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Which DNS record types do you actually touch as an ops engineer, and where does each one bite?

A and AAAA are the easy part. The bites live at the zone apex, inside 255-byte TXT chunks, in CAA blocking your renewals, and in SRV records half the internet ignores.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

A and AAAA are the easy part. The bites live at the zone apex, inside 255-byte TXT chunks, in CAA blocking your renewals, and in SRV records half the internet ignores.

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