Marco the four--dns of Linux learning notes

1.bind:berkeley Internet Name Domain

Dns:domian name Service Domain name resolution

2. Http

3.PAM plug-in authentication module

4.smtp/pop3/imap4:mail Server

5. Domain Name

Www.baidu.com This is a host name (fqdn,full qualified domain name, fully qualified domainname), COM is a domain name, baidu.com is also a domain name, domain name is a collection of many hosts.

Domain name after the resolution of a database, parsing is a query process. Domain name resolution is bidirectional, FQDN <--> IP

6. Caching

To reduce the traffic for DNS domain name resolution, use caching techniques to save information between the FQDN and the IP.