Im finding the wording of this solution quite difficult to understand.
"Configure the RPs so that only sources connected to R3 and R4 are
allowed to send multicast traffic streams"
From this I got "all connected interfaces on R3 and R4" so on R3
187.1.3.0, 187.1.38.0, 187.1.235.0, 187.1.134.0.
What exactly do they mean by source? since there are no explicitly configured sources on R3 or R4 which could mean a source could be on any connected interface of R3 or R4?
How does "ip pim register-source loop0" fit into this?
And for "All multicast-enabled routers should permit building of multicast shared trees towards the two configured RPs only", why have they used the physical ip addresses of 187.1.134.4, 187.1.235.5 as the rp addresses on the "ip pim accept-rp" command?
surely it should be the rp announced addresses of 150.1.4.4 and 150.1.5.5?
