Original subtitles

Domain Name System or DNS essentially converts names or what are called

domain names such as Faceboook.com to IP Addresses that are understood

by computers and other devices that make up a network

As an example if you’ll go to a website such as Google.com

that name is being converted to an IP Address that allows your traffic

or data to be routed on the local network or even across the Internet

So as an example if I ping facebook.com ping is a protocol that allows

you to test connectivity on a network so once again ping www.facebook.com

you’ll notice that the name facebook.com is resolved to an IP Address

Ping google.com that name or Domain name is resolved to an IP Address

that’s unique to Google.com.I am in the UK so if I ping google.co.uk

notice that’s resolved to a different IP Address

Don’t worry too much about the formatting of IP Addresses at the moment;

we’ll talk more about IP Addressing in a lot more detail later

Ping cnn.com, what I want you to notice here is that each name is resolved

to a separate IP Address that’s unique and different

You could as an example connect to IP Addresses directly but

it’s a lot easier to use human readable names such as Google.com

or Google.co.uk or CNN.com rather than having to remember

IP Addresses of individual sites

So in summary Domain Name System or DNS is a way to resolved Domain names

to IP Addresses so that your traffic can be routed through the Internet

Typically when you connect to a network you’ll be allocated

a Domain Name Systems Server or DNS Server

You can configure them manually and here are some examples of some

Public DNS Servers that you could configure your PC to use

One of the famous ones is Google Public DNS Servers 8.8.8.8 and 8.8.4.4.

In control panel on my Windows machine I could look at the configuration

of my Local Area Connection or Local Network Interface

and under details you’ll see that I have 2 DNS servers configured,

Google as well as my local Internet router at home.