Google Professional Cloud Network Engineer Exam - Topic 2 Question 74 Discussion

Actual exam question for Google's Professional Cloud Network Engineer exam

Question #: 74
Topic #: 2

[All Professional Cloud Network Engineer Questions]

Your company is planning a migration to Google Kubernetes Engine. Your application team informed you that they require a minimum of 60 Pods per node and a maximum of 100 Pods per node Which Pod per node CIDR range should you use?

A/24

B/25

C/26

D/28

Show Suggested Answer

Suggested Answer: B

The correct answer is B. /25.

This answer is based on the following facts:

The Pod per node CIDR range determines the size of the IP address range that is assigned to each node for Pods1. The Pods that run on a node are allocated IP addresses from the node's assigned CIDR range1.

The size of the CIDR range corresponds to the maximum number of Pods per node. For example, a /24 CIDR range allows up to 256 IP addresses, but the default maximum number of Pods per node for Standard clusters is 1102. A /25 CIDR range allows up to 128 IP addresses, which is enough for 100 Pods per node.

The other options are not correct because:

Option A is too large. A /24 CIDR range allows more IP addresses than needed for 100 Pods per node. This could result in inefficient use of the IP address space and limit the number of nodes that can be created in the cluster.

Option C is too small. A /26 CIDR range allows only 64 IP addresses, which is not enough for 60 Pods per node. This could result in insufficient capacity to schedule Pods on the nodes.

Option D is also too small. A /28 CIDR range allows only 16 IP addresses, which is far below the minimum requirement of 60 Pods per node. This could result in Pod scheduling failures and poor performance.

by Karl at Dec 24, 2023, 04:36 PM

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Denny

9 months ago

I thought /24 was the standard for this kind of setup.

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Shonda

9 months ago

/26 seems too tight for 100 Pods, right?

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Joni

10 months ago

Wait, can we really fit 100 Pods in a /25?

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Wenona

10 months ago

Totally agree, /25 is the way to go!

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Jade

10 months ago

You need at least /25 for 128 IPs.

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Carole

10 months ago

I feel like /28 is way too small for our needs, but I can't remember the exact calculations for Pods per node.

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Glory

11 months ago

I practiced a similar question where we had to calculate IP ranges for Pods, and I think /25 could work since it provides 128 addresses, but I'm not confident.

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Miesha

11 months ago

I'm not entirely sure, but I think a /26 might only allow for 64 addresses, which could be tight for the minimum requirement of 60 Pods.

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Wade

11 months ago

I remember that each Pod requires an IP address, and I think a /24 gives us 256 addresses, which should be enough for the max of 100 Pods per node.

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Alana

11 months ago

I've got this! The key is to find the CIDR range that can accommodate the required number of Pods per node. Let me work through the options.

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Twila

11 months ago

Whoa, this is a bit more complex than I expected. I better review my notes on Kubernetes networking to make sure I don't miss anything important.

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Desirae

11 months ago

Alright, time to put on my problem-solving hat. I'll need to do some quick calculations to figure out the best CIDR range for this scenario.

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Agustin

11 months ago

Okay, let's see. They need a minimum of 60 Pods per node and a maximum of 100 Pods per node. I think I know where to start with this.

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Delmy

11 months ago

Hmm, this seems like a tricky one. I'll need to think through the requirements carefully to determine the appropriate CIDR range.

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Jerrod

11 months ago

I'm a bit confused. There are a few options here, and I'm not sure which two to choose. I'll need to review the Azure key vault documentation to make sure I understand the differences between these parameters.

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Zona

11 months ago

I'm pretty confident that the answer is option E as well. The '>' symbol is used for output redirection and will overwrite an existing file, which is what the question is asking for.

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Ty

11 months ago

This question seems straightforward. I think the key is to identify the component that connects the mains and backup power sources, which is likely the automatic transfer switch.

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Sherron

2 years ago

You know, Essie has a point. The default /22 would give us 1024 Pods per node, which is way more than they need. But I guess they want to be super efficient with their resources. *shrugs* Either way, I think C) /26 is the way to go.

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Essie

2 years ago

You both make good points. But I'm wondering, why do they need such a specific range? Couldn't they just use the default /22 CIDR block and call it a day? *chuckles* Seems like they're being a bit too picky if you ask me.

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Jaime

2 years ago

I'm not so sure about that. A /24 CIDR range would give us 256 Pods per node, which is more than the maximum of 100 that was specified. I think the safer option would be C) /26, which gives us 64 Pods per node.

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Jesse

2 years ago

Hmm, this is an interesting question. I think the answer is B) /25, as that would provide a range of 64 to 128 Pods per node, which fits the requirements given.

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