DNS "Domain Name System" ~ InfoTech

The Domain Name System (DNS) is a hierarchical decentralized naming system for computers,

services, or other resources connected to the Internet or a private network. It associates various

information with domain names assigned to each of the participating entities to help direct

traffic.Some people call DNS the "phone book of the Internet."

Why Do We Have DNS Servers?

This question can be answered with another important question too: Is it easier to remember 216.58.198.174 or www.google.com ? Most of us would say it's much simpler to remember a word like about instead of a string of numbers.

When you enter www.google.com into a web browser, that's all you have to understand and remember, is the URL http://www.google.com. The same is true for any other website like Facebook.com, Amazon.com, Youtube.com etc.

The opposite is right too, that while we as humans can understand the words in the URL much better than the IP address numbers, other computers and network devices understand the IP address.

Therefore, we have DNS servers because we not only want to use human-readable names to access websites, but the computers need to use IP addresses to access websites. The DNS server is that translator between the hostname and IP address.

DNS records

This list of DNS record types is an overview of resource records (RRs) permissible in zone files of the Domain Name System (DNS). It also contains pseudo-RRs. This is some common DNS recods:

DNS verification

To verify DNS status nslookup command CMD is used to query your DNS server. In the first

example below, the command tells you the IP address while the second example is used to find the

hostname if all you have is the IP address:

> nslookup google.com

Server : google.com

Address: 216.58.198.174

About Rachad Mouhssine

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