14-TL-Intro - Introduction to Transport Layer Web Browser...

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Introduction to Transport Layer
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Transport Layer: Motivation A B R1 R2 Recall that NL is responsible for forwarding a packet from one HOST to  another HOST But it is the applications that communicate! How do you make applications on HOSTs to communicate? Need a new layer, called the  “Transport Layer” Responsible for providing communication between applications running in different  hosts A Web Browser talking to a Web Server Network Link Physical Network Link Physical Network Link Physical Network Link Physical C Network Link Physical Transport Network Link Physical Transport Network Link Physical Transport Network Link Physical FTP Server Web Server Web Browser FTP Client
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Transport services and protocols provide  logical communication  between  app processes  running on different hosts transport protocols run in end systems  send side : breaks app messages into  segments , passes to  network layer rcv side : reassembles segments into 
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