Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A startup is developing a web application that requires a relational database with PostgreSQL compatibility. They want a fully managed service that automatically handles backups, patching, and provides high availability with a 99.99% SLA. Which Azure service should they choose?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Azure Database for PostgreSQL
Azure Database for PostgreSQL (Flexible Server) is a fully managed PostgreSQL service with automatic backups, patching, and zone-redundant high availability offering a 99.99% SLA. It is the ideal choice for a PostgreSQL-compatible relational database.
B
Distractor review
Azure SQL Database
Azure SQL Database is a fully managed SQL Server relational database service, not compatible with PostgreSQL. It does not meet the PostgreSQL compatibility requirement.
C
Distractor review
Azure Database for MySQL
Azure Database for MySQL is a fully managed MySQL service, not compatible with PostgreSQL. The application requires PostgreSQL compatibility.
D
Distractor review
Azure Cosmos DB for PostgreSQL
Azure Cosmos DB for PostgreSQL is a distributed, horizontally scalable PostgreSQL-compatible database. However, it is designed for large-scale workloads and may not offer the simple fully managed experience with 99.99% SLA that the standard Azure Database for PostgreSQL flexible server provides. The question specifies automatic backups, patching, and high availability with 99.99% SLA, which aligns with Azure Database for PostgreSQL.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
Related DP-900 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A data engineer needs to process streaming data from IoT devices and store the results in Azure Data Lake Storage for long-term analytics. The data must be processed in near real-time to detect anomalies and trigger alerts. Which Azure service should the engineer use for stream processing?
Question 2
A data engineer needs to query data stored in CSV files in Azure Data Lake Storage Gen2 using T-SQL in Azure Synapse Analytics, without loading the data into the database. Which feature should they use?
Question 3
A data engineer needs to process raw clickstream data from multiple websites that is stored in Azure Blob Storage as JSON files. The processing must run automatically every hour, transform the data into a structured format for reporting, and handle schema changes in the source data without manual intervention. Which Azure service should be used?
Question 4
A data engineer is designing a data lake architecture in Azure. They plan to first ingest raw data from various sources into a landing zone in Azure Data Lake Storage Gen2. Then they will clean, validate, and deduplicate that data in a second zone. Finally, they will create aggregated, business-ready datasets in a third zone for analysts. This layered approach is known as which architecture?
Question 5
A data engineer needs to transform large datasets stored in Azure Data Lake Storage Gen2 using Python and Apache Spark. They want a serverless compute option that automatically scales and requires no cluster management. Which Azure service should they use?
Question 6
A company collects customer feedback forms. Each form contains always-present fields like CustomerID and SubmissionDate, but also a free-text Comments field and optional fields like Rating or ProductCategory that vary between forms. How should this data be classified?
FAQ
Questions learners often ask
What does this DP-900 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Azure Database for PostgreSQL — Azure Database for PostgreSQL is a fully managed relational database service that offers high availability with zone-redundant deployment, automatic backups, and patching. It provides PostgreSQL compatibility and a 99.99% SLA when deployed with zone redundancy. Azure SQL Database is for SQL Server, not PostgreSQL. Azure Database for MySQL is for MySQL, not PostgreSQL. Azure Cosmos DB for PostgreSQL (formerly Hyperscale) is a distributed PostgreSQL-compatible service but is designed for horizontal scaling and may not offer the same simple fully managed experience with 99.99% SLA as the standard Azure Database for PostgreSQL flexible server.
What should I do if I get this DP-900 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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