The correct choice is to deploy the database in the Business Critical tier with zone-redundant configuration within the West US region. This meets the stringent RPO of 5 seconds and RTO of 30 seconds because the Business Critical tier uses synchronous replication of data across three availability zones, guaranteeing zero data loss and automatic failover in seconds during a zone-level failure, which effectively protects against a regional outage scenario. On the DP-300 exam, this question tests your understanding of Azure SQL Database high-availability architecture and the critical distinction between zone redundancy (intra-region) and geo-replication (cross-region); a common trap is confusing zone redundancy with geo-redundant backups, which cannot meet a 5-second RPO due to asynchronous replication. Remember the memory tip: "Zone sync for zero loss, geo async for disaster."
DP-300 Practice Question: Plan and configure high availability and disaster recovery
This DP-300 practice question tests your understanding of plan and configure high availability and disaster recovery. 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 runs a critical Azure SQL Database in the West US region. To meet a Recovery Point Objective (RPO) of 5 seconds and a Recovery Time Objective (RTO) of 30 seconds during a regional outage, which deployment option should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy the database in the Business Critical tier with zone-redundant configuration in West US
The Business Critical tier with zone-redundant configuration provides synchronous replication of data across three availability zones within the same Azure region, ensuring zero data loss (RPO=0) and automatic failover within seconds. This meets the stringent RPO of 5 seconds and RTO of 30 seconds during a regional outage because zone redundancy protects against zone-level failures, and the failover is automatic and fast. In contrast, other options either introduce asynchronous replication (which cannot guarantee an RPO of 5 seconds) or rely on cross-region failover that exceeds the required RTO.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use an Auto-Failover Group with a secondary in West US 2
Why it's wrong here
Auto-failover groups have RTO of about 1 hour.
✓
Deploy the database in the Business Critical tier with zone-redundant configuration in West US
Why this is correct
Zone-redundant Business Critical provides fast failover within seconds and RPO of 5 seconds.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable geo-zone-redundant backup storage and perform point-in-time restore
Why it's wrong here
Restore from backup takes hours, not seconds.
✗
Configure Active Geo-Replication with a readable secondary in East US
Why it's wrong here
Geo-replication has RTO of minutes, not seconds.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume cross-region replication (Auto-Failover Groups or Active Geo-Replication) is required for regional outages, but the question specifies a regional outage within the same region (West US), where zone-redundant configuration within the same region can meet the aggressive RPO and RTO, whereas cross-region options introduce asynchronous replication and longer failover times.
Detailed technical explanation
How to think about this question
Under the hood, the Business Critical tier with zone redundancy leverages Always On Availability Groups with synchronous commit across three replicas in different availability zones, ensuring that a transaction is committed only when hardened on all replicas. This provides an effective RPO of 0, and the automatic failover is triggered by a lease-based mechanism that detects zone-level failures within seconds. In a real-world scenario, if a datacenter in one zone experiences a power outage, the zone-redundant configuration automatically promotes a replica in another zone without any data loss, while cross-region options would require manual or scripted failover and incur replication lag.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-300 question in full detail.
Plan and configure high availability and disaster recovery — This question tests Plan and configure high availability and disaster recovery — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy the database in the Business Critical tier with zone-redundant configuration in West US — The Business Critical tier with zone-redundant configuration provides synchronous replication of data across three availability zones within the same Azure region, ensuring zero data loss (RPO=0) and automatic failover within seconds. This meets the stringent RPO of 5 seconds and RTO of 30 seconds during a regional outage because zone redundancy protects against zone-level failures, and the failover is automatic and fast. In contrast, other options either introduce asynchronous replication (which cannot guarantee an RPO of 5 seconds) or rely on cross-region failover that exceeds the required RTO.
What should I do if I get this DP-300 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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