tailieunhanh - Lecture Using information technology (11/e): Chapter 2 - Brian K. Williams, Stacey C. Sawyer

Chapter 2 - The internet & the world wide web: Exploring cyberspace. This chapter includes contents: connecting to the internet: narrowband, broadband, & access providers; how does the internet work? The world wide web; email & other ways of communicating over the net; the online gold mine: telephony, multimedia, webcasting, blogs, e-commerce, & social networking; the intrusive internet: snooping, spamming, spoofing, phishing, pharming, cookies, & spyware. | Chapter The Internet & the World Wide Web: Exploring Cyberspace 2 1 Chapter 2 Topics UNIT 2A: The Internet & the Web Connecting to the Internet: Narrowband, Broadband, & Access Providers How Does the Internet Work? The World Wide Web UNIT 2B: The Riches & Risks of Internet Use Email & Other Ways of Communicating over the Net The Online Gold Mine: Telephony, Multimedia, Webcasting, Blogs, E-Commerce, & Social Networking The Intrusive Internet: Snooping, Spamming, Spoofing, Phishing, Pharming, Cookies, & Spyware 2 UNIT 2A: The Internet & the Web The Internet began in 1969 as ARPANET. The Internet was text-only. In the early 1990s, multimedia became available on the Internet, and the World Wide Web (web) was born. 3 This is the first image uploaded to the web, in 1992. To connect to the Internet you need 1. An access device (computer with modem) 2. A means of connection (phone line, cable hookup, or wireless) 3. An Internet access provider Connecting to the . | Chapter The Internet & the World Wide Web: Exploring Cyberspace 2 1 Chapter 2 Topics UNIT 2A: The Internet & the Web Connecting to the Internet: Narrowband, Broadband, & Access Providers How Does the Internet Work? The World Wide Web UNIT 2B: The Riches & Risks of Internet Use Email & Other Ways of Communicating over the Net The Online Gold Mine: Telephony, Multimedia, Webcasting, Blogs, E-Commerce, & Social Networking The Intrusive Internet: Snooping, Spamming, Spoofing, Phishing, Pharming, Cookies, & Spyware 2 UNIT 2A: The Internet & the Web The Internet began in 1969 as ARPANET. The Internet was text-only. In the early 1990s, multimedia became available on the Internet, and the World Wide Web (web) was born. 3 This is the first image uploaded to the web, in 1992. To connect to the Internet you need 1. An access device (computer with modem) 2. A means of connection (phone line, cable hookup, or wireless) 3. An Internet access provider Connecting to the Internet Narrowband, Broadband, & Access Providers 5 However you connect to the Internet, the bandwidth will determine the speed of your connection. Bandwidth: Expresses how much data can be sent through a communications channel in a given amount of time. Baseband: Slow type of connection that allows only one signal to be transmitted at a time. Broadband: High-speed connections. 6 Physical connection to Internet—wired or wireless? Telephone [dial-up] modem High-speed phone line—DSL, T1/T3 Cable modem Wireless—satellite and other through-the-air links 7 Data Transmission Speeds Originally measured in bits per second (bps) 8 bits are needed to send one character, such as A or a Kbps connections send 1 thousand bits per second Mbps connections send 1 million bits per second Gbps connections send 1 billion bits per second Uploading & Downloading Upload—transmit data from local to remote computer Download—transmit data from remote to local computer 8 Narrowband (Dial-Up Modem): Low speed but

• Hệ điều hành
• Information technology
• Lecture Using information technology
• Computer technology
• Connecting to the internet
• World wide web
• Social networking