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A cluster's API server is reached on port 443 rather than 6443. What does that tell you?

  1. The cluster is misconfigured and should be corrected
  2. A load balancer is listening on 443 or the default port was overridden
  3. The API server is running without TLS
  4. The cluster uses an aggregated API server
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Answer: B. A load balancer is listening on 443 or the default port was overridden

All the published port numbers are defaults that may be overridden, and putting the API server behind a load balancer on 443 is named as a common variation.

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

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