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System Design for Python Juniors
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Module 6 · Real-World System Design Cases
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Design DNS resolver
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📝 **Question:** Why does anycast make DNS fast? 📋 Pick the right answer. 💡 **Hint:** Re-read the theory above if unsure.
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📝 **Question:** Why does anycast make DNS fast? 📋 Pick the right answer. 💡 **Hint:** Re-read the theory above if unsure.
A
DNS over TCP is faster than UDP at modern packet sizes — anycast just means the TCP option is enabled on more resolver nodes by default.
B
Same IP advertised from many DCs; BGP routes you to the nearest; latency = local hop instead of cross-ocean.
C
DNS is not actually fast — anycast is a marketing claim, and 8.8.8.8 typically responds in 200ms regardless of where the client lives.
D
Speed comes from in-resolver caching only — anycast routing has no measurable effect once the local DNS server has the record cached at TTL.
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