Application Layer Functionality and Protocols

chapter 3 Application 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 ? How do Protocols ensure that services runningon one kind of device can send to and receivefrom many different network devices? How can you use network analysis tools toexamine and explain how common user applications work?

communication across the information network possible. Applications: The Interface Between the Networks This section introduces two important concepts: Application layer:The application layer of the OSI model provides the first step of getting data onto the network. Chapter 3: Application Layer Functionality and Protocols 65 Application

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