Practice Test
True or False? Azure offers high availability for VMs by physically isolating your VM instances onto different hardware in the same datacenter.
- True
- False
Answer: True
Explanation: Azure provides high availability through availability sets by ensuring that your VMs are placed on different physical hardware in the same datacenter to minimize the risk of hardware failure.
What can you use to group VM within a data center to ensure that they are separated across different physical servers, racks, storage units and network switches?
- a) Availability Sets
- b) Availability Zones
- c) Resource Groups
- d) Recovery Services Vault
Answer: a) Availability Sets
Explanation: An availability set is a logical grouping of VMs within a data center that allows Azure to understand how your application is built to provide redundancy and availability.
True or False? Azure Virtual Machines support manual failover only.
- True
- False
Answer: False
Explanation: Azure supports both manual and automatic failover. It uses Azure Site Recovery to automate replication of Azure VMs.
Which of the following can be used to protect your applications from a datacenter failure?
- a) Availability sets
- b) Availability zones
- c) Update domains
- d) Fault domains
Answer: b) Availability zones
Explanation: Availability zones protect applications from datacenter failures. They are unique physical locations within a region, composed of one or more datacenters with independent power, cooling, and networking.
What is the maximum number of fault domains that an availability set can have in Azure?
- a) 1
- b) 2
- c) 3
- d) 5
Answer: c) 3
Explanation: An availability set can have a maximum of 3 fault domains. Each fault domain represents a different physical server rack in the data center, ensuring VM redundancy and availability.
True or False? In an availability set, a planned maintenance event affects all VMs simultaneously.
- True
- False
Answer: False
Explanation: In an availability set, a planned maintenance event affects only one update domain at a time, not all VMs.
What is the purpose of the Proximity Placement Group in Azure?
- a) To ensure that Azure VMs reside in different data centers.
- b) To keep Azure VMs together in the same data center.
- c) To specify the geographical region where Azure VMs should be hosted.
- d) To ensure automatic failover of Azure VMs.
Answer: b) To keep Azure VMs together in the same data center.
Explanation: Proximity Placement Groups are used when you want to keep Azure VMs close together within the same Azure data center to minimize network latency.
True or False? An Azure Scale Set automatically increases or decreases the number of VM instances running based on demand or a defined schedule.
- True
- False
Answer: True
Explanation: Azure VM Scale Sets let you create and manage a group of identical, load-balanced VMs. It can automatically increase or decrease the number of VM instances in response to demand or a defined schedule.
Which feature allows VMs in Azure to reboot without any downtime?
- a) Availability sets
- b) Availability zones
- c) Live Migration
- d) Failover clusters
Answer: c) Live Migration
Explanation: Live Migration is an Azure feature that allows your VM to move to another host in the same datacenter, with no downtime, reactive to host maintenance events or proactively through user-initiated moves.
In Azure, what is the maximum number of Update domains that you can have?
- a) 2
- b) 5
- c) 10
- d) 20
Answer: b) 5
Explanation: In Azure, VMs in an availability set are distributed across up to 5 ‘update domains’. An update domain is a group of VMs and underlying physical hardware that can be rebooted at the same time.
Interview Questions
1. How can you configure availability options for Azure Virtual Machines?
Azure Virtual Machines can be configured for availability by using availability sets or availability zones. Availability sets group virtual machines together to provide redundancy in case of hardware failure.
2. What is an availability set in Azure?
An availability set is a logical grouping capability that you can use in Azure Virtual Machines to ensure that your VM instances are distributed across multiple isolated hardware nodes in a datacenter. This helps avoid single points of failure.
3. What are the benefits of using availability sets in Azure VMs?
By using availability sets, your VMs benefit from automatic platform-managed maintenance events, and you can distribute VM instances across multiple fault domains and update domains to protect against unplanned downtime.
4. How does Azure Availability Zones differ from Availability Sets in terms of providing fault tolerance?
Availability Zones provide higher fault tolerance than Availability Sets. Availability Zones are physically separate data centers within an Azure region, each with its own power, cooling, and networking, whereas Availability Sets distribute VMs across multiple fault domains within a data center.
5. Can you place all VM instances within an availability set in the same fault domain?
No, an availability set ensures that the virtual machines within it are placed across multiple fault domains to protect against single points of failure.
6. How can you configure high availability for a Virtual Machine using Availability Zones?
To configure high availability for a VM using Availability Zones, select the appropriate Availability Zone when creating the VM, ensuring that the VM is placed in an auto-managed zone.
7. What is the purpose of Update Domains in relation to availability in Azure?
Update Domains help ensure that only a subset of VM instances within an availability set are rebooted during planned maintenance, which helps maintain the availability of the overall application.
8. In Azure, how many Update Domains can you have in an Availability Set?
In Azure, you can have up to 20 update domains within an Availability Set.
9. Can you change the fault domain of a VM that is part of an availability set after deployment?
No, the fault domain of a VM cannot be changed after deployment. It is determined when the VM is created and added to the availability set.
10. How can you monitor the health and availability of Virtual Machines within an Availability Set?
You can monitor the health and availability of VM instances within an availability set by using Azure Monitor or Azure Monitor for virtual machines. These tools can provide insights into the performance and availability of your VMs in real-time.
11. What does it mean to have a “99.99% SLA” for virtual machines within Availability Zones?
A 99.99% SLA means that Azure guarantees that the VMs placed in Availability Zones will be available at least 99.99% of the time, ensuring high availability and resilience against failures.
12. How can you ensure that your application achieves high availability even during platform maintenance events in Azure?
By using Availability Sets or Availability Zones, you can ensure that your application achieves high availability even during platform maintenance events. These features help distribute VM instances across fault domains and update domains to minimize downtime.
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