A comprehensive explanation of the DNS and the nature of its work and its role

A comprehensive explanation of the DNS and the nature of its work and its role

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In this lesson we will provide a comprehensive explanation of DNS, what DNS is and how it works and its role in the web

Domain Name System (DNS) A shortcut to the Domain Name System is responsible for reading the links. For example, the Google domain name is google.com. When you visit the site, the domain name will be typed in the address box in the browser. Unfortunately, the computer does not have a mechanism to understand text domains He can not easily find google.com in the Internet because dealing with numbers is much easier than dealing with text in searches and indexing. The Google site is located on IP address 173.194.39.78 which is the title of the Google website

Where the computer stores the responses of DNS requests to be requested every time they are connected to Google When the computer determines the IP number associated with the name of the URL will remember this address for a specified period of time, which helps to accelerate the browsing by skipping DNS request stage, You can also increase protection and security by using a DNS that blocks unsafe websites.

The technique of this system is similar to the regular telephone directory where we write the names of the people we call with their phone numbers. When we want to contact someone, we only open the directory on the page that contains the person's name and then read the person's number and contact. For the Internet, the KLO method between devices is directly dependent on the IP address. This address is composed of 32 binary boxes in IP Version 4, which can be represented as follows (208.77.188.166) With a note that it is written in decimal system. A 128 binary box in the sixth version (IP Version 6) can be represented as follows (2001: db8: 1f70: 999: de8: 7648: 6e8) .LLL with a note that it is written in hexadecimal .

When the device wants to communicate with another device, it must know the digital address of the device to exchange data with. Before using DNS, the process of creating device-defined names was done through files called Host File, but with the number of devices included in the network, and the DNS system was designed to replace the Host files with a non-descriptively distributed Distributed Database In addition to improving performance by using a hierarchical structure to define domain domain elements, the DNS service provides translation of the names used to denote the domain elements to the corresponding IP addresses, since the use of meaningful names is easier than using IP addresses. This system can therefore be defined as a decentralized (distributed) information base on the Internet containing domain information, device names and digital addresses under each domain. This system divides network information into locally managed parts and access them via the network.

Source: wikipedia

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