Quick Answer
The answer is Anycast-RP, the recommended multicast RP model for large-scale networks because it provides both redundancy and load sharing by allowing multiple Rendezvous Points to share a single IP address. This design enables sources and receivers to register with the closest RP, optimizing path selection, while MSDP or PIM synchronizes multicast state between RPs to ensure seamless failover and traffic distribution. On the Cisco SPCOR 350-501 exam, this concept tests your understanding of scalable multicast architectures, often appearing in questions that contrast Anycast-RP with static or Auto-RP models; a common trap is confusing Anycast-RP with simple RP redundancy that lacks load sharing. Remember the key differentiator: Anycast-RP uses the same IP on multiple routers, so think “same address, many routers” for instant recall.
This 350-501 practice question tests your understanding of services. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which multicast RP model is recommended for large-scale networks to provide redundancy and load sharing?
Auto-RP
Why wrong: Incorrect. Auto-RP uses a multicast address and may have scalability issues.
BSR
Why wrong: Incorrect. BSR uses a bootstrap router and can be complex to manage in large networks.
Anycast-RP
Correct. Anycast-RP uses the same IP address for multiple RPs, enabling load sharing and redundancy.
Static RP
Why wrong: Incorrect. Static RP provides no automatic failover or load sharing.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Anycast-RP
Anycast-RP is recommended for large-scale networks because it allows multiple RPs to share the same IP address, providing redundancy and load sharing without requiring dynamic RP discovery protocols. This model uses MSDP (Multicast Source Discovery Protocol) or PIM (Protocol Independent Multicast) to synchronize multicast state between RPs, ensuring that sources and receivers can register with the nearest RP for optimal path selection.
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.
Auto-RP
Why it's wrong here
Incorrect. Auto-RP uses a multicast address and may have scalability issues.
BSR
Why it's wrong here
Incorrect. BSR uses a bootstrap router and can be complex to manage in large networks.
Anycast-RP
Why this is correct
Correct. Anycast-RP uses the same IP address for multiple RPs, enabling load sharing and redundancy.
Related concept
Read the scenario before looking for a memorised answer.
Static RP
Why it's wrong here
Incorrect. Static RP provides no automatic failover or load sharing.
Common exam traps
Cisco often tests the misconception that BSR or Auto-RP provide load sharing, but the trap here is that only Anycast-RP explicitly supports both redundancy and load sharing by allowing multiple RPs to actively serve different groups or sources simultaneously.
Detailed technical explanation
Anycast-RP leverages the same IP address on multiple RPs, typically using a loopback interface with a /32 mask, and relies on MSDP (RFC 3618) to exchange active source information between RPs. In a real-world scenario, if one RP fails, PIM registers are automatically redirected to the next nearest RP via unicast routing, ensuring seamless failover. A subtle behavior is that MSDP peering must be configured between all RPs in the anycast group, and the RPs must be in the same PIM domain or use inter-domain MSDP for proper state synchronization.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Services — This question tests Services — Read the scenario before looking for a memorised answer..
The correct answer is: Anycast-RP — Anycast-RP is recommended for large-scale networks because it allows multiple RPs to share the same IP address, providing redundancy and load sharing without requiring dynamic RP discovery protocols. This model uses MSDP (Multicast Source Discovery Protocol) or PIM (Protocol Independent Multicast) to synchronize multicast state between RPs, ensuring that sources and receivers can register with the nearest RP for optimal path selection.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.
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