Introduction to IEEE 802.11's MAC Sub-layer Frame Structure
Besides defining access control and resource sharing capabilities for multiple stations contending for a common LAN medium, one of the other key operations performed by the Data Link layer is known as “framing,” which is the process of encapsulating the higher-layer protocol packet (which may or may not be a Network layer protocol packet) in a set of Data Link layer headers, and appending a Data Link layer trailer, which is often simply an error-detecting sequence.
The Data Link layer header will include at least the following items:
MAC sub-layer Destination Address (i.e., MAC-DA)
MAC sub-layer Source Address (i.e., MAC-SA)
Another common Data Link layer header element is a “type” or ...
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