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Neo Kim's avatar

hey Shalini, good question! I should've instead written, '13 root server clusters'.

Here are some ways the root servers scale:

- they have replicas: 1,936 root server instances across the world

- they route the requests to the closest available server (via anycast routing)

- caching values at different client levels before the root server reduces the traffic

I found a site to track root servers: https://root-servers.org/

The client request uses UDP for low overhead and fast response. Hope it helps!

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Shalini's avatar

Thank you so much Neo!

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