Transport services and protocols application provide logical transport network data link o communication between physical app processes running on different hosts transport protocols run in end systems send side:breaks app logical end-end transport messages into segments,passes to network layer app cation transport network -rcv side:reassembles data lin segments into messages,passes to app layer more than one transport protocol available to apps Transport Layer 3-4Transport Layer 3-4 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 messages, passes to app layer  more than one transport protocol available to apps application transport network data link physical logical end-end transport application transport network data link physical