Google Professional Cloud Network Engineer Question 169
Select 3Google Cloud PlatformYou are designing an IP addressing plan for a Google Kubernetes Engine (GKE) cluster that will host multiple workloads in a shared VPC. The GKE cluster requires high scalability and needs to support multiple node pools, each with different CIDR ranges. Which of the following considerations should you keep in mind when designing the IP address allocation for this cluster?
- A
Ensure that the Pod IP CIDR ranges do not overlap with the VPC subnet ranges.
- B
Use alias IP ranges for Pods to enable better network security and visibility.
- C
Configure an IP address range for services that overlaps with the Pod IP address range to save address space.
- D
Reserve sufficient IP address space for future scaling of both nodes and Pods.
- E
Assign IP addresses for nodes, Pods, and services from the same subnet to simplify routing.
Show answer and explanation
Correct answers: A, B, D
Explanation
When designing an IP addressing plan for a GKE cluster, it is important to avoid overlapping IP ranges between Pods, services, and VPC subnets to ensure proper routing and avoid conflicts. Using alias IP ranges for Pods provides better isolation and visibility for network traffic. Sufficient IP space must be reserved to accommodate future scaling of nodes and Pods, as GKE clusters may grow over time. Overlapping or using the same subnet for nodes, Pods, and services is a poor practice and can lead to IP exhaustion and operational challenges.
- A. Correct.
Pod IP CIDR ranges must not overlap with the VPC subnet ranges to avoid routing conflicts within the VPC.
- B. Correct.
Using alias IP ranges for Pods allows for enhanced network security and visibility, as it separates Pod traffic from other workloads and simplifies firewall rule configuration.
- C. Incorrect.
The service IP address range should not overlap with the Pod IP address range to avoid potential conflicts in IP allocation.
- D. Correct.
Reserving sufficient IP address space is critical to ensure future scalability of the cluster as the number of nodes and Pods increases.
- E. Incorrect.
Assigning IP addresses for nodes, Pods, and services from the same subnet is not recommended as it can lead to IP exhaustion and routing complexity.