chapter 2 communication, networks, and the www. what is communications? a process in which two or...

CHAPTER 2

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WHAT IS COMMUNICATIONS?

• A process in which two or more computers or devices transfer data, instructions, and information

• Sometimes called telecommunications

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WHAT IS COMMUNICATIONS?

Electronic mail (e-mail)

Voice mail

Facsimile (fax)

Telecommuting

Online services

Videoconferencing

Internet

World Wide Web

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COMMUNICATIONS NETWORKS

Basic communications systemTwo computers, one to send and one to receive data

Communications devices that send and receive data

A communications channel over which data is sent

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COMMUNICATIONS NETWORKS

Communications channel

Transmissions mediaTwisted-pair cableCoaxialFiber OpticWireless

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Digital vs. Analog Signals & Hardware

Dial-up ModemExternal modemInternal modem

Network Interface Cards Wired Wireless

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COMMUNICATIONS NETWORKS

COMMUNICATIONS NETWORKS

Local Area Networks (LAN)Covers limited geographical areaServer manages resources

Wide Area Networks (WAN)Covers large geographical areaCan consist of several LANs

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COMMUNICATIONS NETWORKS

Home NetworksConnects multiple computers in your home or home office

Share Internet accessShare peripheralsCan be wired or wireless

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NETWORKING THE CLASSROOM, SCHOOL, AND DISTRICT

School network server

Example classroomThree Macintosh computers

Printer

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NETWORKING THE CLASSROOM, SCHOOL, AND DISTRICT

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Example school network Classrooms Administration Computer lab

Example school district

Central officeVarious schools

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NETWORKING THE CLASSROOM, SCHOOL, AND DISTRICT

NETWORKING THE CLASSROOM, SCHOOL, AND DISTRICT

Wireless schools and classrooms

Keep in touch with family and friends from anywhere Smart phones Handheld or netbook

computers Notebook computers

Wireless technology brings the computer lab to students

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NETWORKING THE CLASSROOM, SCHOOL, AND DISTRICT

High-Speed or Broadband AccessGovernment works to provide high speed Internet access to classrooms

Broadband technology transmits signals at much faster speeds

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THE BENEFITS OF COMPUTER NETWORKS IN EDUCATION

Sharing of computer hardware, software, and data resources

Unlimited educational resources

Communicate with other educators and students

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