CH10 - Chapter 10: Application Layer Introduction to...

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Introduction to Networks v5.1Chapter 10:Application Layer
© 2013 Cisco and/or its affiliates. All rights reserved.Cisco Public210.0 Introduction10.1 Application Layer Protocols10.2 Well-Known ApplicationLayer Protocols and Services10.3 Summary
© 2013 Cisco and/or its affiliates. All rights reserved.Cisco Public3Upon completion of this section, you should be able to:Explain how the functions of the application layer, session layer, andpresentation layer work together to provide network services to end userapplications.Explain how common application layer protocols interact with end userapplications.
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© 2013 Cisco and/or its affiliates. All rights reserved.Cisco Public5The application layer is closest to the end user.Network applications enable users to send and receive data with ease.The application layer acts as interface between the applications and theunderlying network.Application layer protocols helpexchange data between programsrunning on the source anddestination hosts.The TCP/IP application layerperforms the functions of the upperthree layers of the OSI model.Common application layer protocolsinclude: HTTP, FTP, TFTP, DNS.
© 2013 Cisco and/or its affiliates. All rights reserved.Cisco Public6The presentation layer has three primary functions:oFormat dataoCompress dataoEncrypt dataCommon standards for video include QuickTime and Motion PictureExperts Group (MPEG).Common graphic image formats are:Graphics Interchange Format (GIF)Joint Photographic Experts Group (JPEG)Portable Network Graphics (PNG) format
© 2013 Cisco and/or its affiliates. All rights reserved.Cisco Public7The session layer creates and maintains dialogs between source anddestination applications.The session layer handles the exchange of information to initiatedialogs, keep them active, and to restart sessions that are disrupted oridle for a long period of time.
© 2013 Cisco and/or its affiliates. All rights reserved.Cisco Public8TCP/IP application protocols specify the format and control informationnecessary for common Internet functions.Application layer protocols must be implemented in both the source anddestination devices.Application layer protocols implemented on the source and destinationhost must be compatible to allow communication.
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© 2013 Cisco and/or its affiliates. All rights reserved.Cisco Public10The device requesting the information is called a client.The device responding to the request is called a server.Client and server processes are considered to be in the application layer.

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Term
Fall
Professor
Tim Stroth
Tags
Chapter 10, E mail, IP address, Domain Name System, Cisco Public

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