300-420 · Question #130
300-420 Question #130: Real Exam Question with Answer & Explanation
The correct answer is A: bidirectional. {"question_number": 5, "question": "Which PIM mode uses a shared tree only?", "correct_answer": "A", "explanation": "Bidirectional PIM (BIDIR-PIM) exclusively uses a shared tree rooted at the Rendezvous Point (RP) for all multicast traffic - both source-to-RP and RP-to-receiver t
Question
Which PIM mode uses a shared tree only?
Options
- Abidirectional
- Bsparse
- Cdense
- Dsource-specific
Explanation
{"question_number": 5, "question": "Which PIM mode uses a shared tree only?", "correct_answer": "A", "explanation": "Bidirectional PIM (BIDIR-PIM) exclusively uses a shared tree rooted at the Rendezvous Point (RP) for all multicast traffic - both source-to-RP and RP-to-receiver traffic flows along this shared tree. It never builds source-specific shortest-path trees (SPTs), which makes it highly scalable for many-to-many multicast applications. PIM Sparse Mode (B) uses a shared tree initially but performs an SPT switchover to a source tree once a receiver's DR reaches a threshold. PIM Dense Mode (C) uses source trees built via flood-and-prune. PIM SSM (Source-Specific Multicast, D) uses only source trees - receivers specify the exact source they want, bypassing any shared tree entirely.", "generated_by": "claude-sonnet", "llm_judge_score": 4}
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