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Layers of the OSI Reference Model
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Layer 7:The Application Layer
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The seventh layer, or topmost layer, of the OSI Reference Model is the application layer It provides the interface that a person uses to interact with the application This interface can be command-line based or graphics-based Cisco Internetwork Operating System (IOS) routers and switches use a command-line interface (CLI), whereas a web browser uses a graphical interface Cisco routers also have a graphical user interface, called Security Device Manager (SDM), which is introduced in 18 Note that in the OSI Reference Model, the application layer refers to applications that are network-aware Of the thousands of existing computer applications, not all can transmit information across a network This situation is changing rapidly, however In the 1990s, a distinct line existed between applications that could and couldn t perform network functions A good example of this was word processing programs, such as Microsoft Word, which were built to perform one process: word processing Today, however, many applications Microsoft Word, for instance have embedded objects that don t necessarily have to be located on the same computer There are many, many examples of application layer programs The most common are telnet and Secure Shell (SSH), File Transfer Protocol (FTP), web browsers, and e-mail You should realize that the applications themselves are not what the OSI Reference Model s application layer is about: the application layer provides a means for the applications to realize that a network is there and to take advantage of it In other words, the application layer encompasses the protocols and services that the applications will employ to access network resources
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The top (seventh) layer of the OSI Reference Model is the application layerThis layer provides the protocols and services applications need to take advantage of a network Examples of
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TCP/IP applications include telnet, FTP, Hypertext Transfer Protocol (HTTP for web browsing), Post Of ce Protocol 3 (POP3), and Simple Mail Transfer Protocol (SMTP)
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Layer 6:The Presentation Layer
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The sixth layer of the OSI Reference Model is the presentation layer The presentation layer is responsible for defining how information is transmitted and presented to the user in the interface that he or she is using This layer defines how various forms of text, graphics, video, and/or audio information is transmitted and used correctly
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2: OSI Reference Model
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by the application layer For example, text is represented in primarily two different forms: ASCII and EBCDIC ASCII (the American Standard Code for Information Interchange, used by most devices today) uses 7 bits to represent characters EBCDIC (Extended Binary-Coded Decimal Interchange Code, developed by IBM) is still used in mainframe environments to represent characters Text can also be shaped by different elements, such as font, underline, italic, and bold Many different standards are used for representing graphical information BMP, GIF, JPEG, TIFF, and others This variety of standards is also true of audio (WAV and MIDI, for example) and video (WMV, AVI, MOV, and MPEG, for example) Literally hundreds of standards are used to represent information that a user sees in an application Probably one of the best examples of applications with a very clear presentation layer function is a web browser, since it has many special marking codes, called tags, which define how data should be represented to the user The presentation layer can also provide encryption to secure data from the application layer; however, this is not common with today s methods of security, since this type of encryption is performed in software and requires a lot of CPU cycles to perform
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The presentation layer determines how data is transmitted and represented to the user Examples of
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presentation layer protocols and standards include ASCII, BMP, GIF, JPEG, WAV, AVI, and MPEG
Layer 5:The Session Layer
The fifth layer of the OSI Reference Model is the session layer The session layer is responsible for initiating the setup and teardown of connections To perform these functions, the session layer must determine whether data stays local to a computer or must be obtained or sent to a remote networking component In the latter case, the session layer initiates the connection The session layer is also responsible for differentiating among multiple network connections, ensuring that data is sent across the correct connection as well as taking data from a connection and forwarding it to the correct local application The actual mechanics of this process, however, are
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