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CKA study material · question 788 of 1000

A cluster deploys NodeLocal DNSCache. Which two effects does it have on a Pod's DNS queries? Choose two.

  1. They no longer require DNAT to a CoreDNS cluster IP
  2. They must be rewritten to use TCP by the application
  3. Cluster names are answered locally on a cache hit
  4. They bypass the Pod's search domains
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Answer: A. They no longer require DNAT to a CoreDNS cluster IP
C. Cluster names are answered locally on a cache hit

The local agent answers from cache and only asks CoreDNS on a miss, and because the query goes to a node-local address it avoids the DNAT and connection tracking of a Service IP.

Source: Using NodeLocal DNSCache in Kubernetes Clusters (Kubernetes) — Introduction

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