Difference between revisions of "BIND&DNS Notes"
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[[Category: OPS335]][[Category:rchan]] | [[Category: OPS335]][[Category:rchan]] | ||
| + | = What is DNS (Domain Name System)? = | ||
| + | * a hierarchical, distributed database | ||
| + | * for mapping Internet host names to IP addresses and vice versa | ||
| + | * provides mail routing information | ||
| + | = What are the components in the DNS? = | ||
| + | * DNS Clients | ||
| + | * resolver library | ||
| + | * DNS server | ||
| + | DNS clients (e.g. Web browser is one of those) look up information in the DNS by calling a resolver library, which sends queries to one or more name servers and interprets the response. | ||
| + | * Domains and Domain Names | ||
| + | * Zones | ||
| + | = DNS Servers = | ||
| + | == Authoritative Name Servers == | ||
| + | A name server which contains the complete data for a zone. | ||
| + | * The primary master DNS server: maintains the master copy of the zone data | ||
| + | * Slave DNS servers: (aka secondary servers) load the zone contents from another server using a replication process known as zone transfer. | ||
| + | == Non-authoritative Name Servers == | ||
| + | * Caching Name Server, or recursive name server | ||
| + | A name server which performs recursive lookups for local clients. Recursive name servers normally cache the results of the lookups they perform to improve performance. | ||
| + | * Forwarder | ||
| + | Some a caching name server may not perform the recursive lookup all by itself. It can forward some or all of the queries to another caching name server, commonly referred to as a forwarder. | ||
| + | |||
| + | |||
= Root Zone and Root Name Server = | = Root Zone and Root Name Server = | ||
* ftp://ftp.rs.internic.net/domain/ | * ftp://ftp.rs.internic.net/domain/ | ||
Revision as of 23:50, 2 June 2013
Contents
What is DNS (Domain Name System)?
- a hierarchical, distributed database
- for mapping Internet host names to IP addresses and vice versa
- provides mail routing information
What are the components in the DNS?
- DNS Clients
- resolver library
- DNS server
DNS clients (e.g. Web browser is one of those) look up information in the DNS by calling a resolver library, which sends queries to one or more name servers and interprets the response.
- Domains and Domain Names
- Zones
DNS Servers
Authoritative Name Servers
A name server which contains the complete data for a zone.
- The primary master DNS server: maintains the master copy of the zone data
- Slave DNS servers: (aka secondary servers) load the zone contents from another server using a replication process known as zone transfer.
Non-authoritative Name Servers
- Caching Name Server, or recursive name server
A name server which performs recursive lookups for local clients. Recursive name servers normally cache the results of the lookups they perform to improve performance.
- Forwarder
Some a caching name server may not perform the recursive lookup all by itself. It can forward some or all of the queries to another caching name server, commonly referred to as a forwarder.
Root Zone and Root Name Server
Root Name Servers
- named.cache or
- named.root
Root Zone
- root.zone and
- root.zone.gz (gzip of root.zone)
