Networking lectures - Core Network

May 11th, 2015
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a) Why is the transport layer not present inside the core network? Marks 3 ● Core Network is the internetworking of routers. ● Transport layer deals with communication between applications. ● The transport layer is not present because it provides additional functions to the core network to compensate for the limitation of the core network layer. ○

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Networking Lectures 1 to 4Data Communication and Network Comps Assignment 1 Khoa Le - s3103004 Question 1.a)Whyisthetransportlayernotpresentinsidethecorenetwork? Marks3 CoreNetworkistheinternetworkingofrouters. Transportlayerdealswithcommunicationbetweenapplications. Thetransportlayerisnotpresentbecauseitprovidesadditionalfunctionstothe corenetworktocompensateforthelimitationofthecorenetworklayer. InthecaseofTCP/IPprotocol,theTransportLayerprovidemorecomplex servicessuchasflowcontrolorconnectionorienteddatastreamtransferto increasethereliabilityofthedataasitissentthroughthenetwork. Bykeepingtheselayersseparate,thetransportlayerisabletoprovideauniform networkinginterfacewheretheactualtopologyoftheunderlyingnetworkcanbe hidden.Thisallowsservicessuchasflowcontrol,errordetection/correctionand connectionprotocolssuchasTCPtoexist. b)Whiletransportlayerprovidesreliableprocesstoprocessmessagedeliveryand errorrecovery,errorcontrolisalsoofferedinthedatalinklayer.Supposethe transmissionchannelsbecomevirtuallyerrorfree.Isthedatalinklayerstill needed? Marks3 Ifthetransmissionchannelbecomesvirtuallyerrorfree,theerror

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