What a funny idea. Here we go:

This allows the data portion of the frame to be mapped to a hardware page, saving a memory-to-memory copy when the data is copied in the kernel.

There were only five sentences, counting the section heading, on that page, and the fifth actually wrapped to the next page. Most of page 23 is an illustration of IEEE 802.2/802.3 Encapsulation (RFC 1042). Guess the book.
No, there's no reward, unless you count the fame gained from being mentioned here, at least if you mail me a correct answer.