EE450-U0-Introduction_Lecture-Nazarian-Summer10

EE450-U0-Introduction_Lecture-Nazarian-Summer10 - EE450...

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EE450 Computer Networks Introduction Shahin Nazarian Summer 2010
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Shahin Nazarian/EE450/Summer 2010 Network 2
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Shahin Nazarian/EE450/Summer 2010 Computer Network What is a computer network? What is Internet? A computer network is a collection of computers and devices connected to each other Internet is the network of network; a computer network that interconnects hundreds of millions of computing devices throughout the world Increasingly, nontraditional Internet end systems such as laptops, cell phones, automobiles, TVs, home electrical and security systems, gaming consoles, and environmental sensing devices are being connected to the internet, making the term “computer network” out-of-date; all these devices are referred to as or The goal of computer network is to provide the end systems (users) with some services 3
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Shahin Nazarian/EE450/Summer 2010 Computer Network (Cont.) The computer network has hosts and routers ( , , or ) as nodes in its graph model These nodes are interconnected using transmission facilities Coaxial , twisted-pair copper , optics, microwave , _____ channels and satellite channels are examples of transmission facilities 4 Home network Institutional network Mobile network Global ISP* Regional ISP * ISP (Internet Service Provider)
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Shahin Nazarian/EE450/Summer 2010 Network Topology In computer networking, refers to the layout of connected devices Network topologies are categorized into , , , line, tree, [partially connected] and fully-connected [mesh] Note that topology is not about how the devices operate) 5 Bus Ring Star
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Shahin Nazarian/EE450/Summer 2010 Network Topology (Cont.) [Partially connected] 6 [Partially Connected] Mesh Tree Fully Connected [Mesh]
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Shahin Nazarian/EE450/Summer 2010 Network Topology (Cont.) For the following 6 nodes in a fully-connected topology (point-to-point connection) the number of connections is ________ How often each of those connections are used? Fully-connected may be very inefficient if many of them are rarely used Fully connected topology may still be practical only for small networks such as the home networks 7 Fully Connected (5 nodes) Fully Connected (6 nodes)
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Shahin Nazarian/EE450/Summer 2010 Network Topology (Cont.) 8 Note that there are 100s of millions of end systems that could be too far apart and connecting them fully will not be feasible Also note that the nodes (computers) are becoming less costly, but the trend for the physical transmission facilities such as cables is upward, therefore the cost of connection is becoming relatively _______ Fully Connected (5 nodes)
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Shahin Nazarian/EE450/Summer 2010 A Star Topology Connecting 4 stations 9
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Shahin Nazarian/EE450/Summer 2010 A Bus Topology Connecting 3 Stations
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Shahin Nazarian/EE450/Summer 2010 A Ring Topology Connecting 6 Stations
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Shahin Nazarian/EE450/Summer 2010 A _____ backbone with three ____ networks A Hybrid Topology
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Shahin Nazarian/EE450/Summer 2010 Network Computer A network computer can either provide service or request service A ______ is a service requester A ______ is a service provider (always ON) providing access to network resources. A server
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This note was uploaded on 09/27/2010 for the course EE 450 taught by Professor Zahid during the Summer '06 term at USC.

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EE450-U0-Introduction_Lecture-Nazarian-Summer10 - EE450...

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