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Transport Layer

Transport Layer - Computer Networks 2 The Transport Layer...

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February 13, 2012 Veton K ë puska 1 Computer Networks 2 The Transport Layer
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February 13, 2012 Veton Këpuska 2 The Transport Layer It is the heart of the whole protocol hierarchy. Its task is to provide: Efficient Reliable Cost-effective, data transport  from source machine to the destination machine Details of Transport Layer covered: Services Design Protocols Performance
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February 13, 2012 Veton Këpuska 3 The Transport Service Transport Layer Provides Services to Application  Layer. Kind of service provided to Application layer will  be presented next. Services Provided to the Upper Layers: Efficient, Reliable, and cost-effective service to its users  (typically processes in the application layer). To achieve this goal Transport Layer makes use of  services provided by Network Layer.
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February 13, 2012 Veton Këpuska 4 Services Provided to the Upper Layers: Transport Entity: Hardware and/or Software within  transport layer that does the work. It can be located in: Operating System Kernel Separate User Process Library Package for Network Applications Network Interface card. Relationship of Network, Transport and  Application Layers is illustrated in the next Figure. 
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February 13, 2012 Veton Këpuska 5 The Network, Transport and Application  Layer 
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February 13, 2012 Veton Këpuska 6 Types of Transport Service Connection-Oriented Service Connectionless-Oriented Service Both services have 3 phases: Establishment Data Transfer Release Those services are similar to corresponding Network layer  services. They are similar in: Addressing, and  Flow Control
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February 13, 2012 Veton Këpuska 7 The Transport Service If the services of Transport layer are similar to Network layer services  then why there are those two distinct layers in network protocol  architecture? 1. Transport Layer runs entirely on the users machines. 2. Network Layer mostly runs on the routers (Operated by Carriers). What happens if Network Layer offers inadequate Service? Frequently lost packets. Routers crashes, etc. => Problems in delivery and communication. Transport layer has to deal with those problems without having real  control over the network layer: It can not resort to improving the service by using: Better Routers, More robust error handling of Data Link Layer, etc.
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February 13, 2012 Veton Këpuska 8 The Transport Service Transport Entity - in connection-oriented subnet: If a transmission has been abruptly terminated halfway, and   There is no indication of what has happened to the data  currently in transit,  then transport service can:
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