unit-1 types of internet connection

7/27/2019 UNIT-1 Types of Internet Connection

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Discuss connectivity, thewireless revolution, andcommunication systems

Describe physical and wirelesscommunications channels

Discuss connection devices,including modems, T1, DSL,cable modem, and satelliteconnections

Describe data transmissionfactors, including bandwidthsand protocols

Discuss network and keynetwork terminology

R.C.Poonia


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Jaipur National University - Jaipur

Describe different types of

networks, including local area,

metropolitan area, and wide

area networks

Describe network

architectures, including

configurations and strategies

Describe organizational uses of

Internet technologies,

including intranets, extranets,

and firewalls

R.C. Poonia


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Communications

The process of sharing data, programs, and

information between two or more computers


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Communications Today

Numerous applications depend on communicationsystemsE-mail, I nstant messaging(IM), Internettelephone, and Electronic commerce

Connectivityuses computer networks to link people

and resourcesGoing wirelesshas been the most dramatic change


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Communication Systems

Four basic elementsSending and receiving devices

Communication channel

Connection devices

Data transmission specifications


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Communication Channels

Channels carry data from one computer to

another

Two categories ofcommunication channels

Physical connection

Wireless connection


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Connection Device Signals

Types of signals

Analog

Digital


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Connection Device Types

Types of modems

External

Internal

PC Card

Wireless


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Connection Services

Dial-Up services

Leased linesT1, T2, T3 and T4

Digital subscr iber l ine (DSL)

Uses existing phone lines

One type widely used is ADSL

Cable modems

Uses existing TV cable

Provides speeds as fast as DSL at a lower cost

Satel l i te/air connection services

Seven times faster than dial-up

Slower than DSL & cable modem


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Typical User Connection Costs & Speeds

Type Fee Speed Seconds to Get

Images

Dial-up 56 kbps 45.0

DSL 1.5 mbps 1.7

Cable Modem 1.5 mbps 1.7

Satellite 900 kbps 2.8


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Bandwidth

Measurement of the capacity of the channel

Categories

Lowbandwidthsor Voiceband

Medium band

Broadband

Used for high capacity transmission

Used by DSL, cable, and satellite


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Protocols

Set of communication rules

Standard for Internet: TCP/IP (Transmission

control protocol/I nternet protocol)

Identifies devices

Reformats information


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Networks

A computer network is a communication

system

Connects two or more computers

Allows information exchange


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Network Terms

Node

Client

Server

Hub

Network inter face cards (NIC)

Network operating system

(NOS)

Distr ibuted processing

Host computer

Network manager

Computer Networks Connect Computers


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Network Types

Local area networks

Home networks

WLAN

Metropoli tan

area networks

Wide area networks


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Network Architecture

Architecturedescribes how a network is

arranged

Arrangement is called topology

Types of network topology

Star

Bus

Ring

Hierarchical


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Strategies

Strategyis a way ofcoordinating the

sharing of information

and resources

Common networkstrategies

Terminal

Client/server

Peer-to-peer


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Internets and ExtranetsIntranets

Private network within anorganization

Provides information to employees

Extranets

Private network that connects

organizations

Used to allow suppliers and others

access

Firewalls

Security system

Protects against external threats


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A Look to the FutureWireless Robotic Car

Pod car (Personalization on Demand)

Predicts and responds

Designed to learn and adapt to an individual'sdriving needs and habits


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Discussion Questions

Define and discuss connectivity, the wirelessrevolution, and communications.

Identify and describe the various physical andwireless communication channels.

Identify the standard Internet protocol anddiscuss its essential features.

Define and discuss the four principal network

topologies.

Define and discuss the three most commonnetwork strategies.

unit-1 types of internet connection

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