Chapter 3 Application Layer Functionality and Protocols .Overview Describe how the functions of the three upper OSI model layers provide network services to end user applications. Describe how the TCP/IP Application Layer protocols provide the services specified by the upper layers of the OSI model. Define how people use the Application Layer to communicate acrossthe information network. Describe the function of well-known TCP/IP applications, such as the World Wide Web and email, and their related services (HTTP, DNS,SMB, DHCP, STMP/POP, and Telnet). Describe file-sharing processes that use peer-to-peer applications and the Gnutella protocol. Explain how protocols ensure services running on one kind.
