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Computers © 2005 Prentice-Hall, Inc.Slide 1. Computers Chapter 3 Going Online © 2005 Prentice-Hall, Inc.Slide 2.

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Presentation on theme: "Computers © 2005 Prentice-Hall, Inc.Slide 1. Computers Chapter 3 Going Online © 2005 Prentice-Hall, Inc.Slide 2."— Presentation transcript:

1 Computers © 2005 Prentice-Hall, Inc.Slide 1

2 Computers Chapter 3 Going Online © 2005 Prentice-Hall, Inc.Slide 2

3 Computers Chapter 3 – Going Online Objectives Understand the scope of the online world, including how to go online and understanding Internet addresses Utilize Internet browsers Access various Internet applications Be aware of critical Internet issues © 2005 Prentice-Hall, Inc.Slide 3

4 Computers Going Online The Internet Internet: worldwide collection of networks ARPANET: network for scientists that evolved into the Internet Internet backbone: major communications lines of the Internet © 2005 Prentice-Hall, Inc.Slide 4

5 Computers Going Online The Internet No one group controls the Internet Three Major Organizations: The Internet Society: Open development for the benefit of the public Internet Corporation for Assigned Names and Numbers (ICANN): Assign names and addresses World Wide Web Consortium (W3C): Creates technical specifications © 2005 Prentice-Hall, Inc.Slide 5

6 Computers Going Online Connecting to the Internet Bandwidth – amount of information that can be sent over the channel 56,000 bits per second (bps) 9M (millions of bits, or megabits per second) © 2005 Prentice-Hall, Inc.Slide 6

7 Computers Going Online Connecting to the Internet Broadband – high bandwidth Narrowband – low bandwidth © 2005 Prentice-Hall, Inc.Slide 7

8 Computers Going Online Connecting to the Internet Narrowband dialup service © 2005 Prentice-Hall, Inc.Slide 8

9 Computers Going Online Connecting to the Internet Broadband cable Modem: (1 to 10 Mbps) Digital Subscriber Line (DSL): upstream: 128Kbps to 1.5 Mbps downstream: 1.5 to 9 Mbps satellite upstream: 56 Kbps to 1.5 Mbps downstream: 400 Kbps to 1.5 Mbps wireless access points wireless LAN PC card Wireless fidelity (Wi-Fi) standards (IEEE 802.11 communications standard) © 2005 Prentice-Hall, Inc.Slide 9

10 IEEE 802.11 Standards IEEE 802.11b (Wireless-B): 11 Mbps, 300’ from access point IEEE 802.11a (Wireless-A): 54 Mbps, 50’ from access point IEEE 802.11g (Wireless-G): 54 Mbps, covers longer distance

11 Computers Going Online Connecting to the Internet Internet service provider (ISP): Colleges, Schools, Corporations, Communication companies ex. SBC Information service gateway: ex. AOL, MSN, CompuServe communications software (Interface with their information system) user ID and password Direct LAN connection T-1 line (1.544 Mbps) T-3 line (44.736 Mbps) © 2005 Prentice-Hall, Inc.Slide 10

12 Computers Going Online Connecting to the Internet Transmission Control Protocol/Internet Protocol (TCP/IP) Protocol: set of rules for how computers communicate Packet: the part of a message that contains the data and the address the message is being sent to © 2005 Prentice-Hall, Inc.Slide 11

13 Computers Going Online Connecting to the Internet Point-of-presence (POP): an access point to the Internet: ISPs have many POPs for their clients (each with unique IP address) IP address Dynamic IP address © 2005 Prentice-Hall, Inc.Slide 12

14 Computers Going Online Connecting to the Internet No PC needed televisions: have built-in modems, browsers, and e-mail software, or in a Set-top Box video game consoles cellular phones Internet appliances: Internet access, e-mail, telephone, home organization applications © 2005 Prentice-Hall, Inc.Slide 13

15 Computers Going Online Retrieving and Viewing Information on the Internet Client program – Internet browser: runs on user’s computer Server program – runs on server computer © 2005 Prentice-Hall, Inc.Slide 14

16 Computers Going Online Retrieving and Viewing Information on the Internet Domain name: name or abbreviation of the name of the organization Uniform resource locator (URL): address of a web page © 2005 Prentice-Hall, Inc.Slide 15

17 Computers Going Online Retrieving and Viewing Information on the Internet URL access protocol domain name top-level domains: denote affiliation.com.edu folder filename © 2005 Prentice-Hall, Inc.Slide 16

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