Howard Hudson - Week 3 - IEEE 802.3 Ethernet Frame Standard
Similar to the Ethernet cable, the Ethernet frame has
evolved thanks to a focused effort to develop the IEEE 802.3 standard. There
were four frame types created (five if you count Ethernet version 1).
The standards included Ethernet II (also known as Ethernet 2
and Ethernet DIX), IEEE 802.3, EEE 802.3 + IEEE 802.2 LLC, and IEEE 802 SNAP. However,
at the end of the day Ethernet II prevailed.
Unfortunately, there are a few points of confusion still
floating around the internet regarding the IEEE 802.3 standard because it is
not Ethernet per say...it is the IEEE standard. The first is the structure of the “preamble” and “start
of frame”. Second, whether “type”, “length”, or both are used. The third is the
use of the “Pad” field. Then again, the Ethernet frame and IEEE 802.3 frame are relatively interchangeable at this point (at the casual conversation level). The Frame table below is the result of weeding through numerous resources.
Frame
7 + 1
|
6
|
6
|
2
|
46-1500
|
4
|
||
Preamble
|
Start of Frame
|
Destination Address
|
Source Address
|
Length / Type
|
Data
|
Pad
(A Pad is added if data field less
than 46)
|
Frame Check Sequence
|
Ethernet frame and IEEE 802.3 frame
Resources
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