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What Is Cache Flush?

Cache Flush — the removal of stored DNS answers from a client or resolver so subsequent queries must obtain fresh data.

The mechanism changes how DNS queries are transported or processed; it does not make incorrect DNS data correct. Encryption protects the channel to the selected resolver, while answer integrity and logging policy depend on that resolver and DNSSEC.

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Popular Questions About Cache Flush

  • What does Cache Flush mean?

    Cache Flush — the removal of stored DNS answers from a client or resolver so subsequent queries must obtain fresh data.

  • What changes when it is used?

    It changes the transport, processing point, or local caching behavior of a DNS query. This can improve privacy and control, but it also affects filtering, troubleshooting, and resolver selection.

  • What should be checked before enabling it?

    Verify the resolver endpoint and trust model, client support, network policy, fallback path, and logging. Separately confirm where DNSSEC validation is performed when it is required.

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