Transport services and protocols application transport provide logical communication mob network data link between application processes national or global ISP running on different hosts logica transport protocols actions in end systems: local or sender:breaks application messages end-end transport into segments,passes to network layer home network receiver:reassembles segments into messages,passes to application layer network two transport protocols available to data link physical Internet applications enterprise ·TCP,UDP network Transport Layer:3-4Transport services and protocols ▪ provide logical communication between application processes running on different hosts mobile network home network enterprise network national or global ISP local or regional ISP datacenter network content provider network application transport network data link physical application transport network data link physical ▪ transport protocols actions in end systems: • sender: breaks application messages into segments, passes to network layer • receiver: reassembles segments into messages, passes to application layer ▪ two transport protocols available to Internet applications • TCP, UDP Transport Layer: 3-4