Transcript spot 3f05 - Computer Science Home

Computers Are
Your Future
© 2006 Prentice-Hall, Inc.
Computers Are Your Future Spotlight 3
Computers Are Your Future
Spotlight 3
Home Networks
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
Home Networks
 2/3 of all households own a computer
 20 Million have more than one computer
 Multi-computer households:
 Can share data
 Can share scanners and printers
 Can share a single Internet connection
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
Home Networks
 A home network enables users to quickly and
conveniently share files and resources using network
connections between computers and peripheral
devices
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
Home Ethernet Networks
 Ethernet is a communications standard that specifies
how physically connected computers in a network
send data
 Send data in packets, over wires
 Most popular wiring is twisted pair
 CAT-3
 CAT-5
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
Home Ethernet Networks
 A hub is an external
communications device with
multiple connectors (ports)
 Ethernet network adaptor or
home interface card (NIC) is
an internal communications
device that uses electrical
signals to communicate
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
Home Ethernet Networks
 A switch is like a hub, but more efficient
 A switch knows about all computers connected to it
and transmits data only to the computer to which the
data is addressed
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
Home Phone-line Networks
 Use a home’s existing telephone
wiring
 Simple installation
 Reliability
 Compatible with other home
networking technologies
 Works with all computer makes
and models
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
Home Phone-line Networks
 Disadvantages
 Special hardware/software may be needed
 May need to install home phone-line NIC
 May need to run new phone wiring
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
Home Power-line Networks
 Uses existing electrical wiring
 Inexpensive and easy to install
 Peripheral can be located anywhere
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
Home Power-line Networks
 Disadvantages
 Need 110-volt electrical wiring
 Takes up a lot of space
 Connection speeds are slow
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
Wireless Home Networks
 HomeRF
 Wi-Fi
 Three factors to determine which type
 Cost of hardware/software
 Speed of data
 Range within which you can transmit between
devices
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
Home Radio-frequency Networks
 Wireless networks in which each computer on the
network broadcasts its information to another using
radio signals
 Network access points send and receive data
between computers
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
Home Radio-frequency Networks
 Peer-to-peer relationship exists among all
computers in the network.
 Three standards:
 802.11b
 802.11a
 802.11g
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
Home WiFi Networks
 Ad hoc
 No access point or server
 Wireless data exchange cards
 Client/server
 2.4 GHz
 Recommended for Macs
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
Planning
 What are you trying to accomplish with your
network?
 Small business or personal use?
 One computer or many?
 Hardware in one room or many?
 What wiring technology will I use?
 What hardware/software do I need to buy?
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
Configuration
 Designate PC’s that will be part of the network
 Installing hardware and software
 Designate how files, folders, peripherals, and
Internet connection will be shared
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Computers Are Your Future Spotlight 3
Maintenance and Support
 Set up a regular maintenance schedule
 Clean dust and lint from around router
 Clean contacts on network cards
 Refresh network settings
© 2006 Prentice-Hall, Inc
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Computers Are Your Future Spotlight 3
The Future of Home Networking
 Convergence
 Using home networks to control appliances
 Home security
 Central control unit
 Wireless
© 2006 Prentice-Hall, Inc
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