Modern day online users are used to symbolic addresses of web-sites, for example: yahoo.com or google.com. Certainly, these addresses and easier to write and they're memorized far better. The domain name system (DNS), which operates through these representational addresses, is so fused with the Internet that the vast majority of users don't even think it exists. Some familiar users remember about DNS only when it there are particular problems.

In the mean time, in addressing Websites there is used a particular numerical code, which is IP-address. The domain name is just utilized to perform conversions between character and numeric addresses. Traditional IP-address may be written making use of four numbers in decimal notation, for example: 192.168.175.13 or 194.85.92.93. DNS allows us to associate a numeric IP-address with characters, for example: 194.85.92.93 would much services.com. You would require a particular DNS guide to comprehend these things.

The symbolic address in DNS is a text string constructed by special guidelines. The most important of these rules is a hierarchy of domains. DNS address system has a tree construction. The nodes of the construction are called domains. Each domain may contain several sub domains. DNS tree may be split by levels: first, second, third and so forth. This starts with a single system of the root domain (zero). Interestingly, about the presence of the root domain is now remembered only by experts, due to the fact that the current DNS allows not specify the domain in the address bar.

It's not hard to estimate that addresses by utilizing DNS are written as a series, reflecting the hierarchy of names. The higher domains are written in the right part of the address bar. Domains are separated by dots. Let us take into consideration, for example, a string like www.site.services.com. There domain www is the 4th level, and others mentioned in this row are located in domains of the first level domain - com.

To convert the domains and IP-addresses in DNS, there's utilized a distributed system of special servers. Each server keeps a "set of customers", performing for them the address translation. Among the DNS servers there exists a hierarchy of "confidence" and distribution "areas of responsibility": a specific server can be responsible for a specific set of domains. These DNS-servers in the global Internet DNS system are connected and exchange information on rather complicated protocols. With an excellent DNS guide you may surely understand more.
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