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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

Computers

© 2005 Prentice-Hall, Inc.

Slide 1

computers2

Computers

Chapter 6

Networks and Networking

© 2005 Prentice-Hall, Inc.

Slide 2

computers chapter 6 networks and networking

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

computers networks and networking

ComputersNetworks and Networking

Our Wired World

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

© 2005 Prentice-Hall, Inc.

Slide 4

computers networks and networking5

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

computers networks and networking6

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

computers networks and networking7

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

computers networks and networking8

ComputersNetworks and Networking

Data Communications Hardware

Data communications or telecommunications – distribution of data

© 2005 Prentice-Hall, Inc.

Slide 8

computers networks and networking9

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

computers networks and networking10

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

computers networks and networking11

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

computers networks and networking12

ComputersNetworks and Networking

Data Communications Hardware

Modem

Internal

External

Voice/data/fax modem

© 2005 Prentice-Hall, Inc.

Slide 12

computers networks and networking13

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

computers networks and networking14

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

computers networks and networking15

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

computers networks and networking16

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

computers networks and networking17

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

computers networks and networking18

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

computers networks and networking19

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

computers networks and networking20

ComputersNetworks and Networking

Data Communications Hardware

Telephony – integration of telephones and computers

© 2005 Prentice-Hall, Inc.

Slide 20

computers networks and networking21

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

computers networks and networking22

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

computers networks and networking23

ComputersNetworks and Networking

The Data Communications Channel

Transmission media

Measured in bits per second (bps)

© 2005 Prentice-Hall, Inc.

Slide 23

computers networks and networking24

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

computers networks and networking25

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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