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EE450-U0-Introduction-short-Nazarian-Summer11

EE450-U0-Introduction-short-Nazarian-Summer11 - EE450...

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EE450 Computer Networks Introduction Shahin Nazarian Summer 2011
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Shahin Nazarian/EE450/Summer 2011 Network 2 nodes l links
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Shahin Nazarian/EE450/Summer 2011 Computer Network What is a computer network? What is Internet? A computer network is a collection of computers and devices connected to each other All these devices are referred to as or The goal of computer network is to provide the end systems (users) with some services Internet is the network of network; a computer network that interconnects hundreds of millions of computing devices throughout the world 3
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Shahin Nazarian/EE450/Summer 2011 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 2011 Network Topology In computer networking, refers to the layout of connected devices Note that topology is not about how the devices operate) 5 Bus Ring Star
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Shahin Nazarian/EE450/Summer 2011 Network Topology (Cont.) [Partially connected] 6 [Partially Connected] Mesh Tree Fully Connected [Mesh]
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Shahin Nazarian/EE450/Summer 2011 Network Topology (Cont.) 7 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 2011 A Star Topology Connecting 4 stations 8
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Shahin Nazarian/EE450/Summer 2011 A Bus Topology Connecting 3 Stations
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Shahin Nazarian/EE450/Summer 2011 A _____ backbone with three ____ networks A Hybrid Topology
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Shahin Nazarian/EE450/Summer 2011 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 provides service to multiple clients Note that clients and servers are pieces of ______; the machines that these softwares are running in, are referred to as clients and servers, respectively 11
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Shahin Nazarian/EE450/Summer 2011 Client/Server Model client/server Client host requests, and receives service from always-_____ server Example - WWW: Web browser/server. Client is a web browser, and the destination is a web server which responds to client’s inquiry, say summer.html by sending the html file to client Example – Email client/ server 12
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Shahin Nazarian/EE450/Summer 2011 Peer-to-Peer Model
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