Seven+Layers

__ 1 - Physical - Governs the layout of cables and devices such as repeaters and hubs.
 * __The Seven Layers of the Open Systems Interconnection Reference Model (OSI) Model

2 - Data Link - 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 layer 2 devices.

3 - Network - Handles routing of data across network segments.

4 - Transport - Provides for reliable delivery of packets.

5 - Session - Establishes sessions between network applications.

6 - Presentation - Converts data so that systems that use different data formats can change exchange information.

7 - Application - Allows applications to request network services.**