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OSI layers

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Term
Definition
physical layer   Governs the layout of cables and devices such as repeaters and hubs  
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data link layer   Provides MAC addresses to uniquely identify network nodes and a means for data to be sent over the Physical layer in the form of packets. Bridges and switches are ...... devices.  
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network layer   Handles routing of data across network segments.  
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transport layer   Provides for reliable delivery of packets.  
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session layer   Establishes sessions between network applications.  
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presentation layer   Converts data so that systems that use different data formats can exchange information.  
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application layer   Allows applications to request network services.  
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