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OCR: Figure 5 - OSI Functional Layers 1.cvcf 7 -- Application Layer Provides services from all layers to a user Level 6 -- Presentation Layer Provides data transformation/compression services Requests a session from the Session Layer Level 5 -- Session Layer F.stablish and Terminate Connections Synchronize dialogues and Session recovery Provides nornal and expedited data exchange Level 4 -- Transport Layer Packctizes Session Layer messages Optimizes routing path End-w-end flow control, error detection & recovery Multiplexes single communication channel Level 3 -- Network Layer Establishes, maintains, and terminates connections Provides cost information to Transport Layer Determines nelwork routing and/or switching May provide sequencing of data Level 2 .. Data Link Layer Provides one or more data link connections Provides error-free cata delivery May provide flow control, sequencing Provides network id on multipoint connections Level 1 -- Physical Layer Provides transmission of raw bit sueams Provides activation, operation, and deactivation of physical connections