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Google Professional Cloud Network Engineer Exam - Topic 5 Question 96 Discussion

Actual exam question for Google's Professional Cloud Network Engineer exam
Question #: 96
Topic #: 5
[All Professional Cloud Network Engineer Questions]

You are designing an IP address scheme for new private Google Kubernetes Engine (GKE) clusters, Due to IP address exhaustion of the RFC 1918 address space in your enterprise, you plan to use privately used public IP space for the new dusters. You want to follow Google-recommended practices, What should you do after designing your IP scheme?

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Suggested Answer: D

The correct answer is D. Create privately used public IP primary and secondary subnet ranges for the clusters. Create a private GKE cluster with the following options selected: --disable-default-snat, --enable-ip-alias, and --enable-private-nodes.

This answer is based on the following facts:

Privately used public IP (PUPI) addresses are any public IP addresses not owned by Google that a customer can use privately on Google Cloud1. You can use PUPI addresses for GKE pods and services in private clusters to mitigate address exhaustion.

A private GKE cluster is a cluster that has no public IP addresses on the nodes2. You can use private clusters to isolate your workloads from the public internet and enhance security.

The --disable-default-snat option disables source network address translation (SNAT) for the cluster3. This option allows you to use PUPI addresses without conflicting with other public IP addresses on the internet.

The --enable-ip-alias option enables alias IP ranges for the cluster4. This option allows you to use separate subnet ranges for nodes, pods, and services, and to specify the size of those ranges.

The --enable-private-nodes option enables private nodes for the cluster5. This option ensures that the nodes have no public IP addresses and can only communicate with other Google Cloud resources in the same VPC network or peered networks.

The other options are not correct because:

Option A is not suitable. Creating RFC 1918 primary and secondary subnet IP ranges for the clusters does not solve the problem of address exhaustion. Re-using the secondary address range for pods across multiple private GKE clusters can cause IP conflicts and routing issues.

Option B is also not suitable. Creating RFC 1918 primary and secondary subnet IP ranges for the clusters does not solve the problem of address exhaustion. Re-using the secondary address range for services across multiple private GKE clusters can cause IP conflicts and routing issues.

Option C is not feasible. Creating privately used public IP primary and secondary subnet ranges for the clusters is a valid step, but creating a private GKE cluster with only --enable-ip-alias and --enable-private-nodes options is not enough. You also need to disable default SNAT to avoid IP conflicts with other public IP addresses on the internet.


by Brandon at Sep 14, 2024, 09:26 AM

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Blondell
4 months ago
Not sure about reusing secondary ranges, could lead to conflicts.
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Elmer
4 months ago
Agree with C, it aligns with best practices.
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Dolores
4 months ago
Surprised they suggest using public IP space! Is that really a good idea?
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Izetta
4 months ago
I think option D is better with the SNAT disabled.
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Wava
4 months ago
Definitely go with option C for private clusters!
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Phung
5 months ago
I feel like option D is the most comprehensive since it mentions disabling default SNAT, which we learned is important for private clusters.
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Franklyn
5 months ago
I have a vague recollection that we should create primary and secondary subnet ranges, but I can't remember if we should use RFC 1918 or the privately used public IP space.
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Marylou
5 months ago
I think we practiced a question similar to this where we had to choose between enabling IP aliasing and private nodes. I feel like option C might be the right choice.
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Arminda
5 months ago
I remember we discussed the importance of using privately used public IP space, but I'm not sure if we should focus on pods or services for the secondary address range.
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Trevor
5 months ago
The key here is to use the privately used public IP space and enable the right cluster options. I feel confident that option D is the best approach.
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Rodolfo
5 months ago
Hmm, I'm not sure about reusing the secondary address range across multiple clusters. Wouldn't that create potential conflicts? I'm leaning towards option D to be on the safe side.
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Christoper
5 months ago
I think option C is the way to go - create the privately used public IP ranges and enable the necessary options for a private GKE cluster.
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Tresa
5 months ago
Okay, let's think this through step-by-step. We need to use privately used public IP space for the new clusters, and follow Google's recommended practices.
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Audra
5 months ago
This question seems straightforward, but I want to make sure I understand the details correctly before answering.
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Dean
6 months ago
This seems straightforward enough. I'll start by estimating the companies' earnings and then apply the appropriate valuation formula to determine the maximum price. As long as I don't make any silly mistakes, I should be able to get the right answer.
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Rosann
1 year ago
Option D, hands down. I'm just glad I don't have to worry about IP exhaustion in my personal life. Imagine running out of IP addresses for your toaster or something.
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Eun
1 year ago
I hope the exam doesn't ask us to design the actual IP scheme. That sounds like a headache! Option D is probably the best choice to avoid any IP address nightmares.
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Rosio
1 year ago
As a Google-recommended practice, Option D definitely seems like the way to go. Can't go wrong with disabling default SNAT and enabling IP aliasing.
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Coral
1 year ago
Creating privately used public IP ranges and selecting specific options for the private GKE cluster is the best approach.
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Krissy
1 year ago
I agree, following Google-recommended practices is important for setting up private GKE clusters.
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Hyman
1 year ago
Option D definitely seems like the way to go. Can't go wrong with disabling default SNAT and enabling IP aliasing.
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Cathern
1 year ago
Hmm, I'm not too sure about reusing the secondary address range for services across multiple clusters. Seems like that could lead to potential conflicts. Option D seems safer.
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Deeanna
1 year ago
It's important to follow Google-recommended practices to ensure smooth operation of the GKE clusters.
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Candra
1 year ago
Option D does seem like the safer choice with the specified options selected.
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Pearly
1 year ago
I agree, reusing the secondary address range for services could cause conflicts.
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Micah
1 year ago
Option D looks like the way to go. Using privately used public IP space and disabling default SNAT seems to be the recommended approach for this scenario.
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Yaeko
1 year ago
Creating a private GKE cluster with the specified options will help ensure efficient use of IP space and maintain network security.
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Erasmo
1 year ago
I agree, it's important to follow Google-recommended practices when designing IP address schemes for GKE clusters.
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Glory
1 year ago
Option D looks like the way to go. Using privately used public IP space and disabling default SNAT seems to be the recommended approach for this scenario.
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Bobbye
2 years ago
I prefer option D because enabling IP alias and private nodes can provide better security and isolation for the clusters.
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Ashley
2 years ago
I agree with Hailey, option A seems like the most efficient way to manage IP addresses in the new GKE clusters.
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Hailey
2 years ago
I think option A is the best choice because re-using the secondary address range for pods across multiple clusters can help optimize IP address usage.
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