AZ-300 Azure High Availability & Disaster Recovery 2 — Questions and Answers
Question 1: Which Azure SQL Database feature enables automatic failover to a secondary database in a different region with minimal data loss?
- Active geo-replication (Correct answer)
- Read replicas
- Elastic pools
- Transparent data encryption
Correct answer: Active geo-replication
Active geo-replication continuously replicates an Azure SQL Database to up to four readable secondary databases in different regions, and supports manual or automatic failover.
Question 2: What is the maximum number of fault domains supported by an Azure Availability Set?
- 2
- 3 (Correct answer)
- 5
- 10
Correct answer: 3
Azure Availability Sets support up to 3 fault domains, which correspond to separate physical racks with independent power and network within a datacenter.
Question 3: A web application must remain available even if an entire Azure datacenter fails. Which redundancy option should be used?
- Deploy VMs in the same Availability Set
- Deploy VMs across Availability Zones in the same region (Correct answer)
- Use Azure Backup with geo-redundant storage
- Deploy VMs in a single large VM SKU for vertical scaling
Correct answer: Deploy VMs across Availability Zones in the same region
Availability Zones are physically separate datacenters within a region, so deploying VMs across multiple zones ensures availability even if one entire datacenter fails.
Question 4: Which Azure Cosmos DB feature provides automatic failover to a secondary region with zero data loss?
- Multi-master writes with strong consistency
- Single-region writes with geo-redundancy enabled
- Multi-region writes (multi-master) configuration (Correct answer)
- Read replicas in a secondary region
Correct answer: Multi-region writes (multi-master) configuration
Multi-region writes (multi-master) in Azure Cosmos DB allow writes to any region, and with bounded staleness or strong consistency, automatic failover occurs with no data loss.
Question 5: What type of Azure Site Recovery failover should you use to test your DR plan without impacting production workloads?
- Planned failover
- Unplanned failover
- Test failover (Correct answer)
- Partial failover
Correct answer: Test failover
Test failover in Azure Site Recovery spins up replicated VMs in an isolated network, allowing validation of the DR plan without affecting production or causing replication to pause.
Question 6: An organization requires RPO of 15 minutes for an Azure SQL Database. Which replication feature meets this requirement?
- Manual database backups every 15 minutes
- Auto-failover groups with asynchronous replication
- Active geo-replication with continuous asynchronous replication (Correct answer)
- Point-in-time restore from automated backups
Correct answer: Active geo-replication with continuous asynchronous replication
Active geo-replication uses continuous asynchronous replication and typically achieves RPO well under 5 seconds in practice, easily meeting a 15-minute RPO requirement.
Question 7: Which Azure load balancing service operates at Layer 7 (HTTP/HTTPS) and provides global distribution of web traffic with SSL offloading?
- Azure Load Balancer
- Azure Traffic Manager
- Azure Application Gateway
- Azure Front Door (Correct answer)
Correct answer: Azure Front Door
Azure Front Door operates at Layer 7 globally, providing HTTP/HTTPS load balancing, SSL offloading, WAF, and Anycast routing to the closest healthy backend across regions.
AZ-300 Azure High Availability & Disaster Recovery 2
Which Azure SQL Database feature enables automatic failover to a secondary database in a different region with minimal data loss?