Domain Name System examples

You can use these examples to understand how to use Domain Name System (DNS) in your network.

DNS is a distributed database system for managing host names and their associated IP addresses. The following examples help to explain how DNS works, and how you can use it in your network. The examples describe the setup and reasons it will be used. They also link to related concepts that you might find useful to understand the pictures.

• Example: Single Domain Name System server for an intranet
  This example depicts a simple subnet with a Domain Name System (DNS) server for internal use.
• Example: Single Domain Name System server with Internet access
  This example depicts a simple subnet with a Domain Name System (DNS) server connected directly to the Internet.
• Example: Domain Name System and Dynamic Host Configuration Protocol on the same iSeries server
  This example depicts Domain Name System (DNS) and Dynamic Host Configuration Protocol (DHCP) on the same server.
• Example: Split Domain Name System over firewall
  This example depicts Domain Name System (DNS) operating over a firewall to protect internal data from the Internet, while allowing internal users to access data on the Internet.