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
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