Ethernet Video Series


Episode 07, Segment 06 of 10

Ethernet Delivers the Internet (continued)

Ethernet frames follow a pattern thatís very similar to telegrams. Inside the Ethernet frame, after the destination address, and the source Ethernet address, is the main message field. And that main message field inside the Ethernet frame can further be broken down into various sub-fields according to well-developed traditions and standards in the Ethernet community.

In fact, so many different people representing different organizations have had opinions and views and arguments about how to use the Ethernet message field that influential committees have been formed to create standards. Among the most important of these little sub-fields is one that tries to communicate a general description of the type of message and length of message transported inside this Ethernet frame. The exact formatting of the bits inside that little field have been a subject of considerable development and conflicting (some would say "confusing") evolution.

But itís not necessary that we understand those details. What is important is that we realize and trust that influential committees have agreed on the format by which information can be exchanged from one party to another, and that ultimately, our networking equipment can figure it out.

Probably the single most important message type that can be carried inside an Ethernet frame is an Internet protocol packet. This is the way Ethernet delivers the Internet.

Episode 07, Segment 07 of 10