Cisco
352-001 · Question #653
352-001 Question #653: Real Exam Question with Answer & Explanation
The correct answer is C: Enable the IGMP querier feature on LAN switch A. Without a multicast router acting as an IGMP querier, enabling the querier on a switch and adding a static MAC entry for the multicast server restores proper Layer 2 multicast forwarding.
Question
Refer to the exhibit. Which two features can be used to make multicast work in this situation? (Choose two.)
Options
- ADisable IGMP snooping on both switches
- BDisable the IGMP query election process
- CEnable the IGMP querier feature on LAN switch A
- DConfigure a static MAC entry for the multicast server
- EDisable PIM snooping on both switches
Explanation
Without a multicast router acting as an IGMP querier, enabling the querier on a switch and adding a static MAC entry for the multicast server restores proper Layer 2 multicast forwarding.
Common mistakes.
- A. Disabling IGMP snooping resolves the flooding problem by flooding multicast to all ports, but this wastes bandwidth and is not a targeted or best-practice solution for a missing querier.
- B. Disabling the IGMP query election process does not solve the underlying problem - it still leaves no querier present, so group membership cannot be maintained by IGMP snooping.
- E. Disabling PIM snooping is unrelated to the Layer 2 IGMP querier absence issue and would not affect IGMP-based group membership tracking on the switches.
Concept tested. IGMP querier and static MAC for Layer 2 multicast forwarding
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