DNS: iterated queries

recursive query:

• puts burden of name resolution on contacted name server

• heavy load?

iterated query:

• contacted server replies with name of server to contact

• “I don’t know this name, but ask this server”

requesting host

surf.eurecom.fr

gaia.cs.umass.edu

root name server

1

2

3

4

5

6

authoritative name server

dns.cs.umass.edu

7

8

iterated query

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