Part_1_Overview

Part_1_Overview - Overview EE450 Introduction to Computer...

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EE450, USC, Zahid 1 Overview EE450: Introduction to Computer Networks Professor A. Zahid
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EE450, USC, Zahid 2 Course Overview z Part 1: Data Communications & Networking z Part 2: Computer Networking Protocols (TCP/IP) z Part 3: Wide Area Networks (WANs) z Part 4: Local Area Networks (LANs) z Part 5: Internetworking z Part 6: Transport Layer Protocols z Part 7: Network Applications
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EE450, USC, Zahid 3 Simple Data Communications Model
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EE450, USC, Zahid 4 Key Data Communications Tasks z Interfacing z Signal Generation z Synchronization z Exchange Management z Error detection and correction z Addressing and routing z Recovery z Message formatting z Security z Network Management z Many more…
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EE450, USC, Zahid 5 Computer Network z A Computer Network is a set of nodes such as routers, switches, hosts, etc.. interconnected via transmission facilities such as copper, cable, fiber, satellite, radio, microwave, etc.. for the purpose of providing services to end systems/users z Do we need networking? Yes we do! z Point-to-point communication is not practical! z Devices are too far apart z Large set of devices would need impractical number of connections. See illustration next chart
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EE450, USC, Zahid 6 Example: Telephone Network Fully-Connected Mesh # of FDX links = N(N-1)/2 e.g., N=6; 6(5)/2=15 links Total # ports = N(N-1) e.g., N=6; 6(5)=30 ports Central Office (CO) With Central Office # of FDX links = N e.g., N=6; 6 links Total # of ports = N e.g. N=6, 6 ports
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EE450, USC, Zahid 7 Multimedia Convergence Network Telephone companies (Telco) Internet Service Providers (ISP) Computer Hardware/Software Telco/wireless Hardware Video - pre-recorded / on-demand (e.g., MPEG, Real Net) - live (video phone, video teleconference) Broadcast TV Film Data - e-mail - files -- executables -- source code -- data -- html -- image Computer Software Financial, e-Commerce, etc. Major Industries Recording Broadcast Radio Voice / Audio - pre-recorded /on-demand (streaming or file [mp3]) - live (Real Net, VoIP) PDA Cell phone Pager Wireless
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EE450, USC, Zahid 8 Clients, Servers and Peers z A network computer can either provide service or request service z A server is a service provider, providing access to network resources z A Client is a service requester z A Peer-to-Peer network does not have a dedicated server. All computers are equal and they both provide and request services.
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EE450, USC, Zahid 9 Server Roles z Servers can assume several roles and a single server could also have several roles z Examples of Servers include: z File Servers: Manages user access to shared files z Print Servers: Manages user access to print resources z Application Servers: Similar to FS with some processing z Mail Servers: Manages electronic messages between users z Communications (Remote Access) Servers: Manages data flow and e-messages from one network to another z Web Servers: Runs WWW and FTP servers for access via the Internet/Intranet z Directory (DNS) Servers: Locates information about networks such as domains.
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EE450, USC, Zahid 10 Client/Server Model Client (web browser) -source- Network Server (web server) -destination- html file image file Example: World Wide Web Request (GET index.html) Response (HTML file gif, jpeg, ..
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