1Application LayerLecture 13aELEC300U*The slides are adapted from ppt slides (in substantially unaltered form) available from “Computer Networking: A Top-Down Approach,” 4thedition, by Jim Kurose and Keith Ross, Addison-Wesley, July 2007. Part of the materials are also adapted from ELEC315 and MIT 6.02 course notes. •A brief discussion of transport-layer protocols – TCP, UDP•Key application-layer concepts•DNS•Web and HTTP
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2Internet protocol stack•application:supporting network applications•HTTP, SMTP, FTP, DNS•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•802.11, Ethernet•physical:bits “on the wire”ApplicationTransportNetworkLinkPhysical