>In OSPF, the DR is chosen by
>A. MAC
>B. Hello Protocol
>C. Priority
>D. IP
>
>I chose C but Boson says B. Obviously I have read a 1000 times that the DR
>is elected by highest priority, so is Boson wrong here or am I
>mis-interpreting the way the question is worded (typical Cisco)......
>
It's a poorly worded question, but I would have to say B.
If a router interface with priority >0 initializes and there is no
answer to its hellos, it becomes BDR, and, if there is still no
response, it promotes itself to DR.
If there is a DR and a second router interface with priority >0
initializes, the second router becomes BDR.
If there a third router inerface initializes, regardless of priority,
it will go into DR-OTHER.
If the DR fails, the BDR will promote itself and priority may enter
into the new BDR election.
If several router interfaces initialize simultaneously and there is
no DR or BDR, priority, and then router ID, will break the tie.
So yes, priority enters into the selection insofar as an interface
with priority = 0 cannot become BDR or DR, but the most common
selection factor is order of initialization, governed by the hello
protocol. Priority essentially is a subset of the hello protocol.
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=16912&t=16895
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