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    PracticeAzure Solutions Architect Expert (AZ-305)Azure Solutions Architect Expert AZ-305 Practice Exam 3Question 36
    Medium1 markMultiple Choice
    Domain 3.2: High AvailabilityDomain 3High AvailabilityAvailability ZonesSLA

    AZ-305 · Question 36 · Domain 3.2: High Availability

    You are designing the compute architecture for a new application using Azure Virtual Machines.

    The business requires a 99.99% Service Level Agreement (SLA) for VM uptime.

    Which TWO architectural patterns can you use to achieve this SLA? (Select TWO)

    Answer options:

    A.

    Deploy two or more VMs in an Availability Set.

    B.

    Deploy two or more VMs across different Availability Zones in the same region.

    C.

    Deploy a single VM using Premium SSD managed disks.

    D.

    Deploy VMs using Virtual Machine Scale Sets configured with flexible orchestration across Availability Zones.

    E.

    Deploy two VMs in the same Availability Zone and place an Azure Standard Load Balancer in front of them.

    How to approach this question

    Memorize Azure VM SLAs: Single VM (Premium SSD) = 99.9%. Availability Set = 99.95%. Availability Zones = 99.99%.

    Full Answer

    Microsoft guarantees different SLAs based on the deployment model. A single VM with Premium SSDs gets 99.9%. Two or more VMs in an Availability Set (different racks in the same datacenter) get 99.95%. To achieve a 99.99% SLA, you must deploy two or more VMs across Availability Zones (different physical datacenters within a region). This can be done manually or by using Virtual Machine Scale Sets configured for zone redundancy.

    Common mistakes

    Thinking Availability Sets provide 99.99%. They only provide 99.95%.
    Question 35All questionsQuestion 37

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