lecture 5
TRANSCRIPT
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Chapter 3: The Internet and World Wide Web: E-commerce
Infrastructure
Copyright © 2007 Pearson Education, Inc. Slide 1-1
Chapter 3
The Internet and World Wide Web: E-commerce Infrastructure
Copyright © 2011 Pearson Education, Inc.
Teaching Objectives Discuss the origins of the Internet. Identify the key technology concepts behind the Internet. Describe the role of Internet protocols and utility programs. Explain the current structure of the Internet. Explain the limitations of today’s Internet. Describe the potential capabilities of Internet II. Explain how the World Wide Web works. Describe how Internet and Web features and services support
e-commerce.
Copyright © 2010 Pearson Education, Inc. Slide 1-2
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The Internet: Technology Background
Internet Interconnected network of thousands of networks and millions
of computers
Links businesses, educational institutions, government agencies, and individuals
World Wide Web (Web) One of the Internet’s most popular services
Provides access to around billions, possibly trillions, of Web pages
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The Evolution of the Internet1961—The Present
Innovation Phase, 1964–1974 Creation of fundamental building blocks
Institutionalization Phase, 1975–1994 Large institutions provide funding and legitimization
Commercialization Phase,1995–present Private corporations take over, expand Internet backbone and local
service
2002_0918_Internet_History_and_Growth.ppt
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Source: http://www.glossar.de/glossar/1frame.htm?
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The Internet: Key Technology Concepts
Defined by Federal Networking Commission as network that:
Uses IP addressing Supports TCP/IP Provides services to users, in manner similar to telephone system
Three important concepts:1. Packet switching
2. TCP/IP communications protocol
3. Client/server computing
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Circuit switching
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Source: http://www.highteck.net/EN/Basic/Internetworking.html
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Packet Switching
Slices digital messages into packets
Sends packets along different communication paths as they become available
Reassembles packets once they arrive at destination
Uses routers Special purpose computers that interconnect the computer networks that
make up the Internet and route packets Routing algorithms ensure packets take the best available path toward their
destination
Less expensive, wasteful than circuit-switching
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Packet SwitchingFigure 3.3, Page 130
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Packet Switching Demo http://www.pbs.org/opb/nerds2.0.1/geek_glossary/packet_switching_flash.html
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TCP/IP
Transmission Control Protocol (TCP): Establishes connections between sending and receiving Web
computers Handles assembly of packets at point of transmission, and
reassembly at receiving end
Internet Protocol (IP): Provides the Internet’s addressing scheme
Four TCP/IP Layers (hourglass model) 1. Network Interface Layer2. Internet Layer3. Transport Layer4. Application Layer
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The TCP/IP Architecture and Protocol Suite
Figure 3.4, Page 132
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Routing Internet Messages: TCP/IP and Packet Switching
Figure 3.5, Page 133
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Internet (IP) Addresses IPv4:
32-bit number
Expressed as series of four sets of separate numbers marked off by periods
201.61.186.227 or 130.111.67.244
Class B address: Network identified by first two sets, computer identified by last set
Class C address: Network identified by first three sets, computer identified by last set
New version: IPv6 has 128-bit addresses, able to handle up to 1 quadrillion addresses (IPv4 can only handle 4 billion)
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Checking your IP
From start menu, type cmd in search box Under programs, click on cmd Type ipconfig
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Domain Names, DNS, and URLs
Domain Name IP address expressed in natural language
Tonyg.umfk.maine.edu 130.111.66.37
Domain Name System (DNS) Allows numeric IP addresses to be expressed in natural language
Uniform Resource Locator (URL) Address used by Web browser to identify location of content on the
Web E.g., http://www.azimuth-interactive.com/flash_test
Protocol/server/file
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How to Pick a Domain Name Pointers for picking domain names
If you sell bricks, pick a domain name containing a word like brick Consider name length and ease of remembering the name Hyphens to force search engines to see keywords in your domain
name custom-bricks.com Make sure the domain name is easy for Web users to remember and
find The domain name should suggest the nature of your product or
service The domain name should serve as a trademark The domain name should be free of legal conflicts
1-19© 2007 Prentice-Hall, Inc
Some memorable Internet names
Good names Amazon.com Ebay.com Yahoo.com Google.com Alibaba.com Hotmail.com qwerty.com Dropbox.com
Bad names Yadayada.com Doggles.com ePet.com Teacherstalk.com “anything”online.com llanfairpwllgwyngyllgogerychwyrndrob
wyll-llantysiliogogogoch.com thelongestlistofthelongeststuffatthelon
gestdomainnameatlonglast.com Close to an existing name
Gooogle.com Goggle.com
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How to Register a Domain Name
Check if the domain name you propose has been taken
www.FasterWhois.com http://www.networksolutions.com/whois/index.jsp
One of the most popular and reliable registration information sites is www.internic.net
I use www.godaddy.com and www.networksolutions.com
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Client/Server Computing
Powerful personal computers (clients) connected in network with one or more servers
Servers perform common functions for the clients Storing files, software applications, etc.
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Client Server
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The New Client: The Emerging Mobile Platform
Within a few years, primary Internet access will be through:Netbooks & Tablets
Designed to connect to wireless Internet Under 2 lb, solid state memory, 8” displays $200-400 $200 for Kindle Fire, $500-800 for iPad2
Smartphones Disruptive technology: Processors, operating systems
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Cloud Computing
Firms and individuals obtain computing power and software over Internet E.g., Google Apps
Fastest growing form of computing Radically reduces costs of:
Building and operating Web sites Infrastructure, IT support Hardware, software
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Other Internet Protocols and Utility Programs
Internet protocols HTTP E-mail: SMTP, POP3, IMAP FTP, Telnet, SSL
Utility programs Ping Tracert Pathping
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The Internet Today
Internet growth has boomed without disruption because of:Client/server computing model Hourglass, layered architecture
Network Technology Substrate Transport Services and Representation Standards Middleware Services Applications
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The Hourglass Model of the InternetFigure 3.11, Page 144
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SOURCE: Adapted from Computer Science and Telecommunications Board (CSTB), 2000.
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Internet Network Architecture
Backbone: High-bandwidth fiber-optic cable networks Private networks owned by a variety of NSPs Bandwidth: 155 Mbps – 2.5 Gbps Built-in redundancy
IXPs: Hubs where backbones intersect with regional and local networks, and backbone owners connect with one another
CANs: LANs operating within a single organization that leases Internet access directly from regional or national carrier
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http://www.nthelp.com/maps.htm
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Internet Network ArchitectureFigure 3.12, Page 145
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Internet Service Providers (ISPs)
Provide lowest level of service to individuals, small businesses, some institutions
Types of serviceNarrowband (dial-up)
Broadband Digital Subscriber Line (DSL)
Cable modem
T1 and T3
Satellite
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Intranets and Extranets
IntranetTCP/IP network located within a single
organization for communications and processing
ExtranetFormed when firms permit outsiders to
access their internal TCP/IP networks
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Intranet – components
Intranet Benefits:
E - commerce Customer service Search & access data Customize information Share information Enforce group decision making Empower Virtual organization Share software Managing data Training
Extranet
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Extranet –Extranet Applications
Extranet - Benefits
Manufacturing cost reduction
Strength communication
Expanse business opportunities
East to exchange information among
business partners
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Who Governs the Internet?
Organizations that influence the Internet and monitor its operations include: Internet Architecture Board (IAB) Internet Corporation for Assigned Names and Numbers (ICANN) Internet Engineering Steering Group (IESG) Internet Engineering Task Force (IETF) Internet Society (ISOC) World Wide Web Consortium (W3C) International Telecommunications Union (ITU) More information @ http://www.isoc.org/standards/
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Insight on Society
Government Regulation and Surveillance of the Internet
Class Discussion
How is it possible for any government to “control” or censor the Web?
Does the Chinese government, or the U.S. government, have the right to censor content on the Web?
How should U.S. companies deal with governments that want to censor content?
What would happen to e-commerce if the existing Web split into a different Web for each country?
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Fiber Optics and the Bandwidth Explosion in the
First Mile “First mile”: Backbone Internet services that carry
bulk traffic over long distances Older transmission lines being replaced with fiber-
optic cable
Much of fiber-optic cable laid in United States is “dark”, but represents a vast digital highway that can be utilized in the future Technology improvement has expanded capacity of
existing fiber lines
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Optical Fiber
Source: Adapted from Panko, Raymond, Business Data Communications and Networking (3rd ed.), Upper Saddle River, NJ: Prentice-Hall, 2001, p. 278.
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Optical Fiber
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The Last Mile: Mobile Wireless Internet Access
“Last mile”: From Internet backbone to user’s computer, cell phone, PDA, etc.
Two different basic types of wireless Internet access:
1. Telephone-based (mobile phones, smartphones)
2. Computer network-based
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Telephone-based Wireless Internet Access
Competing 3G standards GSM: Used world-wide, AT&T, T-Mobile CDMA: Used primarily in U.S.
Evolution: 2G cellular networks: relatively slow, circuit-switched 2.5G cellular networks: interim networks 3G cellular networks: next generation, packet-switched 3.5G (3G+) 4G (WiMax, LTE)
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Wireless Local Area Networks (WLANs)
Wi-Fi High-speed, fixed broadband wireless LAN. Different versions for
home and business market. Limited range. WiMax
High-speed, medium range broadband wireless metropolitan area network
Bluetooth Low-speed, short range connection
Ultra-Wideband (UWB) Low power, short-range high bandwidth network
Zigbee Bonus question? Short-range, low-power wireless network technology for remotely
controlling digital devices
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Wi-Fi NetworksFigure 3.16, Page 163
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Benefits of Internet Technologies
IP multicasting: Enables efficient delivery of data to many locations on a network
Latency solutions: diffserv (differentiated quality of service)
Assigns different levels of priority to packets depending on type of data being transmitted
Guaranteed service levels and lower error rates Ability to purchase the right to move data through network at
guaranteed speed in return for higher fee
Declining costs
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Development of the Web 1989–1991: Web invented
Tim Berners-Lee at CERN HTML, HTTP, Web server, Web browser
1993: Mosaic Web browser w/ GUI Andreesen and others at NCSA Runs on Windows, Macintosh, or Unix
1994: Netscape Navigator, first commercial Web browser Andreessen, Jim Clark
1995: Microsoft Internet Explorer The Browser wars begin!
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Hypertext
Text formatted with embedded links Links connect documents to one another,
and to other objects such as sound, video, or animation files
Uses Hypertext Transfer Protocol (HTTP) and URLs to locate resources on the Web Example URL
http://megacorp.com/content/features/082602.htmlSlide 3-51
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Markup Languages
Generalized Markup Language (GML) – 1960s Standard Generalized Markup Language
(SGML) –GML variation, 1986 Hypertext Markup Language (HTML)
Fixed set of pre-defined markup “tags” used to format text Controls look and feel of Web pages
eXtensible Markup Language (XML) New markup language specification developed by W3C Designed to describe data and information Tags used are defined by user
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Web Servers and Web Clients
Web server software: Enables a computer to deliver Web pages to clients on a network that
request this service by sending an HTTP request Apache and Microsoft IIS Basic capabilities: Security services, FTP, search engine, data capture
Web server Can refer to Web server software or physical server Specialized servers: Database servers, ad servers, etc.
Web client: Any computing device attached to the Internet that is capable of
making HTTP requests and displaying HTML pages
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Web Browsers
Primary purpose to display Web pages Internet Explorer and Firefox dominate
the market Other browsers include:
Netscape Opera Safari (for Apple) Google Chrome
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The Internet and Web: Features
Internet and Web features on which the foundations of e-commerce are built include: E-mail Instant messaging Search engines Intelligent agents (bots) Online forums and chat Streaming media Cookies
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Most used application of the Internet
Uses series of protocols for transferring messages with text and attachments (images, sound, video clips, etc.,) from one Internet user to another
Instant Messaging Displays words typed on a computer almost
instantly, and recipients can then respond immediately in the same way
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Search Engines
Identify Web pages that match queries based on one or more techniques Keyword indexes, page ranking
Also serve as: Shopping tools Advertising vehicles (search engine marketing) Tool within e-commerce sites
Outside of e-mail, most commonly used Internet activity
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How Google Works
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Figure 3.22, Page 179
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Intelligent Agents (Bots)
Software programs that gather and/or filter information on a specific topic and then provide a list of results Search bot Shopping bot Web monitoring bot News bot Chatter bot
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Online Forums and Chat
Online forum: AKA message board, bulletin board, discussion board,
discussion group, board or forum Web application that enables Internet users to
communicate with each other, although not in real time Members visit online forum to check for new posts
Online chat: Similar to IM, but for multiple users Typically, users log into chat room
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Streaming Media
Enables music, video and other large files to be sent to users in chunks so that when received and played, file comes through uninterrupted
Allows users to begin playing media files before file is fully downloaded
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Cookies
Small text files deposited by Web site on user’s computer to store information about user, accessed when user next visits Web site
Can help personalize Web site experience Can pose privacy threat
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Web 2.0 Features and Services Online Social Networks
Services that support communication among networks of friends, peers
BlogsPersonal Web page of chronological entries
Really Simple Syndication (RSS) Program that allows users to have digital content
automatically sent to their computers over the Internet
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Web 2.0 Features and Services Podcasting
Audio presentation stored as an audio file and available for download from Web
Wikis Allows user to easily add and edit content on Web page
Music and video services
Online video viewing Digital video on demand
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Internet telephony (VOIP)Uses Voice Over Internet Protocol (VOIP) and
Internet’s packet-switched network to transmit voice and other forms of audio communication over the Internet
Internet television (IPTV)
Telepresence and video conferencing
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Web 2.0 Features and Services
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Web 2.0 Features and Services
Online software and Web services
Web apps, widgets and gadgets
Digital software libraries, ASPs, distributed storage
M-commerce applications
Beginning to take off
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Insight on Technology
Apps for Everything: The App EcosystemClass Discussion
What are apps and why are they so popular? Do you use any apps regularly? Which ones,
and what are their functions? What are the benefits of apps? The
weaknesses? Are there any benefits/disadvantages to the
proprietary nature of the Apple platform?
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Web features
Interactivity Flexibility Personalization Instantaneous Economical Privacy
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