By. Shafiq Ahmed Chachar

Internet Applications

E-mail

InternetRelayChat

Telnet

Search Engines

E-CommerceFile

TransferProtocol (FTP)

Popular Uses of the

Internet

Popular Uses of the

Internet

By. Shafiq Ahmed Chachar

Basic Components in a Telecommunications Network

TelecommunicationsSoftware

TelecommunicationsSoftware

1

2 3

4

52

PCs, NCs, and Other Terminals

ComputersTelecommunicationsChannels and Media

TelecommunicationsProcessors

By. Shafiq Ahmed Chachar

Wide Area Networks

By. Shafiq Ahmed Chachar

Local Area Networks

NetworkServer

NetworkServer

Shared Database and

Software Packages

SharedPrinter

PCPC

PC PC PC

Internetwork Processor to Other Networks

By. Shafiq Ahmed Chachar

Other E-Business Networks

Router

IntranetServer

Host System

IntranetServer

TheInternet

Fire wall

Fire wall

RouterExtranet

By. Shafiq Ahmed Chachar

Client/Server Networks and Network Computing

NetworkServer

NetworkServer

Host SystemSuperserverHost SystemSuperserver

Client

User InterfaceApplication Processing

Application ControlDistributed Database

Central database controlHeavy duty processing

ServerServer ServerServer

NetPC

Browser-basedUser Interface

Web OSApplication Software

Application

DBMS

DB

By. Shafiq Ahmed Chachar

Telecommunications Communication Media

• Twisted Pair

• Coaxial Cable

• Fiber Optics

• Terrestrial Microwave

• Communication Satellites

• Cellular Technologies

• Wireless LAN

By. Shafiq Ahmed Chachar

Telecommunications Processors and Software

• Modems• Multiplexers• Internetwork

Processors– Switches– Routers– Hubs– Gateways

• Fire walls

• Network Operating System

• Telecommunications Monitor

• Middleware• Network Management

Software

By. Shafiq Ahmed Chachar

Network Topologies

By. Shafiq Ahmed Chachar

Network Protocols: The OSI Architecture

Application LayerApplication Layer

Presentation LayerPresentation Layer

Session LayerSession Layer

Transport LayerTransport Layer

Network LayerNetwork Layer

Data Link LayerData Link Layer

Physical LayerPhysical Layer

SevenLayers ofthe OSICommunicationsArchitecture

By. Shafiq Ahmed Chachar

The Internet’s TCP/IP

Application orProcess Layer

Internet Protocol (IP)

Host-to-Host Transport Layer

Network Interface

Physical Layer

ApplicationLayer

PresentationLayer

SessionLayer

TransportLayer

NetworkLayer

Data LinkLayer

PhysicalLayer

OS

I M

od

el

By. Shafiq Ahmed Chachar

Chapter Summary (cont)

• The major components of any telecommunications network are: – Terminals,– Telecommunications processors, – Communication channels, – Computers, and – Telecommunications software.

• There are several basic types of telecomm networks, including wide area networks (WANs) and local area networks (LANs).

By. Shafiq Ahmed Chachar

Chapter Summary (cont)

• Key telecommunications network alternatives include telecommunications media, processors, software, channels, and architectures.