Google Exam Professional-Cloud-Network-Engineer Topic 2 Question 74 Discussion

The correct answer is B. /25.

This answer is based on the following facts:

The Pod per node CIDR range determines the size of the IP address range that is assigned to each node for Pods1. The Pods that run on a node are allocated IP addresses from the node's assigned CIDR range1.

The size of the CIDR range corresponds to the maximum number of Pods per node. For example, a /24 CIDR range allows up to 256 IP addresses, but the default maximum number of Pods per node for Standard clusters is 1102. A /25 CIDR range allows up to 128 IP addresses, which is enough for 100 Pods per node.

The other options are not correct because:

Option A is too large. A /24 CIDR range allows more IP addresses than needed for 100 Pods per node. This could result in inefficient use of the IP address space and limit the number of nodes that can be created in the cluster.

Option C is too small. A /26 CIDR range allows only 64 IP addresses, which is not enough for 60 Pods per node. This could result in insufficient capacity to schedule Pods on the nodes.

Option D is also too small. A /28 CIDR range allows only 16 IP addresses, which is far below the minimum requirement of 60 Pods per node. This could result in Pod scheduling failures and poor performance.