Search online through dns lookup

By Travis Sosa

The dns lookup stands for the process or the way the net follows when a user asks for some site by typing it on the address bar. The dns lookup refers towards the search in the domain name in the certain web site. For example when the user gives the site name as Google, from its domain name (i.e. Google) the net searches the net and come across the IP address attached to it. In this way, the web is in a position to give the user his or her necessary website.

The step involves transfer of series of messages between the computer and the internet service provider and also between the internet service provider and the root server. The first step of the dns lookup system begins when the user types the domain name for the website on the URL bar. The computer checks for the domain name through caches weather it has been earlier visited by the user earlier or not. If the site has been visited, the caches help the computer in opening that site. But if the caches don't have the history of the website the dns lookup begins for the asked website.

Mechanism of dns lookup
The dns lookup requires the web service provider as well as the root server. The laptop asks the world wide web service provider to lookup for the web-site that has been asked by the user. The internet service provider in turn asks the root server to look for the IP Address from the domain extension and assist in exactly where to hunt for the site.

After the root server has informed about the IP address of the domain extension, the ISP checks for the whole domain using the assist in the root server that is also named recursive name server resulting from its functions. The authoritative name server then assists the world wide web service offer to look up for the whole domain on the given domain extension.

The name of the authoritative server is given due t its function as it helps the ISP in reaching the end tail. This way the ISP reaches the webpage that has been requested by the end user. For speeding up the entire process, there are caches placed at every level that help the ISP to reach the IP address directly without the help of root servers. The dns lookup helps the ISP if the user visits the site frequently or has opened the site in near future. The caches remember the routes that have been followed by the computer for the site earlier and the ISP directly routes to the website.

Loopholes within the dns lookup
If there is a hat within the dns lookup process, the complete machine halts or the firewall crashes. The dns lookup method crashes and due to this it takes a extended time for the search as well as decreased efficiency is yet another trouble. One of the prevalent difficulties with dns lookup is faulty delegations within the dns sub domain which once again outcomes into reduced efficiency and speed with the world wide web.

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