User:Swapnil durgade/Bind Notes

Purpose of DNS

1. Resolve hostname into IP addresses (Forward lookup)
2. Resolve IP address into hostname (Reverse lookup)
3. Allow machines to be logically grouped by name 'domains'
4. Provide email routing information

Important Information

1. Domain names are separated by dots with topmost element on right.
2. Each element could be 63 character long.
3. The entire element could be 255 character long.
4. letters, numbers or dashes may be used in an element.
5. Hostname map to IP addresses in a many-to-many relationship
6. Distributed management

Zones and Domains

1. A domain is complete sub-tree of the hierarchical namespace
2. A zone is a part of the domain managed by a particular server. 
   Subdomains are different than zones. 
   A zone may include all subdomains in a domain or may delegate authority for some subdomain as separate zones on other name servers.
   A zone represents the scope of administration for which one body is responsible

Master/Slave Primary/Secondary DNS/Name Servers

1. Master DNS server is also called Primary DNS Server
2. Contains master copy of a data for a zone
3. Slave DNS server is also called Secondary DNS server
4. Slave provides backup to master server
5. Slave maintain synchronization with his master server
6. Both Master and Slave contain authoritative data.
7. Slave can get its data from other slave server
8. Ther is only one Master server per zone

-Swapnil (Wednesday, December 14, 2005) Email- swapnil_durgade@yahoo.com