Application Layer Functionality and Protocols

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CHAPTER 3Application Layer Functionality and ProtocolsObjectivesUpon completion of this chapter, you will be able to answer the following questions: How do the functions of the three upper OSImodel layers provide network services to end-user applications ? How do the TCP/IP Application Layer protocolsprovide the services specified by the upper layers of the OSI model? How do people use the Application Layer to communicate across the information network? What are the functions of well-known TCP/IPapplications, such as the World Wide Web and e-mail, and their related services (HTTP, DNS,DHCP, STMP/POP, and Telnet)? What are the file-sharing processes that usepeer-to-peer applications and the Gnutella protocol?

The application layer prepares human communication for transmission over the data network. 3. Software and hardware convert communication to a digital format. 4. Application layer services initiate the data transfer. 5. Each layer plays its role. The OSI layers encapsulate data down the stack. Encapsulated data travels across the media to the ...

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