DNS Resolution

DNS is the first hop of every request and the quietest place for an outage to hide. Change the query type, TTL, resolver location and the DNSSEC / DNS-over-TLS toggles and watch the server-computed round trips, the cold-resolution latency that lands in TTFB before the TCP handshake begins, the negative-cache TTL that outlives your deploy, and the two security switches that answer two different threats — validated against BIND 9.20.29 (query_lookup, dns_validator_create) and glibc 2.44 (__res_context_send, ns_parserr).

• ✓All current + future modules
• ✓Full kata library
• ✓Progress dashboard + weak area analysis

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