Practice Test 2 | Google Cloud Certified Professional Cloud Network Engineer | Dumps | Mock Test
A company needs a network design for its VPC-native cluster. You have been provided with the specifications below.
- The initial Cluster size is 3 but will grow to a maximum of 8 nodes.
- User-managed secondary IP ranges with the minimum CIDR blocks to achieve this.
- A maximum number of pods per node will to be used.
- Services could grow to 2000.
Using GCP best practice, which of the designs meets the requirements?
A. A /25 for the subnet size, pod IP block of /20 and a services IP block of /19.
B. A /26 for the subnet size, pod IP block of /21 and a services IP block of /20
C. A /28 for the subnet size, pod IP block of /21 and a services IP block of /21.
D. A /27 for the subnet size, pod IP block of /23 and a services IP block of /22.
Answer: C
The maximum pod per is 110. Therefore for 8 nodes = 880 pods (IP addresses). A /22 has 1024 addresses and is the minimum needed for the pod IP CIDR. A /28 has 16 addresses (for a maximum of 12 nodes) is the minimum needed for a cluster of 8 nodes, also a /21 CIDR has 2048 addresses is the minimum needed for the Services IP CIDR.
Option A is incorrect because the subnet size is too large with 128 addresses, the pod IP is also large with 4096 addresses, and services IP CIDR with 8192 addresses.
Option B is incorrect because subnet size is too large with 64 addresses, pod IP is also large with 2048 addresses, and services IP CIDR with 4096 addresses
Option C is correct
Option D is incorrect because subnet size is large with 32 addresses, pod IP is too small with 512 addresses, and services IP CIDR with 1024 addresses
https://cloud.google.com/kubernetes-engine/docs/how-to/alias-ips provides more insight into creating a VPC-native GKE cluster.
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