EE450-U2-Protocols&Layering_Lecture-Nazarian-Summer10

EE450-U2-Protocols&Layering_Lecture-Nazarian-Summer1...

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University of Southern California Viterbi School of Engineering EE450 omputer Networks Computer Networks etwork Protocols and Layering Network Protocols and Layering Shahin Nazarian Summer 2010
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An Example a Human Protocol: Tasks Involved in Sending a Letter Shahin Nazarian/EE450/Summer 2010 2
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What is a Protocol? h m t l m t t k t l Hi CP connection a human protocol a computer network protocol Hi ot the TCP connection request TCP connection sponse Got the time? 2:00 response Get http://www.awl.com/kurose-ross < ile> A protocol can be defined as the rules, conventions, standards overning the syntax semantics and synchronization of file time governing the syntax, semantics, and synchronization of communication. Another words, protocols are sets of rules, (or a sequence of events) that control or enable (preferably reliable and) recognizable transfer of information among communication end Shahin Nazarian/EE450/Summer 2010 points Protocols can be implemented by _____, _____, or ______ 3
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Protocol Note that protocol represents an agreement among communication devices. Without a protocol devices may be connected but not communicating Protocols are devised such that the system including ll its hardware and software products (which in all its hardware and software products (which in general are from different vendors) will be able to operate as long as they adhere to the standards in he protocol the protocol This guarantees marketability for vendor products ne main shortcoming of a protocol is that it takes One main shortcoming of a protocol is that it takes a long time to be devised and standardized, therefore by the time the protocol is ready to be Shahin Nazarian/EE450/Summer 2010 4 commercialized, the technology may be outdated
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ISO and OSI and The International International Standards Standards Organization Organization ( ISO ) i sa multinational body dedicated to worldwide agreement on international standards ISO was established in 1947 An ISO ISO standard that covers all aspects of network communications is the ____ ____ Systems Systems Interconnection Interconnection ( OSI ) mode l OSI was first introduced in the late 1970s SO is the organization OSI is the model Shahin Nazarian/EE450/Summer 2010 5 ISO is the organization, OSI is the model
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Network Expectations and Goals From the user point of view (application programmer or end User: network delivery should be reliable, and recognizable and in a reasonable (and predictable) time he network designer looks for cost- ffective designs The network designer looks for cost effective designs to make the design affordable; and makes sure the resources such the CPUs, memories and bandwidth re efficiently and fairly used are efficiently and fairly used The network provider cares about billing issues, implicity of use, straightforward fault detection and simplicity of use, straightforward fault detection and isolation (i.e., the faults that force down the network.) It also cares about administrative and anagement issues Shahin Nazarian/EE450/Summer 2010 6 management issues
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EE450-U2-Protocols&amp;amp;Layering_Lecture-Nazarian-Summer1...

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