Regarding task 6.1 I do not really understand why we are adding the static mroute that validates the R3 loopback address 184.108.40.206 against s2/0.12 ??
and i need the same explanation for task 6.2 thanks a lot guys for the help
We don't have PIM running on the link between R2-R3 and R3 is RP and to avoid RPF issue we need to change Mcast path.
The same reason is in 6.2, by default (based on IGP routing information) Mcast traffic would use R2-R3 link, so we need to force it to use longer path through R1.