Home | Computer
Domain Name System is a service that translates domain names into IP addresses. Because domain names are alphabetic, they're easier to remember. The Internet however, is really based on IP addresses. Every time you use a domain name, therefore, a DNS service must translate the name into the corresponding IP address. It is a system for converting host names and domain names into IP addresses on the Internet or on local networks that use the TCP/IP protocol. The DNS system is, in fact, its own network. If one DNS server doesn't know how to translate a particular domain name, it asks another one, and so on, until the correct IP address is returned. The DNS database resides on a hierarchy of special database servers. When clients like Web browsers issue requests involving Internet host names, a piece of software called the DNS resolver usually built into the network operating system first contacts a DNS server to determine the server's IP address. If the DNS server does not contain the needed mapping, it will in turn forward the request to a different DNS server at the next higher level in the hierarchy. After potentially several forwarding and delegation messages are sent within the DNS hierarchy, the IP address for the given host eventually arrives at the resolver, that in turn completes the request over Internet Protocol. Domain Names: The domain name space consists of a tree of domain names. Each node or leaf in the tree has one or more resource records, which hold information associated with the domain name. The tree sub-divides into zones. A zone consists of a collection of connected nodes authoritatively served by an authoritative DNS name server. Domain names have at least two parts, separated by a dot or period. The rightmost part after the dot is called the Top Level Domain. The Top Level Domain serves to broadly categorize the name as to its type or purpose. Common TLDs include: .com Commercial organization worldwide .com .org .edu .org Organizations worldwide, .edu US educational institutions, .net US networks, Public service, state-run offices in general .gov U.S. government .mil U.S. military. .int International organizations. There are also hundreds of country TLDs, such as: .in India .uk UK, .us USA, .fr France, .de Germany, etc The Domain Name System consists of a hierarchical set of DNS servers. Each domain or sub domain has one or more authoritative DNS servers that publish information about that domain and the name servers of any domains "beneath" it. The hierarchy of authoritative DNS servers matches the hierarchy of domains. At the top of the hierarchy stand the root name servers: the servers to query when looking up a top-level domain name. A resolver looks up the resource record information associated with nodes. A resolver knows how to communicate with name servers by sending DNS queries and heeding DNS responses. A DNS query may be either a recursive query or a non-recursive query. A non-recursive query is one where the DNS server may provide a partial answer to the query or give an error. DNS servers must support non-recursive queries. A recursive query is one where the DNS server will fully answer the query DNS servers are not required to support recursive queries. That should really boost your knowledge about the domain name system and how it works.
Article Source: http://www.phalenes.org/articles
You can download a free trial of the free registry cleaner from Mehmet website. He shares some of his things he learned in 10 years experience.
Please Rate this Article
5 out of 54 out of 53 out of 52 out of 51 out of 5
Not yet Rated
