24-port NWay Ethernet Switch User’s Guide
Switch Management and Operating Concepts
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Figure 5-9. Class C Subnet Masks
Internet Protocols
This is a brief introduction to the suite of Internet Protocols
frequently referred to as TCP/IP. It is intended to give the
reader a reasonable understanding of the available facilities
and some familiarity with terminology. It is not intended to
be a complete description.
Protocol Layering
The Internet Protocol (IP) divides the tasks necessary to route
and forward packets across networks by using a layered
approach. Each layer has clearly defined tasks, protocol, and
interfaces for communicating with adjacent layers, but the exact
way these tasks are accomplished is left to individual software
designers. The Open Systems Interconnect (OSI) seven-layer
model has been adopted as the reference for the description of
modern networking, including the Internet.
A diagram of the OSI model is shown below (note that this is not
a complete listing of the protocols contained within each layer of
the model):
