Networking Solutions Chapter 2 – The OSI Model

The Layered Approach Similar to a company like ◦ Advantages ◦Divides the network into ◦Multiple vendors can ◦Encourages ◦Prevents changes in one layer

The OSI Model 7 Application 6 Presentation 5 Session 4 Transport 3 Network 2 Data link 1 Physical

Application Layer Where the user Apps like IE interact with Note on page

Presentation Layer Presents data to the Application Layer and is responsible for and occur at this layer

Session Layer Responsible for Coordination is established in

Transport Layer Segments and (connection-oriented) or (connectionless) SYN / ACK Flow

Network Layer Addressing of Track Determines Packets sent are either

Data Link Layer Provides Routers don’t care Switches care about Two sublayers:

Physical Layer Sends is defined at this layer

Other “stuff” to know Router points on page X on pages 49 / 50 Encapsulation on page 51