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Exam AZ-104 topic 4 question 65 discussion

Actual exam question from Microsoft's AZ-104

Question #: 65
Topic #: 4

HOTSPOT -
You have an Azure subscription.
You deploy a virtual machine scale set that is configured as shown in the following exhibit.

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

Show Suggested Answer

Suggested Answer:

Reference:
https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-autoscale-portal

by olsenOnS at Dec. 10, 2021, 11:38 a.m.

Comments

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shravan101

Highly Voted 3 years, 6 months ago

box-1 : 3 box-2: 1

upvoted 59 times

mufflon

3 years, 5 months ago

why is it 1 on the second question, it decreases by 1 when CPU utilization goes below 25%, but there is no rule for when to count down again and so on ? it only exist for the scale out rule.

upvoted 10 times

Hyrydar

2 years, 9 months ago

I agree with you because it did not say when the duration for countdown starts..and by the way, the question states there are 5 instances to start with. We must not assume what these questions are asking of us. go with the strict and stated meaning of the question. i say 3 for box1 and 4 for box2. please somebody correct if a am wrong.

upvoted 9 times

Hyrydar

2 years, 9 months ago

Mufflon, you did not say what your answer is.

upvoted 2 times

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buzzerboy

2 years, 5 months ago

wouldnt it scale in every 10 minutes and decrease count by 1 unit. From 10am to 11am there are 6 x 10 min slots. Each time it scales in, it will bring the count down by 1 until it reaches minimum which is 1?

upvoted 4 times

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xRiot007

2 years ago

The scale in rule applies each 10 minutes. it decreases VM count by 1, meaning -6 in 60 minutes. We can't have -1 VMs and we can't have 0 either, because the minimum is 1.

upvoted 8 times

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Mohd1899

2 years, 4 months ago

There must be duration otherwise it will not scale in properly , example , if it does not consider the duration for scale in , it will never go less than 4 vms that's why I agree Box 2 should be 2 we should consider scale out duration for scale in too

upvoted 1 times

Mohd1899

2 years, 4 months ago

sorry my typo mistake Box2 should be 1 scale in (-1) vm every 10 minutes.

upvoted 2 times

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JayLearn2022

Highly Voted 2 years, 4 months ago

Box-1 : 3 Initial starts 2 VM's 15 minutes have passed. at 10 minutes 1 VM was added we now have 3 VM's. Cool down is 5 Minutes before another 10 minute wait cycle starts so the answer is 3. Box-2: 1 Initial 5 VM's 60 minutes Pass. 1 VM removed every 15 minute cycle. 10 minutes wait timer plus 5 minute cool down equals 15 minutes cycle. Four 15 minute cycles pass equaling 60 minutes removing 4 VM's. We have 1 VM left. Default Scale in and Out Default Durations are 10 minutes with 5 minute cool down. The default scale set settings in Azure are: -Minimum number of instances 1 -Maximum number of instances 10 -Scale out CPU threshold (%) 75 -Duration in minutes10 -Number of instances to increase by 1 -Scale in CPU threshold (%) 25 -Number of instances to decrease by -1 https://learn.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-autoscale-portal#create-a-rule-to-automatically-scale-in

upvoted 47 times

sardonique

1 year, 9 months ago

unfortunately these questions are poorly formulated. Why do you assume that at the 9:00 the count is 2? there is no mention about the cpu usage before 9:00, and moreover this is a custom policy, how do you know that the cooldown time is 5 minutes (i know that it's the default time). I hate the lack of context in these questions

upvoted 3 times

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MiniLa92

11 months ago

I believe you are wrong while explaining the duration and cool down. The cool down period only temporarily pauses scaling in/out operations but under the hood the time and metrics are being analyzed. For example if the first scale in happens at 10:10(because of duration of 10 min), then after 5 min cooldown at 10:15 again there will be another scale in(considering the metrics between 10:05 and 10:15) and then another at 10:20(considering metrics between 10:10 and 10:20) and so on. Please read this blog https://cloudbuild.co.uk/azure-virtual-machine-scale-set-duration-and-cool-down-explained/ Correct me if I am worng.

upvoted 3 times

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kcanwi

2 years, 3 months ago

"1 VM removed every 15 minute cycle" May I know how you got the value 15 mins?

upvoted 1 times

mlooney

2 years, 2 months ago

"Default Scale in and Out Default Durations are 10 minutes with 5 minute cool down. "

upvoted 3 times

Slimus

2 years ago

I don't see 5 min cool down value anywhere. Is it a default value?

upvoted 3 times

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RajeshwaranM

Most Recent 5 months, 1 week ago

Why there is no cool down time mentioned in this question ?

upvoted 1 times

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5db86ee

7 months, 2 weeks ago

wrong Box 1: 4 Box 2: 1 Box 1: - 9:00 AM initial starts 2 VMs - 9:10 AM +1VM = 3 VM - 9:15 AM +1VM (default 5 minute cool down) = 4 VM

upvoted 8 times

chrillelundmark

5 months, 2 weeks ago

I really hope people understand that this is the correct answer and not 3. And just to clearify... After the cooldown, there is another check based on the last 10 minutes. If the cpu has been above the threshold between 9:05 and 9:15 a scale out will occur. The 10 minute period DON'T start over. Cooldown = "The amount of time to wait before the rule is applied AGAIN so that the autoscale actions have time to take effect." https://learn.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-autoscale-portal#create-a-rule-to-automatically-scale-out

upvoted 4 times

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[Removed]

9 months, 1 week ago

CORRECT

upvoted 2 times

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Ni22

1 year ago

6/13/24 on exam

upvoted 3 times

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tashakori

1 year, 3 months ago

Given answer is right

upvoted 2 times

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Amir1909

1 year, 3 months ago

Correct

upvoted 2 times

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EzBL

1 year, 5 months ago

Duration value is only used for data range - how much data autoscaling system has to aggregate to determine if rule applies or not. Cooldown - how much time has to pass before next autoscale operation to trigger. So once you start you app the first autoscale may happen not earlier than after duration value (because you need specific data range). Each next will happen every cooldown value

upvoted 1 times

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AzZnLuVaBoI

2 years, 2 months ago

On the Exam 3/29/23.

upvoted 9 times

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Rams_84zO6n

2 years, 3 months ago

The autoscale job runs every 30 to 60 seconds, depending on the resource type. Until 9:10 AM, rules can't apply because granularity period not reached. At 9:10 AM, count=3. It quickly jumps up every minute to max value in drop-down which is 5. Between 10-11 AM, the count starts dropping from 5 to 1. So Box-1: 5, Box-2: 1

upvoted 3 times

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zellck

2 years, 4 months ago

1. 3 (initial count for 2 + scale out 1) 2. 1 (scale in until min. 1 instance)

upvoted 3 times

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kameltz

2 years, 5 months ago

Answers are box-1 : 3 and box-2: 1 for the second choice without any countdown duration, the default is 10 mins, so it will reach the minimum of VM.

upvoted 1 times

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Rizwannazirabbasi

2 years, 7 months ago

this is correct only .. at 10 am now VMs are it checks every ten minutes .. utilization is down to 15 percent for 1 hour .. so it will be one for box no 2

upvoted 1 times

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