OSPF question

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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.


Re: OSPF question
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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



Re: OSPF question
On Sun, 1 Jul 2007 11:49:11 +0200

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By domain, do you mean the whole AS (all the areas) or the LAN  segments the DR
is directly connected to?



Re: OSPF question

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Hi,

I mean broadcast domain.

Regards,
Gabriele



Re: OSPF question
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So to clarify -the correct answer is 3)to all configged routers in the
OSPF area-not the AS?
ALso is 224.0.0.6 for all DR routers and 224.0.0.5 for all other
routers?


Re: OSPF question
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Hi,

Correct answer is 4) To the DR (and BDR)
Yes, 224.0.0.6 is for DR/BDR and 224.0.0.5 is for "the others".

Regards,
Gabriele



Re: OSPF question
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Many thanks


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