Transcription of Application Layer Functionality and Protocols
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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)?
64 Network Fundamentals, CCNA Exploration Companion Guide 04_20870ch03.qxd 10/11/07 10:11 AM Page 64 The world experiences the Internet through the use of the World Wide Web, e …
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