It says:
Configure R5, R6 and R7 ethernet interfaces to support both PIM sparse and 
Dense mode streams.
Configure the link between R7 and R8 as well as R8 Ethernet to support PIPM 
Sparse-Dense.

R6 fa0/0
pim sparse-dense
R7 fa0/0 
pim sparse
R7 s0/0/0
pim sparse

R8 s0/0/0
ip pim sparse dense

So the first requirement it doesn't satisfy because both interfaces on R7 (R5 
is correct as well as R6) are set to sparse. The second requirement also is not 
satisfied because of R7 s0/0/0 being set to sparse. R8 ethernet is not set at 
all in the config example. I just wonder if it's intentionally set like that so 
R8 can't reach R5 (RP), and R7 can because R8 sets R7 statically as it's RP 
(override).

That would match with the example output, where R8 has no announced RP but does 
have a static RP.
But i don't see why setting an interface to sparse-dense mixed with sparse 
should prevent any multicast flowing?

 
On Jul 21, 2011, at 5:21 PM, Marko Milivojevic wrote:

> Without looking at the task, doesn't the WB explicitly ask for that in the 
> task?
> 
> --
> Marko Milivojevic - CCIE #18427
> Senior Technical Instructor - IPexpert
> 
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> 
> On Thu, Jul 21, 2011 at 02:33, Alef <[email protected]> wrote:
>> On all devices sparse-dense mode is configured, and on the link between R7 
>> and R8 sparse mode is configured, whereas on R8 again sparse-dense mode is 
>> configured. Does that have something to do with R8 needing to switch to 
>> sparse-dense to find the RP ?
>> 
>> Alef
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