Session no 2 For BZU

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Introduction of Web and Networking

Transcript of Session no 2 For BZU

  • Session No 2 The Internet and World Wide Web 11/27/13 Developed By: Saif Ullah Dar 1
  • Chapter 2 Objectives Discuss how the Internet works Define Webcasting Understand ways to access the Internet Describe the uses of electronic commerce (e-commerce) Identify a URL Identify the tools required for Web publishing Know how to search for information on the Web Describe the types of Web pages Explain how e-mail, FTP, newsgroups and message boards, mailing lists, chat rooms and instant messaging work Identify the rules of netiquette Next p. 2.2 Recognize how Web pages use graphics, animation,audio, video, and virtual reality 11/27/13 Developed By: Saif Ullah Dar 2
  • The Internet What is a network? A collection of computers and devices connected together via communications devices and media Modems Cables Telephone lines Satellites Next p. 2.2 11/27/13 Developed By: Saif Ullah Dar 3
  • The Internet What is the Internet? Also called the Net A worldwide collection of networks that links millions of businesses, government agencies, educational institutions, and individuals Next p. 2.2 11/27/13 Developed By: Saif Ullah Dar 4
  • The Internet What are some of the services found on the Internet? instant messaging e-mail Web message board chat file transfer Next p. 2.3 Fig. 2-1 11/27/13 Developed By: Saif Ullah Dar 5
  • History of the Internet How did the Internet originate? ARPANET Networking project by Pentagons Advanced Research Projects Agency (ARPA) Next p. 2.3 11/27/13 Goal: To allow scientists at different locations to share information and work together on military and scientific projects Goal: To function even if part of the network were disabled or destroyed Ullah Dar Developed By: Saif Became functional in September 1969 6
  • History of the Internet What is a host node? Next p. 2.4 University of California at Los Angeles Also called a host Any computer that Stanford directly connects to a Research network Institute Often stores and University of transfers data and California at messages Santa Barbara Provides network University of connections for other Utah computers Four original nodes on ARPANET 11/27/13 Developed By: Saif Ullah Dar 7
  • History of the Internet How has this network grown? Today More than 100 million host nodes 1984 More than 1,000 host nodes 1969 Four host nodes Next p. 2.4 11/27/13 Developed By: Saif Ullah Dar 8
  • History of the Internet What is NSFnet? The National Science Foundations network Five supercomputer centers Connected to ARPANET in 1986 NSFnet ARPANET The Internet Next p. 2.4 11/27/13 Developed By: Saif Ullah Dar 9
  • History of the Internet Who provides the structure for the Internet today? Networks from corporations, commercial firms, and other companies Telephone companies Satellite companies Cable companies Government Next p. 2.4 11/27/13 Developed By: Saif Ullah Dar 10
  • History of the Internet Who controls the Internet? The Internet is a public, cooperative, and independent network No single entity controls or owns the Internet Several organizations advise and define standards World Wide Web Consortium (W3C) Oversees research and Next p. 2.4 sets standards and guidelines 11/27/13 Internet2 (I2) Internet-related research and development project Develops and tests advanced Internet technologies Developed By: Saif Ullah Dar 11
  • Technology Trailblazer Tim Berners-Lee Created the World Wide Web Director of the World Wide Web Consortium (W3C) at MIT Click to view Web Link then click Tim Berners-Lee Next p. 2.4 11/27/13 Developed By: Saif Ullah Dar 12
  • How the Internet Works What is an Internet service provider (ISP)? A business that has a permanent Internet connection Provides temporary connections to individuals and companies for free or for a fee Next p. 2.5 11/27/13 Regional ISP Provides access to the Internet through one or more telephone numbers local to a specific geographic location National ISP Provides local telephone numbers in most major cities and towns nationwide May also provide a toll-free Developed By: Saif Ullah Dar number 13
  • How the Internet Works What is a point of presence (POP)? An access point on the Internet Next p. 2.5 11/27/13 Accessed by dialing a telephone number Select a service provider with at least one local POP telephone number Developed By: Saif Ullah Dar 14
  • How the Internet Works What are other service providers? Online Service Provider (OSP) Supplies Internet access Has many membersonly features that offer special content Wireless Service Provider Company that provides wireless Internet access Click to view Web Link then click Service Providers Next p. 2.5 11/27/13 Developed By: Saif Ullah Dar 15
  • Company on the Cutting Edge America Online Worlds leading online service provider Services include electronic mail, software, computer support services, Internet access Founded in 1985 by Stephen M. Case Click to view Web Link then click AOL Next p. 2.6 11/27/13 Developed By: Saif Ullah Dar 16
  • How the Internet Works What are ways to access the Internet? 1 Regional Internet Service 2 National Providers Internet POP Service 3 Online Providers Services POP Local POP 4 Wireless Online Service Internet (special Service members-only content) Provider 2 1 3 4 local call local call Next p. 2.5 Fig. 2-2 11/27/13 long-distance call Developed By: Saif Ullah Dar local call toll-free call toll-free call local 17 call
  • How the Internet Works How can you connect to the Internet? High speed connection Employees and students Computers part of a local area network (LAN) Connect to service provider through a high-speed connection line leased from local telephone company Dial-up access Home or small business Computer, modem, regular telephone line Dial into an ISP or OSP Newer high-speed technologies Home and small business Digital subscriber line (DSL) provides high-speed Internet Next p. 2.6 connections over regular copper telephone line Developed By: Saif Ullah Dar Cable11/27/13 modem- provides high-speed Internet connections through cable television network 18
  • How the Internet Works What are three parts of an Internet connection? Server Computer that manages the resources on a network Provides a centralized storage area for resources such as programs and data Also called a host computer Backbone Inner structure of the Internet Communications lines that carry the heaviest amount of traffic Client Computer that can access the contents of the storage area on the server Click to view Web Link then click Internet Backbone Next p. 2.6 11/27/13 Developed By: Saif Ullah Dar 19
  • How the Internet Works 1: You initiate an How might data travel the Internet using a telephone line action to request Regional 2: Aconnection? modem the data from converts 3: 4: 5: 6: 7: 8: the digital signals Internet. Data the computer from (request) travels through into analog signals, Data may pass to a telephone which are lines through one or local ISP. by understood The regional ISP more routers telephone lines. uses lines, leased before reaching its The national ISP from destination. final a telephone routes data across company, tofrom a Data moves send the country to a local dataserver retrieves national ISP to The to a national another national ISP.and then to a ISP the requested data ISP. destinationit back and sends server. through the Internet backbone to your computer. Step 1 ISP Step 5 Step 2 Step 4 National ISP Local ISP Step 6 Internet backbone Step 8 Step 7 Next p. 2.7 Fig. 2-3 Step 3 11/27/13 Developed By: Saif Ullah Dar 20 National ISP
  • How the Internet Works What is an Internet protocol (IP) address? Number that uniquely identifies each computer or device connected to the Internet Four groups of numbers, each separated by a period Number in each group is between 0 and 255 IP address 199.95.72.10 last part identifies specific computer first part identifies network Next p. 2.8 Fig. 2-4 11/27/13 Developed By: Saif Ullah Dar 21
  • How the Internet Works What is a domain name? Text version of an IP address Components are separated by periods Each domain name represents one or more IP addresses IP address Domain name 199.95.72.10 www.scsite.com Next p. 2.8 Fig. 2-4 11/27/13 Developed By: Saif Ullah Dar 22
  • How the Internet Works What is a top-level domain (TLD) abbreviation? Identifie