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7 Cards in this Set
- Front
- Back
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(7) APPLICATION |
Provides an interface between the communications software and any applications that need to communicate outside the computer on which the application resides. It also defines processes for user authentication |
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(6) PRESENTATION |
Main purposes are to define and negotiate data formats , such as ASCII text , EBCDIC text , binary, BCD, and JPEG, Encryption is also defined by OSI as a presentation layer service. |
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(5) SESSION |
Defines how to start , control and end conversations . This includes the control and management of multiple bi-directional messages so that the application can be notified if only some of a series of messages are completed. This allows the presentation layer to have a seamless view of an incoming stream of data |
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(4) TRANSPORT |
Protocols provide a large number of services including data deliver to another computer (for instance error recovery and flow control ) |
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(3) NETWORK |
This layer defines three main features : logical addressing , routing (forwarding) and path determination Routing defines how devices (typically routers) forward packets to their final destination. Logical addressing defines how each device can have a and address that can be used by the routing process. Path determination refers to the work done by routing protocols to learn all possible routes , and choose the best route. |
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(2) DATA LINK |
The data link layer defines the rules that determine when a device can send data over a particular medium. Data link protocols also define the format of a header and trailer that allows devices attached to the medium to successfully send and receive data. |
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(1) PHYSICAL |
This layer typically refers to standards from other organizations . These standards deal with the physical characteristics of the transmission medium , including connectors , pins , use of pins , electrical currents , encoding , light modulation , and the rules for how to activate and deactivate the use of the physical medium |
