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Posted by Gabriele Beltrame on July 1, 2007, 5:49 am
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> Hi all-I was on an exam site called http://www.ciscolabrat.co.uk/
> One of the questions has two answers-but which one is correct?
>
> In a multi access Ethernet network where does a router send an LSU
> when it detects a directly connected network has failed?
>
> 1-out all interfaces to all neighbors
>
> 2-To all congfigged neighbors within the AS
>
> 3-To all configged neighbors within theOSPF area
>
> 4 -to the DR
>
> my first attempt I put 3-which was marked incorrect-I then tried again
> with 4(which is the answer it gave me) then it said the answer was 3.
> Tried looking all over for a correct answer-all help greatfully
> appreciated.
>
Hi,
If there is a DR ( default for an Ethernet domain ) the LSUs are sent to the
DR (and BDR) by multicasting using address 224.0.0.6 instead of the "usual"
224.0.0.5. The DR, in turn, sends the LSU to the other routers in the same
ethernet domain.
Regards,
Gabriele
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