Networking Solutions Chapter 2 – The OSI Model Similar to a company like ◦ ◦ ◦ Advantages ◦ Divides the network into ◦ Multiple vendors can ◦ Encourages ◦ Prevents changes in one layer The Layered Approach 7 6 5 4 3 2 1 Application Presentation Session Transport Network Data link Physical The OSI Model Where the user Apps like IE interact with Note on page Application Layer Presents data to the Application Layer and is responsible for layer and Presentation Layer occur at this Responsible for Coordination is established in Session Layer Segments and (connection-oriented) or (connectionless) SYN / ACK Flow Transport Layer Addressing of Track Determines Packets sent are either Network Layer Provides Routers don’t care Switches care about Two sublayers: Data Link Layer Sends is defined at this layer Physical Layer Router points on page 47 802.X on pages 49 / 50 Encapsulation on page 51 Other “stuff” to know