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CKA study material · question 704 of 1000

A Service of type ExternalName maps db to db.example.com. What does a Pod's DNS lookup of db return?

  1. An A record with the Service's cluster IP
  2. An A record with the external host's address, resolved by the cluster
  3. A set of A records for the external host's endpoints
  4. A CNAME record pointing at db.example.com
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Answer: D. A CNAME record pointing at db.example.com

ExternalName is answered with a CNAME, so the redirection happens purely in DNS and the cluster proxies or forwards nothing.

Source: Service (Kubernetes) — Service type › type: ExternalName

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