Google Exam Professional Cloud Network Engineer 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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Sherron

8 months 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

8 months 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

8 months 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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8 months ago

I believe the answer is B) /25.

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