosmos DB multi-region writes enable low latency and data residency within EU.
- D
Deploy the application in a single EU region with Azure Site Recovery and Azure Redis Cache.
Why wrong: Site Recovery is for DR but does not minimize latency for active traffic.
Quick Answer
The correct answer is to deploy the application in two EU regions with Azure Traffic Manager and Azure Cosmos DB multi-region writes. This active-active architecture satisfies GDPR data residency by keeping all data within EU boundaries while using Cosmos DB’s multi-region writes to provide low-latency reads and writes for European users, and Traffic Manager routes traffic to the nearest healthy region for built-in disaster recovery. On the AZ-305 exam, this scenario tests your ability to balance compliance, performance, and resilience—a common trap is choosing Azure Front Door, which excels at global load balancing but lacks the regional data residency enforcement required by GDPR. Remember that for strict data sovereignty, you must pair a regional traffic routing service like Traffic Manager with a database that supports multi-region writes, such as Cosmos DB. A useful memory tip: “Two regions, two writes, Traffic in sight” helps you recall the core components for a compliant, low-latency multi-region architecture.
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.
A multinational company plans to deploy a new application on Azure. The application must comply with GDPR and requires data residency in the EU. The solution should minimize latency for users in Europe and provide disaster recovery across regions. Which Azure architecture should the company implement?
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
Deploy the application in two EU regions with Azure Traffic Manager and Azure Cosmos DB multi-region writes.
Option C is correct because an active-active multi-region deployment with Azure Traffic Manager and Cosmos DB provides low latency and data residency control. Option A is wrong because a single-region deployment does not provide disaster recovery across regions. Option B is wrong because Azure Front Door is for global load balancing but does not enforce data residency. Option D is wrong because Azure Site Recovery provides DR but does not minimize latency for active traffic.
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 the application in two EU regions with Azure Front Door and Azure SQL Database geo-replication.
Why it's wrong here
Azure Front Door does not enforce data residency; Azure SQL geo-replication may have cross-region data movement.
- ✗
Deploy the application in a single Azure region in Ireland with Azure Site Recovery for DR.
Why it's wrong here
Single region does not meet DR across regions requirement.
- ✓
Deploy the application in two EU regions with Azure Traffic Manager and Azure Cosmos DB multi-region writes.
Why this is correct
Traffic Manager routes users to nearest region, Cosmos DB multi-region writes enable low latency and data residency within EU.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Deploy the application in a single EU region with Azure Site Recovery and Azure Redis Cache.
Why it's wrong here
Site Recovery is for DR but does not minimize latency for active traffic.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
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Design infrastructure solutions — study guide chapter
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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 — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Deploy the application in two EU regions with Azure Traffic Manager and Azure Cosmos DB multi-region writes. — Option C is correct because an active-active multi-region deployment with Azure Traffic Manager and Cosmos DB provides low latency and data residency control. Option A is wrong because a single-region deployment does not provide disaster recovery across regions. Option B is wrong because Azure Front Door is for global load balancing but does not enforce data residency. Option D is wrong because Azure Site Recovery provides DR but does not minimize latency for active traffic.
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.
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?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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