An animal control HQ must choose how multi-site county routers learn which router is the RP for camera groups. Which comparison correctly describes static RP, Auto-RP, and BSR?
Select an answer to reveal the explanation.
Short Explanation
Static RP is like writing the meeting room on a whiteboard—everyone must see the same note. Auto-RP and BSR are the building PA system that announces “RP for these groups is over here.” Pick static for small, tightly controlled fabrics; pick dynamic mapping when many routers must stay in sync without constant touch.
Full Explanation
Animal-control HQ routers must learn which device is the RP for camera groups. Static RP is operationally simple and deterministic but requires identical manual configuration (often with group ACLs) on every PIM router. Auto-RP (Cisco) and BSR (standards-based) dynamically advertise RP-to-group mappings so the fabric converges without constant per-box edits. That comparison is the correct conceptual framing for choosing an RP discovery method in a multi-site county design.
Claiming Auto-RP and BSR both require MSDP, or that static RP cannot be used with PIM-SM, mixes mechanisms. MSDP is commonly paired with anycast RP for SA sharing; it is not a prerequisite for Auto-RP or BSR, and static RP is a classic PIM-SM option.
Saying BSR works only inside a single VLAN, or that Auto-RP replaces PIM entirely on WAN edges, is false by concept. Both distribute RP mappings across a PIM domain; neither replaces PIM-SM forwarding.
Asserting that static RP advertises on 224.0.1.39 while BSR is limited to IPv6 MLD reverses and confuses protocols. 224.0.1.39/40 are Auto-RP related; BSR uses its own bootstrap mechanism and is not an MLD-only IPv6 feature.
Exam caveat: dynamic RP methods still need filtering against rogue announcers; “dynamic” does not mean “unauthenticated trust everything.”
Operational check: pick one method for the county camera ranges, verify consistent RP mapping on border routers (show ip pim rp mapping), and lab a candidate-RP failure to confirm discovery behavior. Record the chosen method and group ACLs in the civic multicast design package.