The answer is that PIM sparse mode requires a Rendezvous Point (RP) to facilitate group membership, while PIM dense mode uses a flood-and-prune approach. This distinction is correct because PIM-DM assumes every router wants to receive multicast traffic and floods it everywhere, then prunes branches where no receivers exist, whereas PIM-SM operates on a pull model where routers must explicitly join a group by sending join messages toward the RP. On the Cisco SPCOR / CCNP Service Provider Core 350-501 exam, this concept tests your understanding of multicast forwarding mechanisms and is often presented as a comparison question with two correct statements. A common trap is confusing the RP with the designated router or assuming dense mode uses explicit joins; remember that dense mode pushes traffic first and asks questions later, while sparse mode waits for an invitation. A helpful memory tip is "Dense floods and prunes; Sparse joins and tunes."
350-501 Networking Practice Question
This 350-501 practice question tests your understanding of networking. 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 TWO statements correctly describe differences between PIM dense mode and PIM sparse mode? (Choose two.)
PIM-DM assumes all downstream routers want to receive multicast traffic, so it initially floods traffic.
Why this is correct
Dense mode floods to all interfaces and then prunes where not wanted.
Related concept
Read the scenario before looking for a memorised answer.
✓
PIM-SM requires a Rendezvous Point (RP) to facilitate group membership.
Why this is correct
RP is a key component in sparse mode.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Identify which 350-501 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Networking — This question tests Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: PIM-DM assumes all downstream routers want to receive multicast traffic, so it initially floods traffic. — PIM-DM floods everywhere and prunes; PIM-SM uses RPs and explicit join. Dense mode uses flood-and-prune; sparse mode uses pull model.
What should I do if I get this 350-501 question wrong?
Identify which 350-501 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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