Introduction to the DNS Domain Name System

I. Introduction of DNS Domain Name System

1, in order to distinguish each host in the network, each host must be assigned a unique address, which is called the "IP address." But these numbers are hard to remember, so use the "domain name" approach to replace these numbers.

2, when a host to communicate with other hosts, you can use the host name to the DNS server to query the IP address of the host, the entire DNS domain Name system is composed of the following four parts. 1.DNS Domain name Space 2. Resource record 3. DNS server 4.DNS client 3, root domain-top level domain (com/cn/edu/net)--Two level domain (com/redheadheater)--Subdomain (Cctv/sina)--Host (www/news/m AIL)

Introduction to the DNS Domain Name System