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DP-300 Practice Question: Plan and configure a high availability and disaster recovery environment

Your company has a SQL Server on Azure VM running a critical database. The VM is in a single availability set. You need to achieve a Recovery Point Objective (RPO) of 5 minutes and a Recovery Time Objective (RTO) of 15 minutes in case of an Azure region failure. What should you implement?

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

Configure Azure Site Recovery to replicate the VM to a secondary region.

Azure Site Recovery (ASR) can replicate the Azure VM to a secondary region with a replication frequency as low as 5 minutes, meeting the RPO of 5 minutes. Upon failover, the RTO can be less than 15 minutes if the VM is properly configured and failover is regularly tested. Option A (Always On Availability Groups with synchronous commit) can achieve low RPO, but across regions, synchronous commit introduces significant latency and requires at least three replicas (including a witness) for automatic failover, making it complex and potentially unable to meet the RTO consistently. Option C (daily backups) has an RPO of 24 hours, failing the 5-minute requirement. Option D (geo-redundant storage) provides storage-level replication but does not ensure application-consistent recovery or VM compute availability; auto-failover for storage does not fail over the VM itself. Therefore, ASR is the best choice for the specified RPO and RTO in a region failure scenario.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • Configure SQL Server Always On Availability Groups with synchronous commit to a secondary VM in another region.

    Why it's wrong here

    Synchronous commit can affect performance and may not meet RTO for region failure without additional orchestration.

  • Configure Azure Site Recovery to replicate the VM to a secondary region.

    Why this is correct

    Azure Site Recovery provides replication with RPO of seconds to minutes and RTO of minutes.

  • Use Azure Backup with daily backups and geo-restore.

    Why it's wrong here

    Daily backups have RPO of up to 24 hours, not 5 minutes.

  • Store database files on geo-redundant storage (GRS) and enable auto-failover.

    Why it's wrong here

    GRS provides storage-level replication but not application-consistent failover.

Visual reference

Client Server SYN (seq=100) SYN-ACK (seq=200, ack=101) ACK (ack=201) Connection established — data transfer begins

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Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

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