Overview - Course Overview EE450 Introduction to Computer...

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A.Zahid-EE450 1 Course Overview EE450: Introduction to Computer Networks Professor A. Zahid
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A.Zahid-EE450 2 Course Overview Part 1: Data Communications & Networking Part 2: Computer Networking Protocols (TCP/IP) Part 3: Wide Area Networks (WANs) Part 4: Local Area Networks (LANs) Part 5: Internetworking Part 6: Transport Layer Protocols Part 7: Network Applications Part 8: Network Security
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A.Zahid-EE450 3 Simple Data Communications Model
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A.Zahid-EE450 4 Components of the Model Source – Generates data to be transmitted Transmitter – Converts data into transmittable signals Transmission System/Media – Carries the transmitted signal Receiver – Converts received signal into data Destination – Takes incoming data
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A.Zahid-EE450 5 Key Communications Tasks Transmission System Utilization Interfacing Signal Generation Synchronization Exchange Management Error detection and correction Addressing and routing Recovery Message formatting Security Network Management
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A.Zahid-EE450 6 Computer Networks • 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 Do we need networking? Yes we do! Point-to-point communication is not practical! – Devices are too far apart – Large set of devices would need impractical number of connections. See illustration next chart
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A.Zahid-EE450 7 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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A.Zahid-EE450 8 Multimedia Convergence Network Telephone companies (telco) Internet Service Providers (ISP) Networking Computer Hardware/Software Telco/wireless Hardware Video - pre-recorded / on-demand (e.g., MPEG, RealNet) - live (video phone, video teleconference) Broadcast TV Film Data - e-mail - files -- executables -- source code -- data -- html -- image Computer Software Financial, eCommerce, etc. Major industries Recording Broadcast Radio Voice / Audio - pre-recorded /on-demand (streaming or file [mp3]) - live (RealNet, VoIP) PDA Cellphone Pager Wireless
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A.Zahid-EE450 9 Servers, Clients and Peers A network computer can either provide service or request service • A server is a service provider, providing access to network resources • A Client is a service requester • 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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A.Zahid-EE450 10 Server Roles Servers can assume several roles and a single server could also have several roles Examples of Servers include: File Servers : Manages user access to shared files Print Servers : Manages user access to print resources Application Servers : Similar to FS with some processing Mail Servers : Manages electronic messages between users
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