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Ethernet/Token ring logical topologys

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  • 24-03-2007 2:39pm
    #1
    junii
    Closed Accounts Posts: 600 ✭✭✭


    Im going over some CCNA stuff here.

    Im a little confused as to the difference between a bus and ring topology.
    Physically, its easy to see the difference as there are two cables coming out of each machine on the physical ring whereas on the bus theres just one drop cable connected to the machine.

    Logically though....Is there any difference? It says here in my book Ethernet is physical star/logical bus and Token ring is physical star/logical ring.


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    #2
    Cake Fiend
    Registered Users Posts: 5,335 ✭✭✭Cake Fiend


    In a logical bus, all hosts share the same connection (bus). With older networks, it was like a phone party line - anyone could speak at any time, and everyone could hear (as long as only one host was 'speaking' at a time - this problem has pretty much been obsolesced by switches).

    In a logical ring, a host will only be connected to two other hosts (one on either side) and must communicate to all other hosts through these two peers (maybe modern ring switches have sorted this out though).


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    #3
    junii
    Closed Accounts Posts: 600 ✭✭✭junii


    Thanks for the reply.

    Do you think that maybe nowadays with switches, ethernet networks are logical stars rather than bus'?

    I was also thinking about ring switches today.
    You would imagine that they could make a token ring switch that would act like a normal ethernet switch for normal packets and also be able to send the token around in a ring. The token could have a special flag recognizible to the switch and forward it on to the next correct port.

    As you said though, maybe they have sorted it out.


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