computer networks

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cnset01.ppt 1 524 computer networks section 1: introduction to course dr. e.c. kulasekere sri lanka institute of information technology - 2005 course outline – the aim n the course is design to establish the terminology and concepts of computer networks and the associated communication environment. n on the successful completion of the course, the student should be able to: q understand and describe the concepts related to the different osi layers. q understand and describe the internal mechanisms of different network topologies and architectures and their relevance to data transmission systems. 2 course outline n introduction n physical layer n data link layer n network layer n transport and application layers n security and other issues. text books n main text q data communications and networking/3e behrouz a. forouzan. tata mcgraw hill, 2004 n other text q data and computer communications/7e william stallings, pearson education inc. 2004 3 grading policy …

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pology: star mesh etc. 6 types of connections n point to point provides a dedicated link between the sender and the receiver. n multipoint or multidrop shares the medium. need to look at techniques of sharing etc. (mac) physical topology 7 the mesh topology n dedicated point to point link to every other device. hence high security for data. each link is dedicated hence no congestion problems, also one link down does not mean the system fails. n for n devices it has n(n-1)/2 channels to link and each device needs to have (n-1) i/o ports to do this. too expensive. the star topology n less expensive compared to mesh since only one link and one i/o port is required to send data to a central location. reconfiguration is easy. if one link fails the system does not fail n if the hub fails, all fail. link is through a …

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or internetworking. 12 the internet network models n the requirements of a model. n to models we will be concentrating on. q the internet model q the osi model n the layered model provides guidelines for the development of universally compatible networking protocols. 13 the design of layered architecture the internet model layers 14 layers, services and protocols n the overall communications process between two or more machines connected across one or more networks is very complex n layering partitions related communications functions into groups that are manageable n each layer provides a service to the layer above n each layer operates according to a protocol example of http access 15 protocols n a protocol is a set of rules that governs how two or more communicating entities in a layer are to interact n messages that can be sent and received n actions that are to be taken when …

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er data link layer functions n the dll is responsible for transmitting frames from one node to another. this is a hop to hop process. n this layer makes the physical layer appear error free to the upper layer. n the major duties included are q framing q physical addressing. q flow and error control q access control 19 illustration of a hop-to-hop delivery the network layer 20 network layer functions n the network layer is responsible for the delivery of packets from the original source to the final destination. this again is a hop to hop process. n if the two systems are connected to the same link, there is no need of a network layer since we know where it has to be delivered. n addressing and routing are the major operations in this layer. illustration of source to destination delivery of a packet 21 example of network …

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the address of the receiving process). since the data size is larger than the network layer can handle, the data are split into two packets, each packet retaining the port addresses (j and k). then in the network layer, network addresses (a and p) are added to each packet. example of transport layer function 24 the application layer application layer functions n the application layer is responsible for providing services to the user. n major duties are q mail services q ftp access q remote login q accessing the www q any other applications. 25 summary of layers in the internet model the osi model 26 headers and trailers

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cnset01.ppt 1 524 computer networks section 1: introduction to course dr. e.c. kulasekere sri lanka institute of information technology - 2005 course outline – the aim n the course is design to establish the terminology and concepts of computer networks and the associated communication environment. n on the successful completion of the course, the student should be able to: q understand and describe the concepts related to the different osi layers. q understand and describe the internal mechanisms of different network topologies and architectures and their relevance to data transmission systems. 2 course outline n introduction n physical layer n data link layer n network layer n transport and application layers n security and other issues. text books n main …

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