To answer your question, my question to you John, would be this:
What is the purpose of the default Ethernet frame type on a Cisco router?
You've posed an excellent question - one that I mulled over for quite some
time until I answered the question I've asked you to solve... Understanding
why things work the way they do is the best way to understand and
troubleshoot networks.
-- Leigh Anne
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
John Neiberger
Sent: February 5, 2001 8:38 AM
To: [EMAIL PROTECTED]
Subject: Another 802.3 and Ethernet Question
While studying for CIT, I noticed something that had never occurred to me
before. The default ethernet frame type on a Cisco router is Ethernet_II,
but the only physical interface specified by Ethernet version 2 is 50-ohm
coax, IIRC, similar to 10base5 On 10baseT or 100baseTX interfaces, which
are on every router I've ever worked with, why is the default frame type not
IEEE 802.3?
Ethernet_II only has a type field, while IEEE 802.3 frames include 802.2
information. What sorts of functionality would be available through the use
of that frame type that are not available with Ethernet_II?
In IP-only environments, would there be a good reason to change to a
different frame type, or would we only benefit from a different frame type
in a non-IP environment or mixed environment?
Thanks,
John
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