Upon further review, I agree with Michael and Peter -- answer C is correct.
The text I originally quoted (p 193 ACRC) so states.
Steve
""Peter Abraham"" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Doug,
>
> I believe the answer is C. The order of promotion is always from BDR to DR
> when the DR fails. If router B fails then router C will be the DR, and
> router A which has just come up on the network then becomes the BDR.
>
> Peter.
>
>
> >From: "Stephen Alston" <[EMAIL PROTECTED]>
> >Reply-To: "Stephen Alston" <[EMAIL PROTECTED]>
> >To: [EMAIL PROTECTED]
> >Subject: Re: Question for DR/BDR in OSPF
> >Date: Tue, 12 Sep 2000 16:52:50 -0400
> >
> >Doug,
> > I see you're using one of your "lifelines"
> > I'd go with answer B & make it your final answer.
> >
> > Reason as stated in the ACRC book is "The only time a DR or BDR will
> >change is if one of them goes down. If the DR goes down, the BDR takes
> >over
> >as the DR and a new BDR is elected. If the BDR goes down, a new BDR is
> >elected."
> >
> >HTH,
> >Steve
> >
> >
> >"Doug Laing" <[EMAIL PROTECTED]> wrote in message
> >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > This is a question for study purposes. I want to verify what I think
> > > the answer is:
> > >
> > > Let's say Router A is the Designated Router with priority of 100 and
> > > fails. Router B (Backup Designated Router) with priority of 90 becomes
> > > the DR and Router C with a priority of 80 becomes the BDR.
> > >
> > > If Router A comes back up on the network?
> > > A) An election held and Router A becomes the DR and Router B becomes
the
> > > BDR..
> > >
> > > B) No election is held until Router B goes down. Then Router A
becomes
> > > the DR and Router C remains the BDR.
> > >
> > > C) No election is held until Router B goes down. Then Router C
becomes
> > > the DR and Router A becomes the BDR.
> > >
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