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Teaching and Learning with Technology Allyn and Bacon 2005 Teaching and Learning with Technology title style Allyn and Bacon 2002 Teaching and Learning with Technology style Allyn and Bacon 2005 Teaching and Learning with Technology Networks and the Internet Chapter 7 ching and Learning with Technol

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Page 1: Teaching and Learning with Technology ck to edit Master title style  Allyn and Bacon 2002 Teaching and Learning with Technology k to edit Master title

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Teaching and Learning with Technology

Networks and

the Internet

Chapter 7

Teaching and Learning with Technology

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Network• Collection of

computers and peripherals connected together

• Networked workstations connected to a server via hubs

Networking Basics

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A network • Has a server that is a more powerful

computers configured to “serve” the workstations attached to it

• Allows users on the network to communicate

• Allows sharing of resources and data

Networking Basics

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• Every workstation is connected to its server

• In a wired network, workstations are connected through a hub via cables.

• In a wireless network, workstations are connected via infrared, microwave, or radio transmission

Networking Basics

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Wired School Networks• Typically, networks in schools use a

cable similar to telephone wire.• The wire is usually run through the

ceiling • A single wire for each workstation is

then dropped down inside the walls.

Networking Basics

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Wireless School Networks • Transmit via infrared, radio wave, or

microwave • Saves cost on retrofitting schools• May require line-of-sight transmission• Offer flexible networked instructional

environment

Networking Basics

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Types of Networks include:• Local Area Networks (LANs)

• Serve a local area such as a single school

• Wide Area Networks (WANs)• Serve a wider area such as a school

district• WANs typically include multiple LANs

Networking Basics

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Networking Basics

Network Challenges• The protocol must be

the same across networks

• Bandwidth must have sufficient carrying capacity

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Networking Basics

Network Challenges• Networks must provide sufficient

security and privacy

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Network Advantages• Programs installed on the server can be

used by all workstations• Programs on servers are easier to install

and maintain• Require less hard drive space on

individual workstations• May be more economically purchased with

site licenses

Networking Basics

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Data Sharing• Users typically allocated hard drive

space on the server• Server drive space lets users log into

any workstation at any location and still have access to their files

• Data can be placed in public areas of the server

Networking Basics

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Administrative Network Tools

• Administrative groupware offers common administrative programs

Academic Network Tools• Lets teachers monitor, control, and

share images on all workstations

Networking Basics

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Hardware Sharing• Allows sharing of printers, scanners,

etc. among multiple workstations• Saves on cost of multiple peripherals• Allows monitoring of and access to

costly peripherals

Networking Basics

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Communications• Email, a software program, included in

most networked environments

Networking Basics

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Communications• Allows users on a network to send

and receive electronic messages

• Email offers asynchronous communication between students, teachers, and parents

Networking Basics

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Telecommunications • Electronic communications between

computers via phone lines

Telecommunications

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Telecommunications

• Offers an alternative to a direct network connection

• Modems needed to convert signals from digital to analog

• Modems must be located on both the sending and receiving computer

Telecommunications

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Modems• Vary in terms of speed of transmission• May be internal or external relative to

the computer• Require telecommunications software • Networks may include multiple

modems to allows connections from home computers

Telecommunications

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Connecting to a Network• Once modems connect, a login and

password are needed • Modems may not be as fast as a workstation

since phone lines have small bandwidth– ISDN and DSL lines are higher bandwidth and

makes access faster– Cable modems also offer a faster alternative

to phone lines

Telecommunications

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• A collection of interconnected individual networks

• Uses a common protocol, TCP/IP

• Not owned or operated by any one entity

• Regulated by the Internet Society

The Internet

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Internet Service Providers (ISPs)• Provide home users temporary

connections to the Internet• The ISP’s network is connected to the

Internet • Home users pay for a login to access the

ISP network• Some ISPs offer services beyond just

access such as shopping, news, email, etc

The Internet

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Email• Email on the Internet works like network

email • You can send and receive mail from

beyond your own WAN• Email addresses differ from URLs• Use a combination of login name at

network name, for example [email protected]

Internet Communications

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Conferences• Electronic bulletin boards or forums allow

users to read messages from others • Can post messages for others to read• One-to-many communication• May be public or private• Discussions are usually threaded - A single

line of conversation can be followed through all responses

Internet Communications

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Mailing Lists (Listservs)• Electronic automated mailing lists that

delivers messages to all subscribers• May have a moderator to manage and

approve mail messages before sending to all subscribers

• Conferences must be visited to use them while listserv messages appear in the subscriber’s email box

Internet Communications

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Chats• Real-time conversations via the Internet• Communication may be via typing or voice• May include still or video images• Chat rooms (virtual chat space) may be

public or private • Require prior appointments since chats are

synchronous

Internet Communications

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Telephony• Voice conversations via the Internet• Uses computer speaker and microphone as

a telephone handset• Telephony software dials and sets up

communication among users• Local calls to ISPs may enable long distance

connections

Internet Communications

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Videoconferencing• Audio and video conversations via the

Internet• Uses monitor-top video cameras along with

computer speaker and microphone• Provides for real-time live video interaction

among users• Classrooms around the world can be

connected via compressed video.

Internet Communications

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File Transfer Protocol (FTP)• Software that allows users to upload (send

files to the Internet) and download (receive files from the Internet)

• FTP Sites are virtual libraries of downloadable files

• Files are usually compressed (zipped) for faster transmission

• Compressed files must be unzipped before using

Other Internet Services

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Usenet• Newsgroups are conferences dedicated

to particular topics

• Usenet is the collection of on-going newsgroups

• Newsreader programs are built into most Internet software

Other Internet Services

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• The world knowledge base is now available in any classroom that can connect to the Internet

• The Internet makes global communication for learning possible

• Students and teachers can participate in virtual learning communities across nations

Teaching and the Internet