This module will explore DNS and use the program nslookup to probe the DNS
program is free software, available under all UNIX versions as well as Windows.
It generates name server
queries on command, and is useful for debugging DNS.
- DNS: Domain Name Service (DNS) is an Internet-wide service for converting numeric IP addresses to host names and back.
- name server: A name server is a process that accepts queries into the DNS database. It is also fairly common usage to refer to the computer on which this process is running as a name server.
By the end of this module, you will be able to:
Domain Name System (DNS) translates between domain names and IP addresses, and is supported by nearly every operating system. All Internetbased
name resolution utilizes DNS. DNS is organized as a hierarchy. Consider the following translation: