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Application Layer Functionality And Protocols - Network Fundamentals � Chapter 3 - Document preview page 1

Application Layer Functionality And Protocols - Network Fundamentals � Chapter 3 - Page 1

Document preview content for Application Layer Functionality And Protocols - Network Fundamentals � Chapter 3

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.

Benjamin Fisher
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Application Layer Functionality And Protocols - Network Fundamentals � Chapter 3 - Page 1 preview image© 2007 Cisco Systems, Inc. All rights reserved.Cisco Public1Version 4.0Application LayerFunctionality andProtocolsNetwork Fundamentals–Chapter 3
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Application Layer Functionality And Protocols - Network Fundamentals � Chapter 3 - Page 2 preview image2© 2007 Cisco Systems, Inc. All rights reserved.Cisco PublicObjectives▪Define the application layer as the source anddestination of data for communication acrossnetworks.▪Explain the role of protocols in supportingcommunication between server and clientprocesses.▪Describe the features, operation, and use ofwell-known TCP/IP application layer services(HTTP, DNS, SMTP).
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Application Layer Functionality And Protocols - Network Fundamentals � Chapter 3 - Page 3 preview image3© 2007 Cisco Systems, Inc. All rights reserved.Cisco PublicApplications–The Interface Between Human and Data Networks▪Explain that applications provide the means for generating andreceiving data that can be transported on the network
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Application Layer Functionality And Protocols - Network Fundamentals � Chapter 3 - Page 4 preview image4© 2007 Cisco Systems, Inc. All rights reserved.Cisco Public4OSI and TCP/IP Models–Application Layer▪The Application layer, Layer seven, is the top layerof both the OSI and TCP/IP models.▪It provides the interface between the applicationswe use to communicate and the underlying networkover which our messages are transmitted.▪Application layer protocols are used to exchangedata between programs running on the source anddestination hosts.▪There are many Application layer protocols andnew protocols are always being developed
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Application Layer Functionality And Protocols - Network Fundamentals � Chapter 3 - Page 5 preview image5© 2007 Cisco Systems, Inc. All rights reserved.Cisco PublicApplications–The Interface Between Human and Data Networks▪Explain the role of applications, services and protocols inconverting communication to data that can be transferred acrossthe data network
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Application Layer Functionality And Protocols - Network Fundamentals � Chapter 3 - Page 6 preview image6© 2007 Cisco Systems, Inc. All rights reserved.Cisco Public▪The most widely-known Application layer protocols arethose 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-mail6
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Application Layer Functionality And Protocols - Network Fundamentals � Chapter 3 - Page 7 preview image7© 2007 Cisco Systems, Inc. All rights reserved.Cisco PublicApplications–The Interface Between Human and Data Networks▪Define the separate roles applications, services and protocols playin transporting data through networks
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Application Layer Functionality And Protocols - Network Fundamentals � Chapter 3 - Page 8 preview image8© 2007 Cisco Systems, Inc. All rights reserved.Cisco PublicApplication Layer Software▪Within the Application layer, there aretwo forms ofsoftware programs or processesthat provide access tothe network.▪1) Network-Aware Applications: Some end-userapplications are network-aware, meaning that theyimplement the application layer protocols and are able tocommunicate directly with the lower layers of the protocolstack. Ex: Email client, web browser8
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Application Layer Functionality And Protocols - Network Fundamentals � Chapter 3 - Page 9 preview image9© 2007 Cisco Systems, Inc. All rights reserved.Cisco Public▪2) Application layer Services: Other programs mayneed the assistance of Application layer services to usenetwork resources, like file transfer or network printspooling.▪Each application or network service uses protocols whichdefine the standards and data formats to be used.Without protocols, the data network would not have acommon way to format and direct data9Application Layer Software
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