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II Open Systems Interconnect
The OSI model determines which
parts do what in a LAN, and how they interconnect
to accomplish the mission of network communications. This
model is designed in layers. Beginning at the bottom layer, it includes
hardware, software, topologies, and other control functions:
Figure 24: OSI Model, showing flow of information from sending PC (left) to receiving PC (right)
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The OSI model is
a 7-layer model, which loosely details how things work. Each
layer builds on the previous one, adding
functionality to the capabilities included in the lower layers.
Understanding of the OSI model is required for successful NETWORK+
test. Certification.
We shall cover each layer one by
one, from lowest to highest.
 OSI = Success
The NETWORK+ test uses the OSI 7-layer model, not the older DOD (Department of Defense) model for TCP/IP when looking at the details of TCP/IP. Understanding of the OSI model, particularly where components function in the model, is an important part of the NETWORK+ theory portion of the test.
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