365edu: What is DNS. . .

Networking Topics

o	Introduction Networking
o	Introduction Network Communication Devices
o	Introduction to Network Security
o	Overview of Computer Network Topology
o	Introduction To Certifications
o	What is Ethernet ?
o	Router Commands Overview
o	IP Commands
o	WAN Configurations Commands
o	How to connect two computers wirelessly
o	Introduction to ISDN Line
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o	What is a Web Server?
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o	What is a Internet Fax
o	What is GSM ?
o	What is Network Routing
o	Software Configuration
o	An Overview of the Wireless Networking
o	Introduction to PC Components
o	Introduction to Mobile Technology and Communication Reviews
o	Introduction to Switched Network
o	ATM Network Technology
o	Networking Methods
o	What is DNS
o	IP routing and root servers
o	DHCP Overview
o	Introduction to Network Cables
o	IP Addressing
o	How to Recover the Lost Files?
o	What is Web Conferencing
o	Setting up Print Server in Windows 2000 ?
o	Client Computer Configuration
o	Windows 2000 Server Installation Overview
o	What is a Proxy Server?

What is DNS

You will learn about the dns server configurations and overview, ip addressing, subnetting, domains description, how ip works. Domain name service is an Internet service that translates domain names into IP addresses. Domain names are easy to remember because they are alphabetic. On the other end, the internet is based on the IP addresses i.e every computer on the internet is associated with a unique IP address.

The communication on the internet is carried out on the basis of IP addresses and not on the domain names. A Domain name server service translates the domain name into its corresponding IP address for example the domain name www.abc.com might be translated to 102.222.34.56. The DNS system is, in fact, forms its own network.

If one Domain name serverserve doesn’t know to translate a domain name, it looks for another one and so on until the exact IP address is returned. DNS translates between the internet names and internet addresses.

How DNS Works

DNS organizes the hostnames in the form of hierarchy. A domain is a collection of of the sites that are related because they form a network (all computers that are geographically close as well. Universities are commonly grouped in .edu domain with each university or college using a separate sub domain.

While most of the topic does not require much technical knowledge, there is one technical part of the Domain name server.

When you type a name like example.com in your internet browsers it finds a way to map that name to the internet IP numbers, by which the internet easily reach the example.com computer. For this purpose your computer uses DNS of your Internet service provider company. All internet traffic work on these numbers and the important factor is that the looking up for the name is done by Domain name server.

That computer has a list of the host names/IP address mapping, which is regularly updated by the root DNS. Root DNS servers are the master servers that can help you look up any name. All the root DNS servers copy their own data from the one master server, which is under the control of ICANN. The root servers usually have a list that where you can look for the top level domains like .com, .net, org and .info etc. The ISP sends request for the particular domain name to the root sever and root server directs the request to the master server. In this way, you get the answer with your requested domain name.