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Google Associate Cloud Engineer Exam - Topic 2 Question 61 Discussion

Actual exam question for Google's Associate Cloud Engineer exam
Question #: 61
Topic #: 2
[All Associate Cloud Engineer Questions]

You have a managed instance group comprised of preemptible VM's. All of the VM's keepdeleting and recreating themselves every minute. What is a possible cause of thisbehavior?

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Suggested Answer: D

as the instances (normal or preemptible) would be terminated and relaunched if the health check fails either due to application not configured properly or the instances firewall do not allow health check to happen.

GCP provides health check systems that connect to virtual machine (VM) instances on a configurable, periodic basis. Each connection attempt is called a probe. GCP records the success or failure of each probe.

Health checks and load balancers work together. Based on a configurable number of sequential successful or failed probes, GCP computes an overall health state for each VM in the load balancer. VMs that respond successfully for the configured number of times are considered healthy. VMs that fail to respond successfully for a separate number of times are unhealthy.

GCP uses the overall health state of each VM to determine its eligibility for receiving new requests. In addition to being able to configure probe frequency and health state thresholds, you can configure the criteria that define a successful probe.


by Joseph at Dec 11, 2022, 11:24 AM

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Cheryl
3 months ago
I'm surprised they're recreating so often; that seems excessive!
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Vilma
3 months ago
Quota limits could also be a reason, but not as likely.
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Tyra
3 months ago
Wait, can preemptible VMs really be set to only last a minute?
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Brice
4 months ago
I think it's definitely the zonal capacity.
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Kristin
4 months ago
Sounds like a health check issue to me.
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Jaclyn
4 months ago
I thought preemptible VMs had a maximum runtime, but I can't recall if they can be set to just one minute like in option C. That seems a bit odd.
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Dino
4 months ago
I practiced a question similar to this, and I feel like the health check failing could be a reason for the VMs recreating. So maybe option D?
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Stephaine
4 months ago
I'm not entirely sure, but I think if we hit our instance quota, it might cause issues too. That could relate to option B.
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Lyda
5 months ago
I remember something about preemptible VMs being affected by zonal capacity, so option A could be a possibility.
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Buck
5 months ago
Okay, let me think this through. I know port hopping is a technique that changes protocols randomly, so I'm going to go with B.
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Herschel
5 months ago
Seems straightforward enough. I'll start by calculating the variable costs and then add them up to get the marginal cost per unit.
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Iesha
5 months ago
This seems like a straightforward MFA question, but the details about the call center setup make it a bit tricky. I'll need to think through the options carefully.
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Gary
5 months ago
I think the answer is FlightPath, since the question mentions it allows customers to see the path between instances.
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