kpt6044, kpt4033, networks and internet, teaching and learning with technology
TRANSCRIPT
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Teaching and Learning with Technology
Networks and the Internet
Chapter 7
Teaching and Learning with Technology
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Teaching and Learning with Technology
Networking Basics
A network • Is a collection of computers and peripherals
connected together• Networked workstations connect to a server
via hubs • Servers are more powerful computers that
provide service to users• Allows users on the network to communicate• Allows sharing of resources and data
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Teaching and Learning with Technology
Networking Basics
• Routers are used to connect multiple networks together and route data to the correct network
• Twisted pair wiring is strung to create nodes, or network outlets
• Network interface cards (NICs) are plugged into the node to connect a computer to the network
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Teaching and Learning with Technology
Networking Basics
Wireless networks • Use transmission via infrared, radio wave, or
microwave instead of cables• Save the dollars it costs to retrofit schools• May require line-of-sight transmission to work• Offer a more flexible networked instructional
environment
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Teaching and Learning with Technology
Networking Basics
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
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Teaching and Learning with Technology
Networking Basics
Network Challenges• All computers must use the same protocol or
communication method• Bandwidth must have sufficient carrying
capacity so that data will be transmitted at reasonable speeds
• Networks must provide sufficient security and privacy to protect data and users
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Teaching and Learning with Technology
Using a Network
Networked Programs -- Advantages• Programs can be installed on the server and
used by all workstations• Programs on servers are easier to install and
maintain• Require less hard drive space of individual
workstations• May be more economically purchased as site
licenses than for individual copies
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Teaching and Learning with Technology
Using a Network
Sharing Data• Every user is typically allocated some hard
drive space on the server• Server drive space lets users log into any
workstation at any location to access their data
• Data can also be placed in public areas of the server to be shared with others
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Teaching and Learning with Technology
Using a Network
Administrative Network Tools• Administrative groupware offers common
calendars, schedules, address books, and reservations lists
Academic Network Tools• Lets teachers monitor, control, and share
images on all classroom workstations
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Teaching and Learning with Technology
Using a Network
Hardware Sharing• Allows sharing of printers, scanners, or other
hardware devices among multiple workstations
• Saves on cost of multiple peripherals• Allows monitoring of and access to costly
peripherals
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Teaching and Learning with Technology
Using a Network
Communications• Email is a software program included in most
networked environments• Email allows users on a network to send and
receive electronic messages with attachments
• Offers asynchronous communication between students, teachers, and parents
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Teaching and Learning with Technology
Telecommunications
• Telecommunications refers to electronic communications between computers via phone lines
• When not directly connected to a network, telecommunications offers an alternative connection
• Modems are necessary to convert signal from digital to analog so that they can be carried on phone lines
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Teaching and Learning with Technology
Telecommunications
Modems• Vary in terms of speed of transmission
• May be internal or external relative to the computer
• Require telecommunications software to set them up and control transmission
• Networks may include multiple modems to allow connections from home computers
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Teaching and Learning with Technology
Telecommunications
Connecting to a Network• Once modems connect, you will need your
login and password to get on the network• May not be as fast as a workstation since
phone lines have small bandwidth• ISDN and DSL lines are higher bandwidth
phone lines to make access faster• Cable modems offer a faster alternative to
phone lines for high speed connections
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Teaching and Learning with Technology
The Internet
• A collection of interconnected individual networks
• Uses a common protocol, TCP/IP• Not owned or operated by any one entity but
instead is a collaborative effort to connect and communicate among networks
• Loosely regulated by the Internet Society to develop and maintain common standards and procedures
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Teaching and Learning with Technology
The Internet
Internet Service Providers (ISPs)• Provide home users temporary connections
to the Internet for a fee• The ISP’s network is connected to the
Internet and home users pay for a login to access the ISP network
• Some ISPs offer services beyond just access such as shopping, news, email, etc.
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Teaching and Learning with Technology
Internet Communications
Email• Email on the Internet works like network email
except that you can send and receive mail from beyond your own WAN
• To direct email to the right network and the right person, you use a combination of login name at network name, for example [email protected]
• Email address differ from URLs
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Teaching and Learning with Technology
Internet Communications
Conferences• Electronic bulletin boards that allow users to
read messages from others and post messages for others to read
• One-to-many communication• May be public or private• Discussions are usually threaded so a single
line of conversation can be followed through all responses
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Teaching and Learning with Technology
Internet Communications
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
• Unlike conferences that must be visited to use, listserv messages appear in subscriber’s email boxes
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Teaching and Learning with Technology
Internet Communications
Chats• Real-time conversations via the Internet
• Communication may be via typing, voice, or may include still or video images
• Chat rooms (virtual chat space) may be public or private
• Require prior appointments since chats are synchronous
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Teaching and Learning with Technology
Internet Communications
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
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Teaching and Learning with Technology
Internet Communications
Videoconferencing• Audio and video conversations via the
Internet• Uses monitor-top video cameras along with
computer speaker and microphone• Depending on bandwidth available, provides
for real-time live video interaction among users
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Teaching and Learning with Technology
Other Internet Services
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 and must be unzipped before using
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Teaching and Learning with Technology
Other Internet Services
Usenet• Newsgroups are conferences dedicated to a
particular topic of interest• Usenet is the collection of on-going
newsgroups• Newsreader programs that let you participate
in a newsgroup are built into most Internet software
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Teaching and Learning with Technology
Teaching and the Internet
• 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