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? How do Protocols ensure that services runningon one kind of device can send to and receivefrom many different network devices?

68 Network Fundamentals, CCNA Exploration Companion Guide 04_20870ch03.qxd 10/11/07 10:11 AM Page 68. Application Layer Software The functions associated with the application layer protocols in both the OSI and the TCP/IP models enable the human network to interface with the underlying data network.

  Applications, Network, Ccna, Fundamentals, Early, Network fundamentals, Application layer