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CKA study material · question 80 of 1000

Why is an odd number of control-plane nodes preferred in a highly available cluster?

  1. It helps leader selection when a machine or zone is lost
  2. It halves the number of certificates needed
  3. It allows kube-proxy to run in ipvs mode
  4. It is required by the CNI specification
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Answer: A. It helps leader selection when a machine or zone is lost

An odd count makes leader selection cleaner in the face of a machine or zone failure.

Source: Creating Highly Available Clusters with kubeadm (Kubernetes) — Before you begin

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