Quick Answer
The answer is synchronous replication, as it is the only mode that guarantees zero data loss for Azure SQL Managed Instance failover groups. Synchronous replication works by committing each transaction on both the primary and secondary replicas before acknowledging the write, ensuring that no committed data is lost even if the primary region fails catastrophically. On the DP-300 exam, this concept tests your understanding that failover groups with automatic failover and zero data loss requirements mandate synchronous replication, regardless of geographic distance—even 500 miles away—though latency will increase. A common trap is assuming asynchronous replication can achieve zero data loss, but it only minimizes data loss, not eliminates it. Remember the mnemonic: “Sync for zero, Async for near.”
This DP-300 practice question tests your understanding of plan and implement data platform resources. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 company is deploying Azure SQL Managed Instance and needs to ensure that the failover group provides automatic failover with zero data loss during a regional outage. The secondary region is 500 miles away. Which data replication mode should be configured?
Synchronous replication
Synchronous replication ensures zero data loss.
Geo-replication
Why wrong: Geo-replication is not a replication mode; it's a feature.
Snapshot replication
Why wrong: Snapshot replication is not supported in failover groups.
Asynchronous replication
Why wrong: Asynchronous replication may cause data loss during failover.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Synchronous replication
Azure SQL Managed Instance failover groups require synchronous replication to guarantee zero data loss during automatic failover. Synchronous replication ensures that transactions are committed on both the primary and secondary replicas before acknowledging the commit, so no data is lost even if the primary region fails. This mode is mandatory for failover groups with the 'automatic failover' and 'zero data loss' requirements, despite the 500-mile distance which introduces latency.
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.
Synchronous replication
Why this is correct
Synchronous replication ensures zero data loss.
Related concept
Read the scenario before looking for a memorised answer.
Geo-replication
Why it's wrong here
Geo-replication is not a replication mode; it's a feature.
Snapshot replication
Why it's wrong here
Snapshot replication is not supported in failover groups.
Asynchronous replication
Why it's wrong here
Asynchronous replication may cause data loss during failover.
Common exam traps
The trap here is that candidates often assume asynchronous replication is acceptable for disaster recovery, but the question explicitly requires 'zero data loss,' which only synchronous replication can guarantee in a failover group context.
Detailed technical explanation
Synchronous replication in Azure SQL Managed Instance failover groups uses the Always On Availability Groups technology with a quorum-based commit protocol. The secondary replica must acknowledge each transaction commit before the primary confirms it to the client, which introduces network round-trip latency proportional to distance (e.g., ~8 ms for 500 miles at speed of light). In practice, this can increase transaction latency, so it is typically used only for critical databases where zero data loss is non-negotiable, and the application must tolerate higher write latency.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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FAQ
Plan and implement data platform resources — This question tests Plan and implement data platform resources — Read the scenario before looking for a memorised answer..
The correct answer is: Synchronous replication — Azure SQL Managed Instance failover groups require synchronous replication to guarantee zero data loss during automatic failover. Synchronous replication ensures that transactions are committed on both the primary and secondary replicas before acknowledging the commit, so no data is lost even if the primary region fails. This mode is mandatory for failover groups with the 'automatic failover' and 'zero data loss' requirements, despite the 500-mile distance which introduces latency.
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 11, 2026
This DP-300 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 DP-300 exam.
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