300-420 Question #44: Real Exam Question with Answer & Explanation

Question

Which two statements describe source trees in a multicast environment? (Choose two.)

Options

• ASource trees guarantee the minimum amount of network latency for forwarding multicast traffic
• BSource trees create an optimal path between the source and the receivers
• CSource trees use a single common root placed at some chosen point in the network
• DSource trees can introduce latency in packet delivery
• ESource trees can create suboptimal paths between the source and the receivers

Explanation

{"question_number": 4, "question": "Which two statements describe source trees in a multicast environment?", "correct_answer": "A, B", "explanation": "In PIM multicast, a source tree (also called a Shortest Path Tree or SPT) is rooted at the multicast source itself, with branches extending to each receiver. Because it follows the shortest path from source to each receiver, it creates an optimal forwarding path (B is correct) and guarantees the minimum possible network latency for delivering multicast traffic (A is correct). Option C describes a shared tree (Rendezvous Point Tree / RPT), where a common RP root is chosen - not the source. Options D and E (latency and suboptimal paths) are characteristics of shared trees, not source trees, because shared trees route traffic through an RP that may not be on the optimal path.", "generated_by": "claude-sonnet", "llm_judge_score": 4}

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