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Azure High Availability & Disaster Recovery Flashcards

7 cards from real AZ-300 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which Azure SQL Database feature enables automatic failover to a secondary database in a different region with minimal data loss?

    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.

  2. What is the maximum number of fault domains supported by an Azure Availability Set?

    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.

  3. A web application must remain available even if an entire Azure datacenter fails. Which redundancy option should be used?

    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.

  4. Which Azure Cosmos DB feature provides automatic failover to a secondary region with zero data loss?

    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.

  5. What type of Azure Site Recovery failover should you use to test your DR plan without impacting production workloads?

    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.

  6. An organization requires RPO of 15 minutes for an Azure SQL Database. Which replication feature meets this requirement?

    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.

  7. Which Azure load balancing service operates at Layer 7 (HTTP/HTTPS) and provides global distribution of web traffic with SSL offloading?

    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.