Monday, October 28, 2013

Web Development Techniques [HTML]

Network
         
              A network is E-interconnection of 2 or more devices

Internet
     
           -Internet is a network of networks which uses the standard protocol of TCP/IP ( Transmission Control Protocol / Internet Protocol )
Internet is just the connectivity of computers. But in order to make use of E-internet there should be services running on top of E-internet. The other services available in e-internet are Email,FTP, newsgroup,TelNet.

World Wide Web ( WWW )
       
          - WWW is e - most popular service available on e- internet.
          - A web page is a hypertext document created using html.
          - Collection of webpages is known as a website.
          - The web site is hosted in a special server called Webserver.
          - The web server is then connected to E-internet using TCP / IP protocol.
          - Once it is connected to E-internet users can access E-website using th client software called Web browser.
          - Like this there are many websites runing on top of a internet.
          - User's can naigate through hyperlinks from web page to another.
          - Since this is a Web os web sites it is called WWW.


When a web browser request a particular web page the request will go to the particular web server, the page is transfered across the internet to the web browser.The protocol which is used to transfer hypertext document ( web page) over the internet is know as Hyper Text Transfer Protocol ( http)  http is the standed protocol which is used in WWW.
WWW. is one of the classic example of client server model. The web server is serving the client which is E- web browser.


URL (Uniform Resource Locater)

              URL is used to locate a web page or resource available located in E-www.
http://esoft.lk/bit/sem3/www/introduction.html

Top level Dmain
 - 2 Types.
     + Country domain
              .lk,  .us, .uk  
     + Standard domain
              .com, .gov, .org, .mil, .edu  

URI ( Uniform Resource Identifier)
          URI is a string of character used to identify a name or a resource.

Domain Name system (DNS) server.
(1) Connect to the closet DNS server & check whethther the mapping IP Address for the Domain name requested.
(2) Returning E-IP Address of the requested domain name.





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