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Exam AZ-900 topic 1 question 116 discussion

Actual exam question from Microsoft's AZ-900

Question #: 116
Topic #: 1

HOTSPOT -
You plan to deploy a critical line-of-business application to Azure.
The application will run on an Azure virtual machine.
You need to recommend a deployment solution for the application. The solution must provide a guaranteed availability of 99.99 percent.
What is the minimum number of virtual machines and the minimum number of availability zones you should recommend for the deployment? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Hot Area:

Show Suggested Answer

Suggested Answer:

You need a minimum of two virtual machines with each one located in a different availability zone.
Availability Zones is a high-availability offering that protects your applications and data from datacenter failures. Availability Zones are unique physical locations within an Azure region. Each zone is made up of one or more datacenters equipped with independent power, cooling, and networking. To ensure resiliency, there's a minimum of three separate zones in all enabled regions. The physical separation of Availability Zones within a region protects applications and data from datacenter failures. Zone-redundant services replicate your applications and data across Availability Zones to protect from single-points-of-failure. With Availability
Zones, Azure offers industry best 99.99% VM uptime SLA.
References:
https://docs.microsoft.com/en-us/azure/availability-zones/az-overview

by rgalfaro at Dec. 3, 2019, 5:16 p.m.

Comments

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sbettani

Highly Voted 4 years, 7 months ago

"For all Virtual Machines that have two or more instances deployed across two or more Availability Zones in the same Azure region, we guarantee you will have Virtual Machine Connectivity to at least one instance at least 99.99% of the time." https://azure.microsoft.com/en-us/support/legal/sla/virtual-machines/v1_8/

upvoted 145 times

411

4 years, 1 month ago

2 VM in each AZ. Does that mean there will be 4 VMs at any given moment? Will that be failOVer only or sharing load also? Some cloud company recommend 3 and 3.

upvoted 6 times

Pass4IT

2 years, 4 months ago

Minimally, 1 VM in each AZ so in total 2 VM and 2 AZ. Refer to this YouTube tutorial: https://www.youtube.com/watch?v=5NMcM4zJPM4 Go to 9:37 , there is a diagram that shows how 99.99% is achieved.

upvoted 7 times

SAFM

9 months, 3 weeks ago

Very helpful, thank you!

upvoted 1 times

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m1nt1w0p4cc

3 years ago

This is not any mom and pop cloud provider corporation... this is MS

upvoted 11 times

SyedAadRazaDevops

2 years, 11 months ago

hahahhahahahahhah

upvoted 2 times

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Kei_zzZ

2 years, 4 months ago

It's said 2 VMs with each one located in different availability zone

upvoted 1 times

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CarlosM

Highly Voted 4 years, 4 months ago

For all Virtual Machines that have two or more instances deployed across two or more Availability Zones in the same Azure region, we guarantee you will have Virtual Machine Connectivity to at least one instance at least 99.99% of the time. For all Virtual Machines that have two or more instances deployed in the same Availability Set, we guarantee you will have Virtual Machine Connectivity to at least one instance at least 99.95% of the time. For any Single Instance Virtual Machine using premium storage for all Operating System Disks and Data Disks, we guarantee you will have Virtual Machine Connectivity of at least 99.9%

upvoted 43 times

semauni

1 year, 1 month ago

https://www.azure.cn/en-us/support/sla/virtual-machines/

upvoted 2 times

semauni

1 year, 1 month ago

Woops I saw the .cn after I responded... (thanks Google for putting this as a first hit). Still, this is a comprehensive overview which should be the same for Azure in general.

upvoted 1 times

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Molota

Most Recent 1 year, 1 month ago

2 VM and 2 AZ

upvoted 3 times

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Pa1theAchiever

2 years ago

correct

upvoted 1 times

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raul4real73

2 years, 1 month ago

https://docs.microsoft.com/en-us/learn/modules/choose-azure-services-sla-lifecycle/4-design-application-meet-sla == "Deploying two or more instances of an Azure virtual machine across two or more availability zones raises the virtual machine SLA to 99.99 percent"

upvoted 1 times

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JKRowlings

2 years, 2 months ago

For all Virtual Machines that have two or more instances deployed across two or more Availability Zones in the same Azure region, we guarantee you will have Virtual Machine Connectivity to at least one instance at least 99.99% of the time. https://azure.microsoft.com/en-us/support/legal/sla/virtual-machines/v1_9/

upvoted 1 times

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CodePro

2 years, 3 months ago

For all Virtual Machines that have two or more instances deployed across two or more Availability Zones in the same Azure region, we guarantee you will have Virtual Machine Connectivity to at least one instance at least 99.99% of the time. https://azure.microsoft.com/en-us/support/legal/sla/virtual-machines/v1_9/

upvoted 1 times

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namtn6

2 years, 4 months ago

i moved to azure from aws. In aws need minimum 1 instance to ensure always HA to cost-efficient

upvoted 1 times

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techgirl77

2 years, 6 months ago

Took the exam 12/30/21. This was the only resource I used to study. Thank you examtopics and all of you guys for your comments. Make sure to go through all the questions twice and you will pass. Good luck everyone!

upvoted 4 times

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