chapter 2 communication, networks, and the www. what is communications? a process in which two or...
TRANSCRIPT
CHAPTER 2
CO
MM
UN
I CA
TI O
N,
NE
TW
OR
KS
, A
ND
TH
E W
WW
WHAT IS COMMUNICATIONS?
• A process in which two or more computers or devices transfer data, instructions, and information
• Sometimes called telecommunications
C H A P T E R 2 : C O M M U N I C AT I O N S , N E T W O R K S , T H E I N T E R N E T , A N D T H E W O R L D W I D E W E B 2
WHAT IS COMMUNICATIONS?
Electronic mail (e-mail)
Voice mail
Facsimile (fax)
Telecommuting
Online services
Videoconferencing
Internet
World Wide Web
C H A P T E R 2 : C O M M U N I C AT I O N S , N E T W O R K S , T H E I N T E R N E T , A N D T H E W O R L D W I D E W E B 3
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
C H A P T E R 2 : C O M M U N I C AT I O N S , N E T W O R K S , T H E I N T E R N E T , A N D T H E W O R L D W I D E W E B 4
COMMUNICATIONS NETWORKS
Communications channel
Transmissions mediaTwisted-pair cableCoaxialFiber OpticWireless
C H A P T E R 2 : C O M M U N I C AT I O N S , N E T W O R K S , T H E I N T E R N E T , A N D T H E W O R L D W I D E W E B 5
Digital vs. Analog Signals & Hardware
Dial-up ModemExternal modemInternal modem
Network Interface Cards Wired Wireless
C H A P T E R 2 : C O M M U N I C AT I O N S , N E T W O R K S , T H E I N T E R N E T , A N D T H E W O R L D W I D E W E B 6
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
C H A P T E R 2 : C O M M U N I C AT I O N S , N E T W O R K S , T H E I N T E R N E T , A N D T H E W O R L D W I D E W E B 7
COMMUNICATIONS NETWORKS
Home NetworksConnects multiple computers in your home or home office
Share Internet accessShare peripheralsCan be wired or wireless
C H A P T E R 2 : C O M M U N I C AT I O N S , N E T W O R K S , T H E I N T E R N E T , A N D T H E W O R L D W I D E W E B 8
NETWORKING THE CLASSROOM, SCHOOL, AND DISTRICT
School network server
Example classroomThree Macintosh computers
Printer
C H A P T E R 2 : C O M M U N I C AT I O N S , N E T W O R K S , T H E I N T E R N E T , A N D T H E W O R L D W I D E W E B 9
NETWORKING THE CLASSROOM, SCHOOL, AND DISTRICT
C H A P T E R 2 : C O M M U N I C AT I O N S , N E T W O R K S , T H E I N T E R N E T , A N D T H E W O R L D W I D E W E B 10
Example school network Classrooms Administration Computer lab
Example school district
Central officeVarious schools
C H A P T E R 2 : C O M M U N I C AT I O N S , N E T W O R K S , T H E I N T E R N E T , A N D T H E W O R L D W I D E W E B 11
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
C H A P T E R 2 : C O M M U N I C AT I O N S , N E T W O R K S , T H E I N T E R N E T , A N D T H E W O R L D W I D E W E B 12
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
C H A P T E R 2 : C O M M U N I C AT I O N S , N E T W O R K S , T H E I N T E R N E T , A N D T H E W O R L D W I D E W E B 13
THE BENEFITS OF COMPUTER NETWORKS IN EDUCATION
Sharing of computer hardware, software, and data resources
Unlimited educational resources
Communicate with other educators and students
C H A P T E R 2 : C O M M U N I C AT I O N S , N E T W O R K S , T H E I N T E R N E T , A N D T H E W O R L D W I D E W E B 14