CHAPTER 14 · Part 2

browser sends a request to the web page and web server using HTTP protocol. . The web server receives request using HTTP protocol and checks for the requested web page. If found returns back to the web browser and closes the HTTP connection. . Now the web browser receives the web page, it interprets and displays the contents of web page in web browser’s window. Internet • Internet is a world-wide global system of interconnected computer networks. • Internet uses the standard Internet Protocol (TCP/IP). • Every computer in internet is identified by a unique IP address. • IP Address is a unique set of numbers (such as . . . ) which identifies a computer location. • A special computer DNS (Domain Name Server) is used to give name to the IP Address so that the user can locate a computer by a name. • Internet is accessible to every user all over the world. Evolution • The origin of Internet is devised from the concept of Advanced Research Project Agency Network (ARPANET). Advantages • Internet allows us to communicate with the people sitting at remote locations. There are various apps available on the web that uses Internet as a medium for communication. One can find various social networking sites such as: • Facebook • Twitter • Yahoo • Google+ • Flickr • Orkut • One can surf for any kind of information over the internet with the help of a search engine. • Apart from communication and source of information, internet also serves as a medium for entertainment. Following are the various modes for entertainment over internet. • Online Television • Online Games • Songs • Videos • Social Networking Apps • Internet allows us to use many services like: • Internet Banking • Online Educational Services • Online Shopping • Online Ticket Booking • Online Bill Payment • Data Sharing • E-mail • Internet provides concept of electronic commerce, that allows the business deals to be conducted on electronic systems Topology: Topology describes the physical cabling layout and the logical way of moving data between components. . . Network