Transport services and protocols o provide logical communication lication between app processes running on different hosts data link networ data link o transport protocols run in end systems a transport vs network layer be, physical i network data link services. physical o network layer: data transfer 受 between end systems g transport layer: data application transfer between processes networ data link o relies on, enhances network ayer services 3: Transport Layer 3a-23: Transport Layer 3a-2 Transport services and protocols  provide logical communication between app’ processes running on different hosts  transport protocols run in end systems  transport vs network layer services:  network layer: data transfer between end systems  transport layer: data transfer between processes  relies on, enhances, network layer services application transport network data link physical application transport network data link physical network data link physical network data link physical network data link physical network data link network physical data link physical