The topmost layer is where most real traffic data is generated. All user program traffic such as that from e-mail and web browser software is on this layer. This is the layer which is easily seen by every user.<ref name="docs.oracle.com">http://docs.oracle.com/cd/E19253-01/816-4554/ipov-7/index.html</ref><ref name="support.microsoft.com">https://support.microsoft.com/en-us/kb/103884</ref><ref name="academia.edu">http://www.academia.edu/9562787/Open_System_Interconnection_OSI_A_Seven_Layered_Model</ref>
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The topmost layer is where most real traffic data is generated. All user program traffic such as that from e-mail and web browser software is on this layer. This is the layer which is easily seen by every user.<ref name="docs.oracle.com">http://docs.oracle.com/cd/E19253-01/816-4554/ipov-7/index.html</ref><ref name="support.microsoft.com">https://support.microsoft.com/en-us/kb/103884</ref><ref name="academia.edu">https://www.academia.edu/9562787/Open_System_Interconnection_OSI_A_Seven_Layered_Model</ref>