Quick Answer
The answer is PIM-SM with BSR, as it is the best protocol for building a shared distribution tree with a dynamically elected RP in a service provider IPTV multicast design. BSR automates RP election through a distributed process where candidate BSRs exchange bootstrap messages to elect a single Bootstrap Router, which then collects candidate-RP advertisements and distributes the RP-set to all PIM routers, eliminating the need for manual RP configuration. On the Cisco SPCOR 350-501 exam, this scenario tests your understanding of dynamic RP mechanisms versus static RP or Auto-RP, with a common trap being confusion over BSR’s use of a designated domain-wide flooding mechanism versus Auto-RP’s reliance on multicast groups. Remember the memory tip: BSR uses a “bootstrap” to kickstart the RP-set, while Auto-RP needs a separate mapping agent—think “BSR builds the bridge” for dynamic election.
This 350-501 practice question tests your understanding of architecture. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer needs to design a multicast solution for IPTV distribution across a service provider network. Which protocol is best suited for building a shared distribution tree where the RP is dynamically elected?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
PIM-DM
Why wrong: PIM-DM is dense mode, not shared tree and no RP.
PIM-SM with Auto-RP
Why wrong: Auto-RP is Cisco proprietary, not standard.
MSDP
Why wrong: MSDP is used to connect multiple PIM-SM domains.
PIM-SM with BSR
BSR provides dynamic RP election in a standards-based way.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
PIM-SM with BSR
PIM-SM with BSR (Bootstrap Router) is the correct choice because it provides a dynamic, automated mechanism for electing an RP (Rendezvous Point) within a PIM-SM domain. BSR uses a distributed election process where candidate BSRs exchange bootstrap messages to elect a single BSR, which then collects candidate-RP advertisements and distributes the RP-set to all routers, enabling shared distribution trees without manual RP configuration.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
PIM-DM
Why it's wrong here
PIM-DM is dense mode, not shared tree and no RP.
PIM-SM with Auto-RP
Why it's wrong here
Auto-RP is Cisco proprietary, not standard.
MSDP
Why it's wrong here
MSDP is used to connect multiple PIM-SM domains.
PIM-SM with BSR
Why this is correct
BSR provides dynamic RP election in a standards-based way.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Cisco often tests the distinction between Auto-RP and BSR, where candidates mistakenly think Auto-RP dynamically elects the RP, but Auto-RP only advertises RP information from a statically configured RP or mapping agent, whereas BSR provides true dynamic RP election through a distributed bootstrap process.
Detailed technical explanation
BSR operates by having candidate BSRs send bootstrap messages with a priority and IP address; the router with the highest priority (or highest IP as tiebreaker) is elected as the BSR. The elected BSR then collects candidate-RP advertisements (C-RP) via unicast and distributes the RP-set to all PIM routers in the domain using hop-by-hop flooding of BSR messages. In real-world IPTV deployments, BSR is preferred over Auto-RP because it avoids the need for a static mapping agent and provides faster convergence when RPs fail, as the BSR can dynamically promote a new RP from the candidate pool.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 350-501 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Architecture — This question tests Architecture — Read the scenario before looking for a memorised answer..
The correct answer is: PIM-SM with BSR — PIM-SM with BSR (Bootstrap Router) is the correct choice because it provides a dynamic, automated mechanism for electing an RP (Rendezvous Point) within a PIM-SM domain. BSR uses a distributed election process where candidate BSRs exchange bootstrap messages to elect a single BSR, which then collects candidate-RP advertisements and distributes the RP-set to all routers, enabling shared distribution trees without manual RP configuration.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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