Exam Associate Cloud Engineer topic 1 question 259 discussion

A. Same as question 129. Option A involves modifying the subnet range of the existing VPC network to increase the number of available IP addresses. By changing the subnet range to 172.16.20.0/24, you will have a larger IP address range to allocate to new VMs, allowing them to communicate with the Dataproc cluster. To expand the IP range of a Compute Engine subnetwork, you can use: gcloud compute networks subnets expand-ip-range NAME

pls refer to https://cloud.google.com/blog/products/gcp/subnetwork-expansion-adds-even-more-flexibility-to-your-google-cloud-platform-private-networks

although “modifying” (expanding) the primary range might be an option in some cases, the recommended solution in this scenario is Option B, as it is simpler, safer, and minimizes any potential disruptions to your existing resources.

B. Create a new Secondary IP Range in the VPC and configure the VMs to use that range.

A is incorrect because: "You can expand the primary IPv4 range of an existing subnet by modifying its subnet mask, setting the prefix length to a smaller number". PREFIX!

gcloud compute networks subnets expand-ip-range - expand the IP range of a Compute Engine subnetwork

The question state "using the minimum number of steps" , then it should be A.

I would say A is the answer, but I have no idea what the Q means when specifying "You want to add new VMs to communicate with your cluster using the minimum number of steps." Does it mean that you want to add VMs and use the same subnet or add new VMs and use another subnet and then want those VMs communicating with the VMs in the other subnet?

The reason A isn't correct is because you can only expand a subnet by "setting the prefix length to a smaller number" See: https://cloud.google.com/vpc/docs/create-modify-vpc-networks#expand-subnet The reason B isn't correct is because you can only use a secondary (aka 'alias') IP address when there is a primary already in place. In this scenario this isn't possible to do for the new VMs because there are no primary IP addresses available. Therefore C seems like a feasible approach, with fewer steps than D (even if D is possible, which I don't know).

The correct answer is **A**. To add new VMs to communicate with your Dataproc cluster using the minimum number of steps, you should: - **Modify the existing subnet range** to 172.16.20.0/24. This will expand the range of available IP addresses in the subnet, allowing you to add new VMs. The other options (B, C, and D) are not correct because they involve more steps than necessary (such as creating a new Secondary IP Range, a new VPC network, or enabling VPC Peering), which is not aligned with the requirement of using the minimum number of steps.

Answer is A

Option C is right one as we dont have additional private ips left For option D, This option is viable but is more complex than simply creating a new VPC and establishing VPC Peering.

Per ChatGPT, Option B aligns with the requirement of adding new VMs to communicate with the Dataproc cluster using the minimum number of steps while addressing the constraint of no available private IP addresses in the existing subnetwork.

B. Create a new Secondary IP Range in the VPC and configure the VMs to use that range.