[&] Which of the following events would prevent a router from creating a PIM-Register message?
- No knowledge of the PIM-RP
- PIM Sparse-Dense-Mode configured on all interfaces
- No route to the PIM-RP
- Receipt of only one multicast data packet from the multicast Source

[&] Upon receiving a PIM-Register packet, what two things would one expect the PIM RP to immediately do next?
- Forward the embedded multicast packet down the SPT
- Forward the embedded multicast packet down the Shared Tree
- Generate a PIM (S,G) Join
- Generate a Register-Stop message
- Generate a PIM (*,G) Join

[&] After multicast traffic is flowing down the SPT from Source-to-Receiver, and if the RP is not in the path of that SPT, how is the RP informed that the multicast stream is still in progress should another Receiver request it?
- It is not.  The RP would have no way of knowing.
- The RP periodically transmits PIM Null-Register messages
- The RP periodically receives PIM Null-Register messages
- The RP periodically transmits PIM (S,G) Joins up its own SPT for previously known GDAs