Exam Associate Cloud Engineer topic 1 question 214 discussion

This one is tricky. First i was going with B, then i did some search. Option A and B can indeed add more IPs. However, i think the option is A because between those 2 options the option A we will add IPs without changing the any ours VMs configurations that we currently have. If we choose B might need to change our current VMs configuration in order to reflect the new IP range expanded. You guys understand what i mean? Link: https://cloud.google.com/vpc/docs/create-modify-vpc-networks#expand-subnet "If you expand the primary IPv4 range of a subnet, you might need to modify other configurations that are assuming this IP address range"

B is the correct answer When you expand a subnet's IP range in Google Cloud from /20 (255.255.240.0) to /18 (255.255.192.0), the existing virtual machines (VMs) will not experience any disruption, and their current configurations will remain intact. The subnet mask is updated automatically by Google Cloud. There are no interruptions to network connectivity for running VMs. This is impossible to do in traditional Networking(without outage). only in Google cloud :-)

Purpose of Secondary IP Range: "Adding a secondary IP range allows you to assign additional IP addresses to instances in a subnet without changing the subnet's primary IP range. This can be useful when you want to segregate traffic or allocate specific IP addresses to certain types of instances or workloads within the same subnet." In the question, no where the logical separation of vm or traffic segregation is mentioned so by expanding th eprimary ip range will increase the available ips so Option B is correct.

Option B offers a practical and scalable solution to address the shortage of IP addresses by enlarging the subnet's range in the most efficient way. Option A, while technically feasible, managing multiple IP ranges within a subnet adds complexity and can potentially lead to routing issues. Even with a secondary IP range, you'll likely need to either: 1. Configure VMs with multiple network interfaces, each assigned an IP from a different range. This adds management overhead. 2. Re-configure existing VMs with IPs from the new secondary range, potentially causing downtime or requiring complex IP address changes.

I think that if we go with option B is OK but we need to configure the new mask on VMs If we go with option A, for me is OK but VMs are not in the same LAN, we need to configure connectivity but nothing related with that requirement in the question...so maybe A is more accurate

B can not be the answer we can use B if the IP address are primarily used by Interfaces or services with in VM

A. Add a secondary IP range 10.1.0.0/20 to the subnet: • This option involves adding a secondary IP range to the existing subnet. This can provide additional IP addresses without changing the existing primary IP range. B. Change the subnet IP range from 10.0.0.0/20 to 10.0.0.0/18: • This involves expanding the current subnet's CIDR range to a larger block (from /20 to /18). This expansion will significantly increase the number of available IP addresses. • However, changing the CIDR block of an existing subnet is not straightforward in GCP. It typically requires creating a new subnet with the desired range and migrating resources, which can be complex and disruptive.

All subnets have a primary CIDR range, which is the range of internal IP addresses that define the subnet. Each VM instance gets its primary internal IP address from this range. You can also allocate alias IP ranges from that primary range, or you can add a secondary range to the subnet and allocate alias IP ranges from the secondary range. Use of alias IP ranges does not require secondary subnet ranges. These secondary subnet ranges merely provide an organizational tool. https://cloud.google.com/vpc/docs/alias-ip

A is the Answer (1st) we can use secondary IP range, since we are talking about VMs. You can optionally add secondary IP address ranges to a subnet, which are only used by alias IP ranges. However, you can configure alias IP ranges for instances from the primary or secondary range of a subnet. Each primary or secondary IPv4 range for all subnets in a VPC network must be a unique valid CIDR block. (2nd) 10.1.0.0/20 is a valid block and it will not overlap with 10.0.0.0/20 ( The range is 10.0.0-15.0-255). Remember the keywords from the question "primary" and "ip add for the VM)

B is the correct answer

https://cloud.google.com/vpc/docs/create-modify-vpc-networks#expand-subnet https://cloud.google.com/sdk/gcloud/reference/compute/networks/subnets/expand-ip-range

The ask is to add more IPs, it's not about to keep the VM ins same subnet or to keep communication open between existing and new VMs, so the answer should be A...

https://cloud.google.com/vpc/docs/create-modify-vpc-networks#expand-subnet

Clearly B

Should be B for subnet expansion

https://cloud.google.com/sdk/gcloud/reference/compute/networks/subnets/expand-ip-range https://cloud.google.com/vpc/docs/create-modify-vpc-networks#expand-subnet https://techlibrary.hpe.com/docs/otlink-wo/CIDR-Conversion-Table.html Expanding the subnet to a smaller prefix will allow more primary internal IP addresses. I don't know why gw2100 "withdraws" his vote for B and changes it to A - it's possible to add a secondary IP range as in answer A, but expanding the initial range as in B would work just fine. C is shrinking the range - cannot work. Not sure about D

should be B. you expand the ip with a bigger network