Chapter 1 Introduction.

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Presentation transcript:

Chapter 1 Introduction

Uses of Computer Networks Business Applications Home Applications Mobile Users Social Issues

Business Applications Resource sharing High reliability Reliable cost Scalability

Business Applications of Networks A network with two clients and one server.

Business Applications of Networks (2) The client-server model involves requests and replies.

Home Network Applications Access to remote information Person-to-person communication Interactive entertainment Electronic commerce

Home Network Applications (2) In peer-to-peer system there are no fixed clients and servers.

Home Network Applications (3) Some forms of e-commerce.

Combinations of wireless networks and mobile computing. Mobile Network Users Combinations of wireless networks and mobile computing.

Network Hardware Local Area Networks Metropolitan Area Networks Wide Area Networks Wireless Networks Home Networks Internetworks

Broadcast Networks Types of transmission technology Broadcast links Point-to-point links

Classification of interconnected processors by scale. Broadcast Networks (2) Classification of interconnected processors by scale.

Local Area Networks Two broadcast networks (a) Bus (b) Ring

Metropolitan Area Networks A metropolitan area network based on cable TV.

Relation between hosts on LANs and the subnet. Wide Area Networks Relation between hosts on LANs and the subnet.

A stream of packets from sender to receiver. Wide Area Networks (2) A stream of packets from sender to receiver.

Wireless Networks Categories of wireless networks: System interconnection Wireless LANs Wireless WANs

Wireless Networks (2) (a) Bluetooth configuration (b) Wireless LAN

Wireless Networks (3) (a) Individual mobile computers (b) A flying LAN

Home Network Categories Computers (desktop PC, PDA, shared peripherals Entertainment (TV, DVD, VCR, camera, stereo, MP3) Telecomm (telephone, cell phone, intercom, fax) Appliances (microwave, fridge, clock, furnace, airco) Telemetry (utility meter, burglar alarm, babycam).

Network Software Protocol Hierarchies Design Issues for the Layers Connection-Oriented and Connectionless Services Service Primitives The Relationship of Services to Protocols

Network Software Protocol Hierarchies Layers, protocols, and interfaces.

Protocol Hierarchies (3) Example information flow supporting virtual communication in layer 5.

Design Issues for the Layers Addressing Direction of data flow –smplex ,half duplex,full duplex Error Control Flow Control Multiplexing, Demultplexing Routing

Connection-Oriented and Connectionless Services Six different types of service.

Service Primitives Five service primitives for implementing a simple connection-oriented service.

Service Primitives (2) Packets sent in a simple client-server interaction on a connection-oriented network.

Services to Protocols Relationship The relationship between a service and a protocol.