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Google Professional Cloud Network Engineer Exam - Topic 5 Question 106 Discussion

You have configured a Compute Engine virtual machine instance as a NAT gateway. You execute the following command:gcloud compute routes create no-ip-internet-route \--network custom-network1 \--destination-range 0.0.0.0/0 \--next-hop instance nat-gateway \--next-hop instance-zone us-central1-a \--tags no-ip --priority 800You want existing instances to use the new NAT gateway. Which command should you execute?
B) gcloud compute instances add-tags [existing-instance] --tags no-ip
A) sudo sysctl -w net.ipv4.ip_forward=1
C) gcloud builds submit --config=cloudbuild.waml --substitutions=TAG_NAME=no-ip
D) gcloud compute instances create example-instance --network custom-network1 \ --subnet subnet-us-central \ --no-address \ --zone us-central1-a \ --image-family debian-9 \ --image-project debian-cloud \ --tags no-ip

Google Professional Cloud Network Engineer Exam - Topic 5 Question 106 Discussion

Actual exam question for Google's Professional Cloud Network Engineer exam
Question #: 106
Topic #: 5
[All Professional Cloud Network Engineer Questions]

You have configured a Compute Engine virtual machine instance as a NAT gateway. You execute the following command:

gcloud compute routes create no-ip-internet-route \

--network custom-network1 \

--destination-range 0.0.0.0/0 \

--next-hop instance nat-gateway \

--next-hop instance-zone us-central1-a \

--tags no-ip --priority 800

You want existing instances to use the new NAT gateway. Which command should you execute?

Show Suggested Answer Hide Answer
Suggested Answer: B

https://cloud.google.com/sdk/gcloud/reference/compute/routes/create

In order to apply a route to an existing instance we should use a tag to bind the route to it.


by Johnna at May 03, 2025, 09:28 AM

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Daniela
9 months ago
I thought you had to do more than just add tags.
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Maile
9 months ago
Definitely B, that’s the right move!
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Felix
9 months ago
B seems correct, but I’d double-check the instance names.
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Sherell
9 months ago
Wait, is it really that simple?
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Jacinta
9 months ago
You need to add tags to existing instances.
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Jeniffer
10 months ago
I feel like option B makes the most sense since we want existing instances to recognize the new NAT gateway.
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Ayesha
10 months ago
I'm a bit confused about the commands. Does option A actually relate to the NAT gateway setup?
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Loreen
10 months ago
I remember practicing a similar question where we had to configure NAT, and I think adding tags was the right approach.
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Lai
10 months ago
I think we need to add the tags to the existing instances, but I'm not entirely sure if it's option B or something else.
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Franklyn
11 months ago
Ah, I see now. Option B is the correct answer - we use the "gcloud compute instances add-tags" command to apply the "no-ip" tag to the existing instances. Simple but effective!
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Elroy
11 months ago
I'm a bit confused here. Do I need to enable IP forwarding on the NAT gateway instance first? Or is that not necessary?
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Kerry
11 months ago
Okay, I think I've got this. The key is to add the "no-ip" tag to the existing instances so they use the new NAT gateway. Let me double-check the options.
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Luke
11 months ago
Hmm, this looks like a tricky one. I'll need to think through the steps carefully to make sure I get the right command.
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Elli
1 year ago
Wow, this is a tricky one. I'm going to have to go with option B, though. Seems like the most logical choice to me.
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Teddy
1 year ago
Definitely, option B is the most logical step to ensure existing instances use the new NAT gateway.
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Erinn
1 year ago
That's what I was thinking too, option B seems like the way to go.
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Gerald
1 year ago
I agree, adding the 'no-ip' tag to existing instances makes sense.
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Rodolfo
1 year ago
I think option B is the correct choice.
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Lindsey
1 year ago
I agree with Mabelle, creating a new instance with the correct tags seems like the right approach.
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Sena
1 year ago
But adding tags to existing instances won't make them use the new NAT gateway.
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Mabelle
1 year ago
I disagree, I believe the answer is D.
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Jerilyn
1 year ago
Okay, let's see here. I'm going to go with option B. Tagging the existing instances with 'no-ip' seems like the way to go.
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Magdalene
1 year ago
Haha, this question is a piece of cake! Of course, the answer is B. Who would've thought configuring a NAT gateway could be so easy?
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Carma
1 year ago
Yeah, it's pretty straightforward. Just add the 'no-ip' tag to the existing instances and they'll use the new NAT gateway.
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Melissia
1 year ago
B) gcloud compute instances add-tags [existing-instance] --tags no-ip
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Sena
1 year ago
I think the answer is B.
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Telma
1 year ago
Hmm, I'm not sure about this one. Let me think it through again. Ah, I got it! The answer is B, adding the 'no-ip' tag to the existing instances.
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Jacinta
1 year ago
I'm pretty sure the answer is B) gcloud compute instances add-tags [existing-instance] --tags no-ip
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Tandra
1 year ago
Actually, I think it might be C) gcloud builds submit --config=cloudbuild.waml --substitutions=TAG_NAME=no-ip
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Mee
1 year ago
No, I believe the correct answer is B) gcloud compute instances add-tags [existing-instance] --tags no-ip
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Mona
1 year ago
I think the answer is A) sudo sysctl -w net.ipv4.ip_forward=1
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Ammie
1 year ago
The question seems straightforward. I think the answer is B, since we need to add the 'no-ip' tag to the existing instances to make them use the new NAT gateway.
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Wynell
1 year ago
Exactly, that way the existing instances will use the new NAT gateway.
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Rana
1 year ago
That makes sense, we just need to add the 'no-ip' tag to the existing instances.
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Amber
1 year ago
B) gcloud compute instances add-tags [existing-instance] --tags no-ip
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