Quiz 2 of 5: Compute and networking
4
What are the EKS Kubernetes version support windows?
Why: Plan upgrades inside the standard window to avoid the extended-support premium, and never rely on it as a plan. Check the current EKS version calendar and pricing page.
5
New Pods stay Pending on small instance types although CPU and memory are free. What is the likely cause?
Why: With the VPC CNI, Pods use secondary IPs on ENIs. Max Pods per node is ENIs x (IPs per ENI - 1) + 2 in default mode, so small instances run out of Pod slots first. Prefix delegation raises the limit.
6
The whole VPC CIDR is nearly exhausted by Pods. Which fix addresses that specific problem?
Why: Prefix delegation raises density per node but still consumes VPC addresses. Custom networking moves Pod IPs to a different CIDR, and IPv6 removes the limit.