DP-900 Practice Question: Identify considerations for relational data on Azure
This DP-900 practice question tests your understanding of identify considerations for relational data on azure. 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 corporation needs to deploy a relational database in Azure that supports global distribution and low-latency reads and writes across multiple regions. The data model is primarily key-value with occasional relational queries. Which Azure service should they choose?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Cosmos DB with PostgreSQL-compatible API
Option D is correct because Azure Cosmos DB offers multiple consistency levels and global distribution with multi-region writes, and its API for NoSQL can handle key-value data. However, it also provides a PostgreSQL-compatible API (Citus) for relational scenarios, making it the best fit for global distribution. Option A is wrong because Azure SQL Database's geo-replication supports only one writable region. Option B is wrong because Azure SQL Managed Instance is region-bound. Option C is wrong because Azure Database for PostgreSQL with Hyperscale (Citus) is a good option but does not offer the same multi-region write capabilities as Cosmos DB, and the question emphasizes global distribution.
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.
✗
Azure SQL Database with active geo-replication
Why it's wrong here
Only one writable region; not ideal for multi-region writes.
✗
Azure SQL Managed Instance
Why it's wrong here
Limited to a single region, no global distribution.
✗
Azure Database for PostgreSQL – Hyperscale (Citus)
Why it's wrong here
Distributes data across nodes but is not designed for multi-region writes.
✓
Azure Cosmos DB with PostgreSQL-compatible API
Why this is correct
Supports global distribution, multi-region writes, and relational queries via the PostgreSQL API.
Related concept
Static NAT maps one inside address to one outside address.
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
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-900 question in full detail.
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 DP-900 NAT questions on configuration and troubleshooting.
Identify considerations for relational data on Azure — This question tests Identify considerations for relational data on Azure — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Azure Cosmos DB with PostgreSQL-compatible API — Option D is correct because Azure Cosmos DB offers multiple consistency levels and global distribution with multi-region writes, and its API for NoSQL can handle key-value data. However, it also provides a PostgreSQL-compatible API (Citus) for relational scenarios, making it the best fit for global distribution. Option A is wrong because Azure SQL Database's geo-replication supports only one writable region. Option B is wrong because Azure SQL Managed Instance is region-bound. Option C is wrong because Azure Database for PostgreSQL with Hyperscale (Citus) is a good option but does not offer the same multi-region write capabilities as Cosmos DB, and the question emphasizes global distribution.
What should I do if I get this DP-900 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 DP-900 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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