hardMultiple Choice
CCNP Practice Question: Runs the following command on Router R4: R4# show…
A network engineer runs the following command on Router R4:
R4# show ip pim rp mapping
PIM Group-to-RP Mappings This system is an RP (Auto-RP) This system is an RP (BSR) Group(s) 224.0.0.0/4 RP 10.0.0.2 (?), v2v1 Info source: 10.0.0.2 (?), elected via Auto-RP, expires in 00:01:30 RP 10.0.0.3 (?), v2v1 Info source: 10.0.0.3 (?), elected via BSR, expires in 00:02:00
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the misconception that a router cannot be an RP for both Auto-RP and BSR simultaneously, but the output confirms it can, and the trap is that candidates assume only one protocol is active when both are clearly listed.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Both Auto-RP and BSR are configured, causing multiple RP mappings.
The output shows two separate RP mappings for the same group range 224.0.0.0/4: one from Auto-RP (RP 10.0.0.2) and one from BSR (RP 10.0.0.3). The router also explicitly states 'This system is an RP (Auto-RP)' and 'This system is an RP (BSR)', confirming that both protocols are actively configured and providing RP information, leading to multiple RP mappings.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Only Auto-RP is being used for RP mapping.
Why it's wrong here
The output contains a line labeled 'elected via BSR', which directly proves that BSR (Bootstrap Router) is also participating in RP discovery. Therefore, saying only Auto-RP is being used is factually incorrect. Both mechanisms are active, and each has generated its own RP mapping for the same multicast group range.
- ✗
Only BSR is being used for RP mapping.
Why it's wrong here
Similarly, the line 'elected via Auto-RP' demonstrates that Auto-RP is still in operation alongside BSR. The router is receiving RP advertisements from both the Auto-RP mapping agent and the BSR-elected RP. Thus, BSR is not the only RP-mapping protocol in use.
- ✓
Both Auto-RP and BSR are configured, causing multiple RP mappings.
Why this is correct
The output shows two distinct RP addresses for the same group range, one elected via Auto-RP and one elected via BSR. This occurs when both Auto-RP and BSR are configured, and the router accepts RP information from both protocols. The result is multiple RP mappings for the same multicast group, which can cause inconsistent RPF behavior and forwarding loops if the RPs differ.
- ✗
The router is not an RP.
Why it's wrong here
The output explicitly contains 'This system is an RP' for both the Auto-RP and BSR entries, confirming that the router is acting as an RP for the multicast group. Therefore, the claim that the router is not an RP is contradicted by the very output being examined. Being an RP means the router has been configured or elected to serve as the rendezvous point for that group range.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 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 350-401 exam.