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Teaching and Learning with Technology Allyn and Bacon 2005Teaching and Learning with Technology
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Allyn and Bacon 2002Teaching and Learning with Technology
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Allyn and Bacon 2005Teaching and Learning with Technology
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