Anatomy of a Frame
The Network Access layer software accepts a datagram from the Internet layer and converts that data to a form that is consistent with the specifications of the physical network (see Figure 3.2). Because many forms of physical networks exist, there are many formats for data at the Network Access layer, and it would not be easy or useful to describe all these formats in detail.
Figure 3.2. The Network Access layer formats data for the physical network.
As an example of what happens to the data at the Network Access layer, consider the case of ethernet, the most common of the LAN architectures. When the ethernet software receives ...
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