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Computers © 2005 Prentice-Hall, Inc. Slide 1 Computers Chapter 6 Networks and Networking © 2005 Prentice-Hall, Inc. Slide 2 Computers Chapter 6 – Networks and Networking Objectives Apply the concept of connectivity to your life Understand data communications hardware

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Computers l.jpg

Computers

© 2005 Prentice-Hall, Inc.

Slide 1


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Computers

Chapter 6

Networks and Networking

© 2005 Prentice-Hall, Inc.

Slide 2


Computers chapter 6 networks and networking l.jpg

ComputersChapter 6 – Networks and Networking

Objectives

Apply the concept of connectivity to your life

Understand data communications hardware

Identify data transmissions services

Understand the various network topologies

Recognize the potential of home networking

© 2005 Prentice-Hall, Inc.

Slide 3


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ComputersNetworks and Networking

Our Wired World

Connectivity – the degree to which software, hardware, and databases are functionally linked

© 2005 Prentice-Hall, Inc.

Slide 4


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ComputersNetworks and Networking

Our Wired World

Cooperative processing

Intracompany networking – cooperation within the company

Intercompany networking – cooperation with other companies and customers

© 2005 Prentice-Hall, Inc.

Slide 5


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ComputersNetworks and Networking

Our Wired World

Intranet –internal network based on Internet technology

Extranet – an extension of an intranet, partially available to authorized customers and suppliers

© 2005 Prentice-Hall, Inc.

Slide 6


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ComputersNetworks and Networking

Our Wired World

Virtual Private Network (VPN) – network transmissions are tunneled through the Internet

Tunneling – one network uses another to send data

© 2005 Prentice-Hall, Inc.

Slide 7


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ComputersNetworks and Networking

Data Communications Hardware

Data communications or telecommunications – distribution of data

© 2005 Prentice-Hall, Inc.

Slide 8


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ComputersNetworks and Networking

Data Communications Hardware

Server computers – central computers that control the network

Client computers – computers, linked to a server, that create the network

© 2005 Prentice-Hall, Inc.

Slide 9


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ComputersNetworks and Networking

Data Communications Hardware

Proxy server computers – handle some requests, hand others to the actual server computers

© 2005 Prentice-Hall, Inc.

Slide 10


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ComputersNetworks and Networking

Data Communications Hardware

Telephone-link modem – converts analog signals to digital and digital signals to analog

Analog – voice communication, such as over a telephone line

Digital – 1’s and 0’s used to represent data in a computer

© 2005 Prentice-Hall, Inc.

Slide 11


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ComputersNetworks and Networking

Data Communications Hardware

Modem

Internal

External

Voice/data/fax modem

© 2005 Prentice-Hall, Inc.

Slide 12


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ComputersNetworks and Networking

Data Communications Hardware

Cable modem – provides Internet access via cable television lines

DSL (Digital Subscriber Line) – Internet access via special line provided by a telephone company

Satellite modem – Internet access via communications satellite

© 2005 Prentice-Hall, Inc.

Slide 13


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ComputersNetworks and Networking

Data Communications Hardware

Network interface card (NIC) – also called network card and network adapter

Needed to connect a personal computer to a network

Ethernet – de facto standard

© 2005 Prentice-Hall, Inc.

Slide 14


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ComputersNetworks and Networking

Data Communications Hardware

Gateway – allows for communication between networks using different protocols

Router – routes messages to the appropriate destination

Gateway router – both functions in one device

© 2005 Prentice-Hall, Inc.

Slide 15


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ComputersNetworks and Networking

Data Communications Hardware

Message

Source – device that sends the message

Destination – device that receives the message

Handshaking – router establishes the connection between the source and the destination

© 2005 Prentice-Hall, Inc.

Slide 16


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ComputersNetworks and Networking

Data Communications Hardware

Network address – assigned to each computer on a network; used to send messages to the appropriate destination

Backbone – the routers, gateways, and other equipment that link the computers of the network

© 2005 Prentice-Hall, Inc.

Slide 17


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ComputersNetworks and Networking

Data Communications Hardware

Hub – expands the number of nodes on a network

Half-duplex – data can only be sent in one direction at a time

Switch – acts like a hub for a local area network (LAN)

Full-duplex – data can be sent in both directions at once

© 2005 Prentice-Hall, Inc.

Slide 18


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ComputersNetworks and Networking

Data Communications Hardware

Terminals

Video Display Terminal (VDT) – input/output device

Thin client – smart terminal, capable of some processing

© 2005 Prentice-Hall, Inc.

Slide 19


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ComputersNetworks and Networking

Data Communications Hardware

Telephony – integration of telephones and computers

© 2005 Prentice-Hall, Inc.

Slide 20


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ComputersNetworks and Networking

Data Communications Hardware

Automatic Teller Machine (ATM) – used in banking

Point-of-Sale (POS) terminals – used in retail

© 2005 Prentice-Hall, Inc.

Slide 21


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ComputersNetworks and Networking

The Data Communications Channel

Communications channel – media a message must pass through on a network

Line

Link

Pipe

© 2005 Prentice-Hall, Inc.

Slide 22


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ComputersNetworks and Networking

The Data Communications Channel

Transmission media

Measured in bits per second (bps)

© 2005 Prentice-Hall, Inc.

Slide 23


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ComputersNetworks and Networking

The Data Communications Channel

Twisted-pair wire

POTS (plain old telephone services)

Digital Subscriber Line (DSL)

Cat5 cabling – uses four twisted pairs of wire; speeds of up to 100 Mbps

Cat5e cabling – speeds of up to 1 Gbps

© 2005 Prentice-Hall, Inc.

Slide 24


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ComputersNetworks and Networking

The Data Communications Channel

Coaxial cable – high capacity channel, capable of speeds up to 10 M bps

Fiber optic cable – carries data as laser generated pulses of light

© 2005 Prentice-Hall, Inc.

Slide 25


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