Creating a network app Write programs that application transport run on different end network data link systems and physical *communicate over a network. e.g.,Web:Web server soffware communicates with browser software little software written for devices in network core application application transport network core devices do fransport network network data link not run user application data link physical physical code application on end systems allows for rapid app development,propagation 2:Application Layer 52: Application Layer 5 Creating a network app Write programs that v run on different end systems and v communicate over a network. v e.g., Web: Web server software communicates with browser software little software written for devices in network core v network core devices do not run user application code v application on end systems allows for rapid app development, propagation application transport network data link physical application transport network data link physical application transport network data link physical