Thanks.
I mean, during encapsulation how IEEE 802.3 or Ethernet will be selected ?
"Who" decides that ?
"Curtis Call" <[EMAIL PROTECTED]> wrote in message
4.3.2.7.0.20010204110556.00ab6100@mail">news:4.3.2.7.0.20010204110556.00ab6100@mail...
> They are different standards for ethernet. They both use CSMA/CD. 802.3
> was defined by the IEEE and Ethernet was defined by Xerox I believe.
>
> The difference is in the packet format:
>
> Ethernet:
> Destination Address (6 octets) - Source Address (6) - Protocol (2) - Data
> (Variable) - FCS (4)
>
> 802.3
> Destination Address (6 octets) - Source Address (6) - Length (2) - Data
> (Variable) - FCS (4)
>
> A node can tell the difference between the two protocols because the
Length
> of a packet can never be more than 1518 bytes so if that value is more
than
> 1518 the node can tell that it is an Ethernet packet and that that
> particular spot is the protocol type field not the length.
>
> Given that 802.3 packets don't contain the protocol type field they cannot
> transport different network layer protocols without using additional
> information which is why 802.2 and SNAP was defined. The 802.2 or SNAP
> fields occur at the beginning of the Data portion of the packet and are
> used to specify which protocol is sending the packet.
>
> Did that answer your question?
>
> At 09:43 AM 2/4/01 -0800, you wrote:
> >I see a description of the differences between them but I can't really
> >understand that in practical terms.
> >Is the IEEE 802.3 the CSMA/CD ?
> >
> >
> >
> >
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