For this reason, so-called domain

[israt9623525]

234.123.234. This sequence of numbers is the IP , that is, the code that uniquely identifies each computer on a network, and if this is the Internet, on the Web. Be sure that there will be only one computer in the congo-brazzaville business email list world that will have that IP. Obviously, remembering every site with a 12 (if not more) digit number is quite complex; names are used , that is, those that we type into the browser ( for example: www.ueppy.com ). To see a site, therefore, we do not write the number but the name: www.


sitename.com . When we do this, an interpreter will translate that name, understandable to humans, into an IP code, understandable by computers. This interpreter is precisely the DNS. It may happen that you move a site from one computer to another: in this case, through appropriate procedures, you will change the IP and when you type the name of the site, the DNS will know that the computer where it will reside has a new IP. Where is this name changed? On global DNS servers, called authoritative . You can understand how these servers could be overloaded: to avoid this load, other DNS servers are used that are always reachable on the network, which, at each change, are updated in a successive way (an operation that is called " DNS propagation "); to speed things up even further, every single computer, including yours, has a DNS cache so that if we return to a site we do not waste time having the IP translated again from the domain name.