COMPUTERS IN THE CLASSROOM
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COMPUTERS IN THE CLASSROOM CT 243 Emery Roth [email protected] http://uhaweb.hartford.edu/eroth/ CHAPTER 2 Communications, Networks, the Internet, and the World Wide Web http://www.scsite.com/tdc2/ Q&A What are the two main categories of software…

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COMPUTERS IN THE CLASSROOM

CT 243

Emery Roth

[email protected]

http://uhaweb.hartford.edu/eroth/


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CHAPTER 2Communications, Networks, the Internet, and the World Wide Web




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What are the two main categories of software…

and how are they different? (1.13-1.14)


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What are the “National Educational Technology Standards for Teachers” (NETS-T), and where do they come from? (1.19-1.20)


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What is a “motherboard,” for Teachers” (NETS-T), and where do they come from?

and

what are its two main components? (1.08)


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What are 5 components of a computer? for Teachers” (NETS-T), and where do they come from?

…and give examples of each. (1.07-1.10)


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What is, “the Internet,” for Teachers” (NETS-T), and where do they come from?

and

what are several ways it is useful for teachers? (1.17-1.18)


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http://www.scsite.com/tdc2/ for Teachers” (NETS-T), and where do they come from?

Click on “Chapter 1”

From the menu on the left, select “Integration Corner,” then “chapter 1”

Scroll to any level of personal interest & explore one resource


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PROCESSING YOUR CLASSMATE SKETCHES for Teachers” (NETS-T), and where do they come from?

  • Gather by teams to regroup

  • Read at least 3 sketches.

  • Select group recorder (WP).

  • Process:

    • I really liked…

    • I learned to…

    • How do I…?

    • Publish???


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To publish or not to publish… for Teachers” (NETS-T), and where do they come from?


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Drawing Tablet for Teachers” (NETS-T), and where do they come from?

  • pressure-sensitive

  • designed to work with software applications that simulate real artists’ media


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spreadsheet for Teachers” (NETS-T), and where do they come from?


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ASSIGNMENT for Teachers” (NETS-T), and where do they come from?

posted on blackboard & web site

Web site:

http://uhaweb.hartford.edu/eroth/


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CHAPTER 2 for Teachers” (NETS-T), and where do they come from? Communications, Networks, the Internet, and the World Wide Web


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Objectives for Teachers” (NETS-T), and where do they come from?

  • Define communications

  • Identify the basic components of a communications system

  • Describe how and why network computers are used in schools and school districts

  • Explain how the Internet works

  • Describe the World Wide Web portion of the Internet

  • Specify how Web documents are linked to one another

  • Explain the use of Web browser software

  • Explain how to use a Web search tool to find information

  • Identify several types of multimedia products available on the Web

  • Explain how Internet services such as e-mail, newsgroups, chat rooms, and instant messaging work

  • Describe how to connect to the Internet and the WWW


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Communications Networks for Teachers” (NETS-T), and where do they come from?

  • Communications - refers to the transmission of data and information between two or more computers using a communications channel such as standard telephone lines

  • Communications network - is a collection of computers and other equipment organized to share data, information, hardware, and software

  • Communications software - programs that manage the transmissions of data between computers

  • Communications channel - is the path the data follows as the data is transmitted from the sending equipment to the receiving equipment in a communications system.


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Communications Networks Continued for Teachers” (NETS-T), and where do they come from?

  • Transmission media - is the physical materials or other means used to establish a communications channel

    • Twisted-pair cable - consists of pairs of plastic-coated copper wire twisted together

    • Other examples (coaxial cable, fiber-optic cable, microwave transmission, communications satellites, and wireless transmissions


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Communications Networks Continued for Teachers” (NETS-T), and where do they come from?

  • Digital signals - are individual electric pulses that a computer uses to represent data

  • Analog signals - continuous electrical wave used for telephone transmission and other devices

  • Modem - converts analog signals into digital signals

  • Network interface card (NIC) - connects computers directly to a school or business network without using a modem


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Types of Networks for Teachers” (NETS-T), and where do they come from?

  • Local area networks (LAN) - is a communications network that covers a limited geographical area such as a school, an office, a building, or a group of buildings

  • Wireless LAN (WLAN) - uses no wires, instead it uses wireless media, such as radio waves.

  • Wide area networks - covers a large geographical region and used regular telephone cables, digital lines, microwaves, wireless systems, satellites, or othercombinations of communications channels.

  • Home networks - if you have multiple computers in your home or home office you can create your own network


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History of the Internet for Teachers” (NETS-T), and where do they come from?

  • ARPANET - Advanced Research Projects Agency Network

    • allow scientists to share information

    • parts could function even if some of it went down

    • Established 1969 and by 1984 it had 1,000 hosts

  • In 1986 NSFnet joined together with ARPANET to serve as the backbone of the Internet

  • In 1995 NSF turned over responsibilities to major corporations

  • Internet2 - extremely high speed network that will develop and test advanced Internet technologies for research, teaching, and learning.


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How the Internet works for Teachers” (NETS-T), and where do they come from?

  • Step 1. Data is divided into small pieces, called packets.

  • Step 2. Packets travel over the Internet via routers.

  • Step 3. At the destination, the packets are reassembled into the original message.

    • Packet switching

  • TCP/IP - transmission control protocol/Internet protocol - protocol used to define packet switching


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ISP vs. OSP vs. WSP for Teachers” (NETS-T), and where do they come from?

  • Internet service provider (ISP) - allows you to connect to the internet for a fee. (ex. Netzero, ATT)

  • Online service provider (OSP) - allows you to connect to the internet and also provides other personalized options for a higher fee than an ISP

  • Wireless service provider (WSP) - allows users to connect to the internet without any wires. (ex. Palm)


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Ways to Connect to the Internet for Teachers” (NETS-T), and where do they come from?

  • Dial-up access - you use your computer and a modem to dial in to the internet. (56k)

  • Cable modem - you use your existing tv cable and a cable modem (20-50 x faster)

  • Digital subscriber line - you use digital phone lines and dsl card. (25-150 x faster)


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Internet Backbone for Teachers” (NETS-T), and where do they come from?

  • Step 1: Request a web page from your home computer

  • Step 2: Modem converts digital to analog

  • Step 3: Data travels through telephone lines to local ISP

  • Step 4: Data may travel through 1 or more routers

  • Step 5: Regional ISP uses lines, leased from a telephone company, to send data to a national ISP

  • Step 6: A national ISP routes data across the country to another national ISP

  • Step 7: Data moves from a national ISP to a local ISP to a server that contains the requested site

  • Step 8: The server requests the data and sends it back through the internet.


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Internet Addresses for Teachers” (NETS-T), and where do they come from?

  • The Internet uses addresses the same way the post office does. Each computer has a specific numeric address.

    I.e. 137.49.1.150

  • Domain name - the text version of a computer address

  • Domain abbreviations - .com, .edu, .gov, .mil, .net, .org, .k12

  • Country abbreviations

    • Au - Australia; CA - Canada; UK - United Kingdom


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World Wide Web for Teachers” (NETS-T), and where do they come from?

  • The Web - consists of electronic documents that have built in hyperlinks to other related documents

  • Hyperlinks - allow users to navigate quickly from one page to another

  • Web page - electronic document viewed on the Web that can contain audio, video, text, etc.

  • Web site - a collection of related web pages

  • Home page - starting point of a web site

  • URL - uniform resource locator

  • HTTP - hypertext transfer protocol


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How a Web Page Works for Teachers” (NETS-T), and where do they come from?

  • Three types of hyperlinks exist

    • Target hyperlinks - links within the same page

    • Relative hyperlinks - link to another document on the same Internet computer (server)

    • Absolute hyperlinks - link to another document that could be located on a computer across the country

  • HTML - hypertext mark-up language - the code that defines what a website will look like


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Web Browser Software for Teachers” (NETS-T), and where do they come from?

  • A web browser is a program that interprets HTML and displays Web pages and allows links to other pages

  • Mosaic - developed in 1993 by Marc Andreesen, a student at the University of Illinois

  • Netscape, Internet Explorer, AOL, Safari


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Searching for Info. on the Web for Teachers” (NETS-T), and where do they come from?

  • Search tools - enable users to locate information found at Web sites all over the world

  • Search engine - a type of search tool that uses keywords

  • Subject directory - a type of tool that allows the user to navigate the directories and subdirectories


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Multimedia on the Web for Teachers” (NETS-T), and where do they come from?

  • Multimedia is the combination of graphics, animation, audio, video, and virtual reality

  • Graphics - were the first media used to enhance text only sites

  • Animation - is the appearance of motions created by displaying a series of still images in rapid sequence

  • Audio - you can listen to prerecorded audio clips and live audio

  • Video - consists of full motion images that are played back at various speeds

  • Virtual reality - is the simulation of a real or imagined environment


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E-mail for Teachers” (NETS-T), and where do they come from?

  • E-mail (electronic mail) - is the transmission of messages and files via a computer network

  • E-mail program - allows you to compose, view, send, and receive email

  • E-mail address - is a combination of a user name and a domain name


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File Transfer Protocol for Teachers” (NETS-T), and where do they come from?

  • FTP - is an Internet standard that allows you to exchange files with other computers on the Internet.

  • Anonymous FTP - anyone can transfer files on this type of site.


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Information Sharing via the Web for Teachers” (NETS-T), and where do they come from?

  • Newsgroup - is an online area in which users conduct written discussions about a particular subject

  • Mailing list - is a group of email addresses given a single name

  • Chat rooms - is a real-time typed conversation

  • Instant messaging - is real-time Internet communications service that notifies you when one or more people are online.

  • Netiquette - is the code of acceptable behavior while on the Internet


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Interesting Sites for Teachers” (NETS-T), and where do they come from?

  • http://www.epals.com


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