Introduction
In this post we will cover:
- Stub resolver
- Preferred name server and alternate name server
- Full service resolver and content server
- Root server
Stub resolver
Client software that makes a request to a name server. When the stub resolver queries the name server for a domain, the domain is usually specified by the FQDN. If only the host name is specified, the stub resolver completes the domain name to create the FQDN. The path completed at this time is called a search path, which is usually the domain to which the host itself belongs.
Preferred name server and alternate name server
Two or more name servers are usually set from the viewpoint of fault tolerance. In addition to registering multiple name servers in the stabilizer , specify the name server that normally inquires ( priority name server ) and the name server that inquires when the preferred name server goes down ( alternative name server ). There may be inconsistencies in cached information (such as not reflecting IP address changes) between multiple name servers. At this time, “whether the name server has the latest cache” and…
