network segmentation without using vlans

[James Knott]

Kristian Erik Hermansen wrote:
> On Feb 19, 2008 1:25 PM, James Knott <james.knott-bJEeYj9oJeDQT0dZR+AlfA at public.gmane.org> wrote:
>   
>> Given the hand shaking that goes on between the switch and a device
>> plugged into it, I doubt it as the device couldn't connect to the switch.
>>     
>
> http://en.wikipedia.org/wiki/Unidirectional_network
>   
And from that:

"However protocols normally used over network connections, such as 
TCP/IP <http://en.wikipedia.org/wiki/TCP/IP>, that require 
acknowledgments <http://en.wikipedia.org/wiki/Acknowledgments> to be 
sent back, cannot be used over a unidirectional network. This prevents a 
large number of programs from being able to function normally over such 
a network. Importantly the Unidirectional Network does not prevent 
viruses or other malicious programs from being transferred on to the 
high network and compromising the integrity and availability of the 
data. Furthermore since the low side cannot receive data from the high 
side, it can never reliably establish that data has been successfully 
transferred^[1] 
<http://en.wikipedia.org/wiki/Unidirectional_network#_note-Slay_1> ."


As I mentioned, there is hand shaking that goes on, when a device is 
plugged into a switch.  This is called the link integrity test.  Also, 
most equipment now performs auto-negotiation, to determine speed & 
duplex etc.  How will either of these work, if one device can't hear the 
other?
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