Ethernet Video Series
Episode 08, Segment 05 of 05
The 7-Layer Vocabulary of Modern Internetworking
ISO / OSI Reference Model (continued)
Several of the networking movies published at AskMisterWizard.com have referred to the concept of encapsulation, and by now, viewers should be clear that one message can contain another message inside. This concept can be carried forward to several layers of messages within messages. And it is commonplace for the various layers of the ISO model to be represented as a package inside a package, or a message inside a message at successively larger sizes at the various layers as they encapsulate one another.
|To help you visualize this concept in the context of
the Internet and a local area network, we might go so far as to
illustrate several envelopes inside envelopes, inside one another with a
small envelope on the right inserted into successively larger envelopes
layer by layer, and finally into a very large envelope at the left. We
could label each of those envelopes with the layers associated with a
particular OSI level of intelligence, and also with the kind of
functionality performed by the Internet at that corresponding layer.
This allows us to map the real exercise of the Internet with the
vocabulary of the OSI in a way that we can visualize with our eyes to
make it memorable.
End of "Ethernet Series".
Continue with "Internet Series Part 1",