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I got this question in one the trainings I did in udemy: https://www.udemy.com/course/google-cloud-associate-engineer-exam-practice-tests/?referralCode=810D02D4A159FC3E36CC
B is correct. Pay attention to the question, is talking about custom VPC subnet and is not mentioning you will use automatic subnet mode creation. If you set subnet to custom, the minimum size is /8.
B is correct
Use 10.0.0.0/8 CIDR range. is the right answer.
The private network range is defined by IETF (Ref: https://tools.ietf.org/html/rfc1918) and adhered to by all cloud providers. The supported internal IP Address ranges are
1. 24-bit block 10.0.0.0/8 (16777216 IP Addresses)
2. 20-bit block 172.16.0.0/12 (1048576 IP Addresses)
3. 16-bit block 192.168.0.0/16 (65536 IP Addresses)
10.0.0.0/8 gives you the most extensive range - 16777216 IP Addresses.
even though option B (10.0.0.0/8) offers a larger total number of addresses, within a single subnet, the /12 prefix (172.16.0.0/12) provides more usable IP addresses due to a smaller network portion dedicated to the subnet itself. This allows you to assign more IP addresses to devices within that single subnet.
The best option is **B. 10.0.0.0/8**.
This is because the `/8` in `10.0.0.0/8` denotes that only the first 8 bits (out of 32 bits in an IPv4 address) are reserved for identifying the network part of the address. The remaining 24 bits are available for host addresses within the network, which makes the subnet range as large as possible.
Option A (`0.0.0.0/0`) represents all possible IPv4 addresses, which is not a valid or safe range for a single subnet. Options C (`172.16.0.0/12`) and D (`192.168.0.0/16`) have more bits reserved for the network part of the address, which leaves fewer bits for host addresses within the network, thus making the subnet range smaller than `10.0.0.0/8`. Therefore, option B is the best choice for a subnet with the largest possible range.
In Google Cloud Platform (GCP), when creating a VPC network, you should use the IP ranges that are reserved for private networks as defined by the RFC 1918. Here are the private IP address ranges defined by RFC 1918:
10.0.0.0 to 10.255.255.255 (10.0.0.0/8)
172.16.0.0 to 172.31.255.255 (172.16.0.0/12)
192.168.0.0 to 192.168.255.255 (192.168.0.0/16)
From the provided options:
A. 0.0.0.0/0: This is not a private IP address range. It represents all possible IP addresses.
B. 10.0.0.0/8: This is a private IP range that covers all IP addresses from 10.0.0.0 to 10.255.255.255. It's the largest range among the options.
C. 172.16.0.0/12: This is a private IP range, but it's smaller than 10.0.0.0/8.
D. 192.168.0.0/16: This is also a private IP range, but it's smaller than both B and C.
So, if you want the subnet's range to be as large as possible:
The correct answer is B. 10.0.0.0/8.
B is the correct answer: 10.0.0.0/8.
This is the largest subnet range that you can use in a custom VPC. It has 16,777,216 addresses, which is more than enough for most organizations.
The other options are smaller subnet ranges:
0.0.0.0/0 is the entire IPv4 address space. It is not recommended to use this range for a subnet, because it would give you too many IP addresses to manage.
172.16.0.0/12 has 1,048,576 addresses.
192.168.0.0/16 has 65,536 addresses.
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