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)?

Encryption of the data for transmission and decryption of data upon receipt by the des-tination Presentation layer implementations are not typically associated with a particular protocol stack. The standards for video and graphics are examples. Some well-known standards for video include QuickTime and Motion Picture Experts Group (MPEG).

  Applications, Early, Encryption, Application layer