Application Layer Functionality and Protocols

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10/11/07 10:11 AM Page 63. CHAPTER 3. Application Layer Functionality and Protocols Objectives Upon completion of this chapter, you will be able to answer the following questions: How do the functions of the three upper OSI What are the file-sharing processes that use model layers provide network services to peer-to-peer applications and the Gnutella end-user applications ? protocol? How do the TCP/IP Application Layer Protocols How do Protocols ensure that services running provide the services specified by the upper on one kind of device can send to and receive layers of the OSI model? from many different network devices?

Application software:Applications are the software programs used by people to com-municate over the network. Examples of application software, including HTTP, FTP,

  Applications, Software, Early, Application layer