Topic 1 · Question 155

But the solution says you have deployed it in multiple regions hence it can be assumed that the services were available in other regions

Thought the same, but going by the statement "Not all regions offer the same services" B is right

That sounds like a very very broad assumption. The question nowhere states about specific service or resource. Unless they a service is explicitly specified and is unavailble, we at Microsoft always recommend multi-region for geo-redundancy and datacenter disaster recovery to clients. I am reporting that question since i do not agree with the answer.

i think what is required is best possible answer.. regions are NOT primarily designed for fault tolerance.

That sounds like a very very broad assumption. The question nowhere states about specific service or resource. Unless they a service is explicitly specified and is unavailble, we at Microsoft always recommend multi-region for geo-redundancy and datacenter disaster recovery to clients. I am reporting that question since i do not agree with the answer.

If the VM is deployed accross multiple regions it is deployed accross multiple datacenters... So it matchs the goal

We may be overdoing it but regardless it meets the goal. May not be very cost effective or performant but that's not the goal here.

>You plan to deploy several Azure virtual machines.

This is just a simple case for "Deploying Azure virtual machines".
Any region has this fundamental function....So the answer is "Yes".

It matches alright but recommended. Regions do not have the same compliance level when it comes to service.

It matches alright but recommended. Regions do not have the same compliance level when it comes to service.

you add a condition the question doesn't have framed

you add a condition the question doesn't have framed

you add a condition the question doesn't have framed

"You need to ensure that the services running on the virtual machines are available if a single data center fails."

This sentence implies that while you're setting up the service, the regions you have chosen already have the services you need. Regardless if all regions offer the same services, you wouldn't use 2 regions that didn't have all the services available to you, thus making the question irrelevant if that was the case.

For what reason is this solutions supposed not to work ?

"Services running on the virtual machines". Azure is only supporting the VMs. The VMs are running the services, this is not related to any Azure services other than Virtual Machine support.

Azure have paired regions, not all regions can pair to each other.
https://docs.microsoft.com/en-us/azure/best-practices-availability-paired-regions

I also thought this should work

Microsoft's definition of a region "A region is a set of data centres deployed within a latency-defined perimeter and connected through a dedicated regional low-latency network" so the answer if A here, not B.

Microsoft recommended solution is to Use Availability Zones to protect from datacenter failures.
There might be multiple solution, but we need to consider proven, cost effective & recommended only.

Microsoft recommended solution is to Use Availability Zones to protect from datacenter failures.
There might be multiple solution, but we need to consider proven, cost effective & recommended only.

... all of them have VMs

"You need to ensure that the services running on the virtual machines are available" question is about services on VM not on azure, as long as you can run VM in datacenter (in any region) VMs services should start/run together with VM. == answer should be: A (yes)

Deploying the VM in different regions only ensures that one of the VM is available if the other other is down but it does not perform a fail over switching automatically and it has to configured additionally unlike Fault Domains. And here the solution only says deployment to different regions. No extra assumptions.

I think you're overthinking the question. It's simply: we have some services (you don't know which, and where), and if we were to deploy these to another region (again, you don't know where, but assuming that you don't dumbly pick a region where your services are not supported): would we be protected from a single data centre failure? I think the answer then is obviously YES.

"You need to ensure that the services running on the virtual machines are available" question is about services on VM not on azure, as long as you can run VM in datacenter (in any region) VMs services should start/run together with VM. == answer should be: A (yes)

Not all Regions across the World support the same Services.
Have a look at: "Regions that support Availability Zones in Azure"
https://docs.microsoft.com/en-us/azure/availability-zones/az-region

... all of them have VMs

Remember this is a fundamental exam and getting into the nitty gritty of services being regionally available or not is "probably" not being tested. They trying to see if you fundamentally understand high availability. Thats just my opinion though

But the;re just asking if it works or not.

But the;re just asking if it works or not.

But the;re just asking if it works or not.

Answer: Yes

Deploying virtual machines to two or more regions can help to ensure the availability of the services running on the virtual machines if a single data center fails. By deploying virtual machines to multiple regions, you can help to ensure that your services are available even if an entire region experiences a failure. In the event of a failure, the virtual machines in the unaffected regions can continue to run and provide the necessary services.

Availability Zones
and
Regions are both good answers.

Why are we discussing ?
Region : A set of datacenters deployed within a latency-defined perimeter and connected through a dedicated regional low-latency network.
We deploy the VM in two ore more regions.
Does it meet the goal when one DC fails ? YES !
It's OVERKILL BUT YES IT MEETS THE GOAL !

This is asking to see if you understand about virtual machine high availability. This includes Fault tolerance and disaster recovery to help ensure VM availability.

Fault tolerance = "Availability zones" on the data centre level.
Disaster recovery = "Region pairing" on the region level.

Answer is Yes

I think in reality the answer is YES, but the official Microsoft answer is NO because regions are NOT primarily designed for fault tolerance.