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Application Layer
The OSI model defines the application layer as being the user interface. The OSI application layer is responsible
for displaying data and images to the user in a human-recognizable format and to interface with the presentation
layer below it.
Examples of applications that utilize the network are:
- Telnet
- FTP
- Instant Message software (AIM, MSN, ICQ, Yahoo)
- Microsoft Windows File Shares
- Microsoft Internet Explorer (a web browser)
- Network games like Doom 2, Call of Duty, UT 2004 (first-person 3D shooter video games)
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Home
Application
Presentation
Session
Transport
Network
Data Link
Physical
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Function of Layer
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Protocols
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Network Components
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- used for applications specifically written to run over the network
- allows access to network services that support applications;
- directly represents the services that directly support user applications
- handles network access, flow control and error recovery
- Example apps are file transfer,e-mail, NetBIOS-based applications
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DNS; FTP; TFTP; BOOTP; SNMP;RLOGIN; SMTP; MIME; NFS; FINGER; TELNET; NCP; APPC; AFP; SMB
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Gateway
Proxy Server
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Created by Uluse©
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