Tiêu đề Linux Chapter X-DNS Server.pdf ✅

DNS SERVER CONFIGURATION
● We are going to use Centos 8 and Configure Apache web-server for this demonstration. Platform
 IP address are tough for human to remember and impossible to guess. DNS are usually used to translate a hostname or Domain name (eg. ncit.edu.np) into an IP address (eg. 208.91.198.170).  Domain name comprise a hierarchy so that names are unique, yet easy to remember.  Secondly, should an IP address for a host change, the domain name can still resolve transparently to the users or application. DNS name resolution is a critical Internet service. Many network services require functional name service for correct operation.  Domain names are separated by dots with the topmost element on the right. What is DNS (Domain Name System)
 Root Name Servers ○ The top of DNS hierarchy is the root domain. The root domain does not have a formal name and its label in the DNS hierarchy is an empty string. ○ It returns Mapping to Local Name Server. ○ The root domain contains all top-level domains of the Internet.  Top Level Domain Servers ○ Responsible for com, org, net. ○ All top level Country domains like us, uk, fr, np, in.  Authoritative Domain Servers ○ Organization’s DNS Servers. Domain Name System : Types