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Application Layer Functionality And Protocols - Network Fundamentals � Chapter 3

An explanation of application layer protocols in network communications, focusing on functionality and real-world applications.

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    © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 1 Version 4.0 Application Layer Functionality and Protocols Network Fundamentals – Chapter 3

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    2 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Objectives ▪ Define the application layer as the source and destination of data for communication across networks. ▪ Explain the role of protocols in supporting communication between server and client processes. ▪ Describe the features, operation, and use of well - known TCP/IP application layer services (HTTP, DNS, SMTP).

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    3 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Applications – The Interface Between Human and Data Networks ▪ Explain that applications provide the means for generating and receiving data that can be transported on the network

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    4 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 4 OSI and TCP/IP Models – Application Layer ▪ The Application layer, Layer seven, is the top layer of both the OSI and TCP/IP models. ▪ It 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. ▪ There are many Application layer protocols and new protocols are always being developed

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    5 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Applications – The Interface Between Human and Data Networks ▪ Explain the role of applications, services and protocols in converting communication to data that can be transferred across the data network

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    6 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public ▪ The most widely - known Application layer protocols are those that provide for the exchange of user information. - Domain Name Service Protocol ( DNS ) - Hypertext Transfer Protocol ( HTTP ) - Telnet, a terminal emulation protocol - File Transfer Protocol ( FTP ) ▪ ( SMTP, POP ) E - mail 6

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    7 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Applications – The Interface Between Human and Data Networks ▪ Define the separate roles applications, services and protocols play in transporting data through networks

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    8 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Application Layer Software ▪ Within the Application layer, there are two forms of software programs or processes that provide access to the network. ▪ 1) Network - Aware Applications : Some end - user applications are network - aware, meaning that they implement the application layer protocols and are able to communicate directly with the lower layers of the protocol stack. Ex: Email client, web browser 8

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    9 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public ▪ 2) Application layer Services : Other programs may need the assistance of Application layer services to use network resources, like file transfer or network print spooling. ▪ Each application or network service uses protocols which define the standards and data formats to be used. Without protocols, the data network would not have a common way to format and direct data 9 Application Layer Software

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