[&] A PIM Shared Tree exists composed of R1 (connected to the Multicast Source), R2, R3 (the PIM RP), R4 and R5 (connected to the Multicast Receiver). When the first multicast data packet starts to flow down this tree, which of these routers is allowed to initiate PIM Joins onto the Shortest Path Tree (SPT)?
- R4
- R2
- R3
- All of these routers may send a Join up their SPT
- None of these routers may send a Join up their SPT
- R5

[&] What is the name of the packet used in an attempt to get packets flowing from the Source down the SPT to the Receiver?
- PIM (S,G) Join
- PIM (*,G) Join
- PIM Include
- IGMP Membership Report
- PIM Register

[&] What does the command, "ip pim spt-threshold" allow you to do?
- Prevent a router from ever switching over to the SPT.
- Define a time (in seconds) after which a router may initiate a switchover to the SPT.
- Allow you to select the quantity of multicast data packets that must first be received before a router is allowed to switchover to the PIM SPT.
- Force a router to switchover to the PIM SPT upon receipt of just one multicast data packet

[&] What flag would one expect to see in your PIM (S,G) entry to indicate that your router has attempted to join the SPT, but multicast traffic has not yet been received on this tree?
- T-Flag
- A-Flag
- P-Flag
- J-Flag