chap3 - Objectives In this chapter, you will learn to:...

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© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public ITE 1 Chapter 6 1 Objectives In this chapter, you will learn to: Describe how the functions of the three upper OSI model layers provide network services to end user applications. Describe how the TCP/IP Application Layer protocols provide the services specified by the upper layers of the OSI model. Define how people use the Application Layer to communicate across the information network. Describe the function of well-known TCP/IP applications, such as the World Wide Web and email, and their related services (HTTP, DNS, SMB, DHCP, SMTP/POP, and Telnet). Describe file-sharing processes that use peer-to-peer applications and the Gnutella protocol. Explain how protocols ensure services running on one kind of device can send to and receive data from many different network devices. Use network analysis tools to examine and explain how common user applications work.
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public ITE 1 Chapter 6 2 OSI and TCP/IP Model The Open Systems Interconnection reference model is a layered, abstract representation created as a guideline for network protocol design. The OSI model divides the networking process into 7 logical layers, each of which has unique functionality and to which are assigned specific services and protocols. •In the OSI model, information is passed from one layer to the next, starting at the Application layer down the hierarchy to the Physical layer, then passing over the communications channel to the destination host, where the information proceeds back up the hierarchy, ending at the Application layer.
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public ITE 1 Chapter 6 3 OSI and TCP/IP Model: The Application Layer The Application layer , Layer seven, is the top layer of both the OSI and TCP/IP models. –It is the layer that provides the interface between the applications we use to communicate and the underlying network over which our messages are transmitted. –Application layer protocols are used to exchange data between programs running on the source and destination hosts. The TCP/IP protocol suite was developed prior to the definition of the OSI model, The TCP/IP application layer protocols fit roughly into the framework of the top three layers of the OSI model: Application, Presentation and Session layers . •Most TCP/IP application layer protocols were developed before the emergence of personal computers, and graphical user interfaces. As a result, these protocols implement very little of the functionality that is specified in the OSI model Presentation and Session layers.
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public ITE 1 Chapter 6 4 OSI and TCP/IP Model: The Presentation Layer The Presentation Layer has three primary functions: Coding and conversion of Application layer data to ensure that data from the source device can be interpreted by the appropriate application on the
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This note was uploaded on 02/12/2012 for the course NETWORKING NETW204 taught by Professor Baig during the Spring '09 term at DeVry Addison.

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chap3 - Objectives In this chapter, you will learn to:...

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