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Design how traffic reaches three regions and how it leaves one that is failing. Last time the failover took nineteen minutes.

DNS time-to-live is a suggestion and nineteen minutes is what believing it costs. The mechanism you choose decides your failover time, and the health check you choose decides whether it fires at all.

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.

DNS time-to-live is a suggestion and nineteen minutes is what believing it costs. The mechanism you choose decides your failover time, and the health check you choose decides whether it fires at all.

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