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Exam AZ-303 topic 1 question 41 discussion

Actual exam question from Microsoft's AZ-303
Question #: 41
Topic #: 1
[All AZ-303 Questions]

HOTSPOT -
You create a virtual machine scale set named Scale1. Scale1 is configured as shown in the following exhibit.

Use the drop-down menus to select the answer choice that completes each statement based on the information presented in the graphic.
NOTE: Each correct selection is worth one point.
Hot Area:

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Suggested Answer:
Box 1:
The Autoscale scale out rule increases the number of VMs by 2 if the CPU threshold is 80% or higher. The initial instance count is 4 and rises to 6 when the 2 extra instances of VMs are added.
Box 2:
The Autoscale scale in rule decreases the number of VMs by 4 if the CPU threshold is 30% or lower. The initial instance count is 4 and thus cannot be reduced to
0 as the minimum instances is set to 2. Instances are only added when the CPU threshold reaches 80%.
Reference:
https://docs.microsoft.com/en-us/azure/azure-monitor/platform/autoscale-overview https://docs.microsoft.com/en-us/azure/azure-monitor/platform/autoscale-best-practices https://docs.microsoft.com/en-us/azure/azure-monitor/platform/autoscale-common-scale-patterns
by TSMRE at June 1, 2021, 5:32 a.m.

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ZetaZeti
Highly Voted 4 years, 1 month ago
Correct: 6-2 1) 6 vms. We start with 4 vms and scale out to 6 since with 85% we exceed the 80% threshold. We stay at 6 wms because the new load on the CPUs is 4*85/6=56,66% which is in the middle between 30% and 80% where no action takes place. 2) 2 vms. We start with 4 vms (this is a completely different new case and we mustn't think that we start from where the first point above left) and we scale in to 2 vms (this is a lower bound) since 25% is lower than 30% . We stay at 2 vms because the new load on the CPUs is 25*4/2=50% which is in the midlle between 30% and 80% where no action takes place. Furthermore, they ratify 50% of utilization which is equal to the utilization we have immediately after the scale in.
upvoted 29 times
Cramster
4 years, 1 month ago
6/2, I asked this during a bootcamp and the instructor confirmed the scale set will "try" to reduce by 4 but is restricted by the minimum (2) and will only reduce to 2
upvoted 2 times
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TSMRE
Highly Voted 4 years, 2 months ago
Should be 6 for the first answer and then 4 for the second since we cannot scale below our minimum amount of VMs, which is 2, so it will not be executed
upvoted 8 times
Amit3
4 years, 1 month ago
Why 4 for the second answer ?. At 25%, the VM's has to decrease by 4, if we take assumption that they were 6 from No.1 then they will drop to 2, which is minimum.
upvoted 5 times
pentium75
4 years ago
But the second question is not related to the first. The second scenario is starting with 4 VMs, not with the 6 VMs from question 1. Still, VMs should decrease by 4 which is not possible, so it will probably go to 2.
upvoted 3 times
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nicksu
4 years ago
1. It starts with 4 instances. 2.Utilization is 25%. 3. After 5 minutes evaluation occurs: 25*4 = 100 / 2 = 50 ( 2 here is an evaluated number of nodes after scale down) 50 < 80 - flapping is avoided - scale in occurs 4 - 4 = 0, but minimum allowed are 2 instances
upvoted 6 times
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sandeepmalik
Most Recent 3 years, 4 months ago
In today's exam. Score 900+ Correct answer.
upvoted 2 times
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justfordevelopment
3 years, 4 months ago
In the exam on 12-03-2022. Total 50 questions including case study. "Litware Acquired Fabricam" case study.
upvoted 1 times
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[Removed]
3 years, 5 months ago
correct
upvoted 1 times
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resq4u
3 years, 8 months ago
For second part it'll be 4, as it's clearly mentioned that scaling tried to kick in after deployment, not after first part. So they both should be considered independently.
upvoted 1 times
JayBee65
3 years, 6 months ago
I'm not sure what you are saying is clearly mentioned, but the second part should clearly be 2 for the reasons given repeatedly in the threat. There is no argument to suggest 4 is correct, other than a few people saying 4 is correct without explaination.
upvoted 1 times
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gun1989
3 years, 5 months ago
Its better to not comment if you don't understand the question. its so illogical thing you are saying. its Clearly ans is 6 and 2 here. Minimum no of VM to be maintained is 2, so instead of decreasing to 0 it will reduce to 2.
upvoted 1 times
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edmacoar123
3 years, 8 months ago
On exam today 19/11/21. Correct answer. Score 860.
upvoted 3 times
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Carlo5
3 years, 8 months ago
I think the answer is correct. Autoscale detects flapping but is still able to successfully scale. You will see a log type of FlappingOccurred in this situation. If you see this, the autoscale engine has attempted to scale (e.g. from 4 instances to 2), but has determined that this would cause flapping. Instead, the autoscale engine has scaled to a different number of instances (e.g. using 3 instances instead of 2), which no longer causes flapping, so it has scaled to this number of instances.
upvoted 1 times
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gizda2
3 years, 8 months ago
as others already pointed out, 4 goes for the second question.
upvoted 1 times
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Ahmadtooo
3 years, 8 months ago
Correct Answer: 6,2 based on Scale-out and in configuration.
upvoted 2 times
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BOA02
3 years, 10 months ago
2. The VM can only reduce by 4 when below 30. we cant have o VM so the Aws should be 4
upvoted 2 times
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syu31svc
3 years, 11 months ago
Answer is correct As the CPU threshold increased more than 80%, it will add 2 VM’s to the scale set. The initial count of VM's are 4. So, a total of 6 virtual machines will be running. As the CPU threshold decreased to less than 30 percent, the scale in will reduce the VMs by 4. However, the minimum number of VMs that should be maintained is 2. So, there will be 2 VMs in the scale set.
upvoted 1 times
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MinhajR
3 years, 11 months ago
On Exam 27/08/2021
upvoted 2 times
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GoelS
3 years, 11 months ago
Hi, What is the final answer to this question, there are different views coming from different person...
upvoted 2 times
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Pinto
4 years ago
What is the metric time period duration are we to consider: 5 min or 10 min(Default)? https://www.examtopics.com/discussions/microsoft/view/16477-exam-az-103-topic-3-question-22-discussion/
upvoted 1 times
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AdityaGupta
4 years ago
The answer will be 6 and 2. Our initial count was 4, minimum is 2 and maximum is 20. When we started, the number of VMs in Scale Set will be 4 then due to load conditions specified it has to scale out, it increased by 2 VMs so the count become 6, after sometime due to specified load conditions it has to scale-in by 4, so the count will be 6-4 =2. Hope it clears the doubts.
upvoted 1 times
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az_architect
4 years ago
It should be 6 for scale up and 4 for scale down.
upvoted 2 times
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