1. Domain Name System The Technology Context Presentation

2. Introduction Domain Name System (DNS) enables you to use hierarchical, friendly names to easily locate computers and other resources on an IP network. DNS is a distributed database that contains mappings of DNS domain names to data. Both the Hosts file and DNS use a namespace. DNS replaces the Hosts file with a distributed database that implements a hierarchical naming system

3. Three Main Components Of DNS Domain Name Server. Domain Name Resolvers. Domain Name Space

4. Domain Name Server A Domain Name Server is a computer that runs a DNS server application. That server can store zone file information locally or in memory. A DNS server responds to client requests for name resolution by trying to find those names (and associated IP addresses) in name space. A name server also performs database management tasks on the zone files, Such as resource record updates and zone transfers.

5. Tree Diagram

6. Domain Name Resolver A resolver is a Domain Name System client. Resolvers can be TCP/IP workstation or servers, but must be configured to send name resolution request to the IP addresses of at least one DNS server. Most desktop computers in a Domain Name System environment are resolvers.

7. Domain Name Space The Name space is one of the most important part of any name system, since it tells us that how the names are created. The Name space tells us that what form names can take, and provides the rules for how they are created. DNS Name space works much like a group of separately managed databases housed on different systems, all of which are able to find and use one another’s entries. Name space consists of a large number of name servers, called systems; they are logically connected in parent- child fashion. While each system may only be responsible for a small area of name space, host names from other systems can be referenced in response to client requests.

8. Legislation The operation of the Domain Name System is not affected by any legislation in the UK It is an international group of company that are responsible of running Domain Name System server that acts on Domain Name System Issues. They can be influenced by British law, but it plays only a small role.

9. Limitation There are almost unlimited numbers of IP address certainly, there are some limits in IP version 4 about 4 billion IP unique addresses because it uses 32-bites in every address, but with IP version 6 we have resources which enable to give every individual on the planet, nearly you can say 10 billion IP addresses as it uses 128 bites for every address. Mathematically this is a limit resource, but practically it’s an unlimited resource. IP address is allocated at the moment on the basics of demonstrated immediate demand.

10. Conclusion Domain Name System is an important invention for people because everyone cannot remember the IP addresses for every web pages and the population is increasing, business are increasing so there by websites are increasing so there by its very difficult to remember the IP addresses DNS make life easier and it is faster, more reliable and safer.

11. References Blank, A.G. (2002). //TCP/IP JumpStart//. USA: SYBEX. Wales, J. (2003). //Domain Name System//. Available:http://en.wikipedia.org/wiki/Domain_Name_ System. Last accessed 29/11/2011.http://en.wikipedia.org/wiki/Domain_Name_ System Domain Name Services, 2008, online video, accessed 03 December 2011, Domain Name System (DNS) How it works, 2008, online video, assessed 03 December 2011, http://www.youtube.com/watch?v=9RhOSxZ1WJkhttp://www.youtube.com/watch?v=eX7Yt_fxAfU