One DR per multiacess subnet, and an optional BDR. Definitely not
one per area.
I was a reviewer of the first edition, but not the second. This
question has no ideal answer, because "ethernet segment" isn't as
precise as I'd like. Do bridged segments count (remember OSPF
multicasts, not broadcasts)? How about multiple VLANs on the same
physical segment (each will need a DR)? What if there are secondary
subnets on the physical segment (results can be flaky. Avoid.)?
>Hi,
>
>Isn't the Designated Router the one on a broadcast type domain that
>all the routers decide should control the OSPF conversations to
>avoid everybody doing it thus reducing traffic. If so then 'C'
>would to me seem correct. As I understood it on a point to point
>connection (which there may be many in an area or AS) you do not
>elect a designated router.
>
>Teunis,
>Hobart, Tasmania
>Australia
>
>
>On Friday, November 17, 2000 at 08:59:36 PM, ajwhitaker wrote:
>
>> On page 553 of all-in-one ccie study guide, second edition, question 25
>> states:
>> There is one designated router per:
>> a) workgroup
>> b) area
>> c) ethernet segment
>> d) autonomous system
>>
>> The author lists the answer as (c) ethernet segment. I'm a little confused,
>> because I always thought that you need one OSPF designated router per area,
>> and ospf could care less what segment you are on. Can someone confirm this
> > for me?
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