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CKA study material · question 292 of 1000

External clients cannot reach a NodePort Service through a firewall. Which range must be open?

  1. TCP 2379-2380
  2. TCP 6443 only
  3. TCP and UDP 30000-32767
  4. TCP 10250-10259
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Answer: C. TCP and UDP 30000-32767

NodePort Services default to TCP and UDP 30000-32767, which must be open on every node.

Source: Ports and Protocols (Kubernetes) — Worker node(s)

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