Saturday, January 01, 2005

How does DNS resolve FQDNs to IP addresses?

The following process occurs:
  • A DNS request is sent to a local DNS server.
  • Before forwarding the request to a root server, the DNS server checks its local cache to determine whether the name has recently resolved. If there is an entry in the local cache, the IP address is returned to the client.
  • If no entry exists in the local cache, the request is sent by the DNS server to a root name server.
  • The root name server refers the DNS server to a name server responsible for the first-level domain within the hostname.
  • The original DNS server is referred to second-level DNS servers, and then third-level DNS servers, until one of them can resolve the hostname to an IP address and return the results back to the client.

I didn't know the process until now.

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