The University of SydneyPage 11Internet protocol stack–application:supporting network applications–FTP , SMTP , HTTP–transport:process-process data transfer–TCP, UDP–network:routing of datagrams from source to destination–IP , routing protocols–link:data transfer between neighboring network elements–Ethernet, 802.111 (WiFi), PPP–physical:bits “on the wire”applicationtransportnetworklinkphysical