Sunday, January 02, 2005

Three DNS Server Configuration Roles

There are three DNS server configuration roles:
  • Caching-only server
  • Primary server
  • Secondary server

A single DNS server can play multiple roles.

All DNS servers maintain a cache.dns file that contains a list of all Internet root server. Any time a DNS server resolves a hostname to an IP address, the info is added to the cache file.

Caching-only server. Caching-only servers do not contain any zone info. The main purpose of a caching-only server (other than providing name resolution) is to build the cache file as names are resolved. So either hostnames are resolved from the cache or else another DNS server is required to resolve them. Caching-only servers are useful when there are remote locations that have slow-WAN links.

Primary server. A primary DNS server hosts a working (writable) copy of a zone file. A single DNS server can be the primary DNS server for multiple zones.

Secondary server. A secondary DNS server gets its zone info from a master DNS server. The secondary DNS server hosts a read-only copy of the zone file, which it gets from the primary server or another secondary server. Both Win2k and Win2003 support incremental zone transfers. A server can be both a primary and a secondary server at the same time. Secondary servers provide the following benefits:

  • Fault tolerance
  • Reduction in name-resolution traffic
  • Load balancing

Notes are taken from the following book

Implementing, Managing, and Maintaining a Windows Server 2003 Network Infrastructure

5 Comments:

At 10:15 AM, Anonymous Anonymous said...

There are also derivatives of primary and secondary servers. A common one is the blind primary, in which the primary owns the writable zone file, however, the secondary is listed in the zone file as the SOA and primary NS. This is useful if you want to have your ISP host DNS traffic, but, you want to administer the zone file on your corporate DNS server. This avoids having to go through your ISP's hostmaster to make zone file changes. It also obscures where the zone file lives (which is not overly useful).

 
At 5:13 PM, Blogger ninest123 said...

louis vuitton outlet, ugg boots, ray ban sunglasses, oakley sunglasses, louis vuitton outlet, longchamp pas cher, prada outlet, polo ralph lauren outlet, nike outlet, chanel handbags, louboutin outlet, longchamp outlet, louis vuitton, nike air max, cheap oakley sunglasses, longchamp outlet, jordan shoes, louis vuitton, nike free, tiffany and co, tory burch outlet, prada handbags, replica watches, nike roshe run, longchamp, louboutin, air max, ralph lauren pas cher, christian louboutin outlet, replica watches, louis vuitton, nike air max, kate spade outlet, louboutin pas cher, nike free, oakley sunglasses, sac longchamp, oakley sunglasses, polo ralph lauren outlet, louboutin shoes, uggs on sale, ray ban sunglasses, ray ban sunglasses, burberry, gucci outlet, oakley sunglasses, tiffany jewelry, ugg boots, air jordan pas cher, michael kors

 
At 5:15 PM, Blogger ninest123 said...

coach outlet, ugg boots, vans pas cher, michael kors, hollister, coach purses, nike air max, ray ban uk, sac guess, ray ban pas cher, mulberry, true religion outlet, hermes, michael kors outlet, oakley pas cher, true religion jeans, lacoste pas cher, ugg boots, michael kors outlet, michael kors outlet, true religion jeans, nike free run uk, tn pas cher, michael kors, nike air max, burberry, vanessa bruno, lululemon, nike roshe, nike air max, ralph lauren uk, coach outlet, north face, replica handbags, nike blazer, converse pas cher, michael kors outlet, timberland, michael kors, abercrombie and fitch, hollister pas cher, true religion jeans, air force, burberry outlet online, michael kors, michael kors outlet, new balance pas cher, north face, kate spade handbags, hogan

 
At 5:17 PM, Blogger ninest123 said...

mont blanc, nike air max, babyliss, mcm handbags, louboutin, herve leger, ghd, hollister, celine handbags, lancel, new balance, nike trainers, valentino shoes, nfl jerseys, reebok shoes, soccer shoes, oakley, vans shoes, p90x workout, soccer jerseys, nike huarache, converse outlet, nike roshe, abercrombie and fitch, bottega veneta, north face outlet, beats by dre, birkin bag, instyler, gucci, mac cosmetics, chi flat iron, ferragamo shoes, insanity workout, ralph lauren, nike air max, jimmy choo shoes, longchamp, wedding dresses, asics running shoes, vans, hollister, timberland boots, iphone cases, baseball bats, hollister, giuseppe zanotti, north face outlet, ray ban, lululemon

 
At 5:19 PM, Blogger ninest123 said...

montre pas cher, moncler outlet, moncler, karen millen, moncler, supra shoes, ugg pas cher, wedding dresses, swarovski, moncler, sac louis vuitton pas cher, doudoune canada goose, moncler, louis vuitton, pandora charms, canada goose, ugg,uggs,uggs canada, swarovski crystal, marc jacobs, hollister, moncler, toms shoes, louis vuitton, ugg boots uk, louis vuitton, canada goose uk, coach outlet, louis vuitton, moncler, canada goose, pandora charms, links of london, moncler, canada goose, canada goose outlet, pandora jewelry, juicy couture outlet, canada goose, thomas sabo, juicy couture outlet, pandora jewelry, bottes ugg, canada goose outlet, ugg,ugg australia,ugg italia, replica watches

 

Post a Comment

<< Home