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CKA study material · question 784 of 1000

A Service sets ipFamilyPolicy to RequireDualStack and is applied to a single-stack cluster. What happens?

  1. It is created with one address and marked SingleStack
  2. It is created and stays Pending until dual-stack is enabled
  3. It is created with a warning annotation
  4. Creating the Service fails
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Answer: D. Creating the Service fails

RequireDualStack fails outright where dual-stack is unavailable; PreferDualStack is the setting that falls back quietly to single-stack behaviour.

Source: IPv4/IPv6 dual-stack (Kubernetes) — Services

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