1.3 Building Blocks of Digital Wireless
Wireless Networking Cont . . .
Layer 6 - Presentation: Provides high-level services such as encryption (for security) and compression (for transmission efficiency) to applications.
Layer 7 - Application: See the discussion for Open Data Network model.
Notice that layers 4-7 are different that layers 1 and 2 in that the upper layers are concerned with end-to-end transport, while the lower layers are concerned with individual links. Layer 3 provides the glue by finding a collection of links to make the end-to-end path.
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