Lectures notes for 2010 - KTH

Zones
A zone is a subtree of the DNS tree which is managed separately.
Each zone must have multiple name servers:
• a primary name server for the zone
• gets its data from disk files (or other stable store)
• must know the IP address of one or more root servers
• one or more secondary name servers for the zone
• get their data by doing a zone transfer from a primary
• generally query their primary server every ~3 hours
To find a server you may have to walk the tree up to the root or possibly from the
root down (but the later is not friendly).
Maguire Zones 4: 45 of 74
maguire@kth.se 2010.03.21 Internetworking/Internetteknik