Quick Answer
The answer is Cosmos DB multi-region writes, which in the context of reducing read latency is often referred to as multi-region reads. This feature allows you to configure your Azure Cosmos DB account to be replicated across multiple Azure regions, enabling the SDK to automatically route read requests to the nearest region based on the client’s location. By serving reads from a local replica, it eliminates the need for a separate global load-balancing service and dramatically lowers latency for distributed users. On the Microsoft Azure Data Fundamentals DP-900 exam, this concept tests your understanding of how Cosmos DB achieves global distribution and low-latency reads, often appearing as a scenario where an e-commerce company needs fast product catalog access worldwide. A common trap is confusing this with read-only replicas or manual failover, but remember that multi-region writes is the single setting that enables both local writes and automatic nearest-region reads. For a memory tip: think “write once, read everywhere” — enabling multi-region writes lets your data be read from the closest region without extra configuration.
This DP-900 practice question tests your understanding of describe core data concepts. 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.
An e-commerce company uses Azure Cosmos DB for its product catalog. They need to ensure that read requests are served from the nearest Azure region to reduce latency. Which feature should they use?
Azure Front Door
Why wrong: Global load balancer for web applications.
Cosmos DB multi-region writes
Allows reads from the nearest region with automatic routing.
Azure Content Delivery Network
Why wrong: Caches static content, not database queries.
Microsoft Traffic Manager
Why wrong: DNS-based traffic routing, not for database reads.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Cosmos DB multi-region writes
Cosmos DB multi-region writes (correctly referred to as multi-region reads in this context) allows you to configure your database account to be read from multiple Azure regions, enabling the SDK to automatically route read requests to the nearest region based on the client's location. This reduces latency by serving reads from a local replica without requiring a separate global load-balancing service.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Azure Front Door
Why it's wrong here
Global load balancer for web applications.
Cosmos DB multi-region writes
Why this is correct
Allows reads from the nearest region with automatic routing.
Related concept
Read the scenario before looking for a memorised answer.
Azure Content Delivery Network
Why it's wrong here
Caches static content, not database queries.
Microsoft Traffic Manager
Why it's wrong here
DNS-based traffic routing, not for database reads.
Common exam traps
The trap here is that candidates often confuse Azure Front Door or Traffic Manager as the solution for global read routing, but Cosmos DB's native multi-region read capability is the correct answer because it operates at the database SDK level with automatic region awareness and consistency support.
Detailed technical explanation
Cosmos DB multi-region reads leverage the SDK's built-in 'preferred locations' list, which the client uses to select the nearest available region based on latency probes. Under the hood, the SDK maintains a regional endpoint mapping and automatically fails over to the next closest region if the primary read region becomes unavailable, all while preserving consistency guarantees like session or eventual consistency. In a real-world scenario, a user in Europe would have their read requests served from a Cosmos DB replica in West Europe, while a user in Asia would be served from Southeast Asia, without any manual routing or additional infrastructure.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
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FAQ
Describe core data concepts — This question tests Describe core data concepts — Read the scenario before looking for a memorised answer..
The correct answer is: Cosmos DB multi-region writes — Cosmos DB multi-region writes (correctly referred to as multi-region reads in this context) allows you to configure your database account to be read from multiple Azure regions, enabling the SDK to automatically route read requests to the nearest region based on the client's location. This reduces latency by serving reads from a local replica without requiring a separate global load-balancing service.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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