Designing Cisco Network Service Architectures (ARCH, legacy) — Question 35

Multicast has been enabled and configured in the Enterprise, and PIM Sparse-mode has been enabled on all VLANs. What feature is required to stop multicast traffic from being broadcasted on the access layer switches?

Answer options

• A. Multicast boundary filter
• B. PIM dense-mode
• C. IGMP snooping
• D. Dynamic ARP inspection

Correct answer: C

Explanation

The correct answer is C, IGMP snooping, which allows switches to listen to IGMP messages and manage multicast group memberships, preventing unnecessary multicast traffic from flooding the access layer. Option A, multicast boundary filter, is not typically used for this purpose; B, PIM dense-mode, is not relevant as it is an alternative PIM mode; and D, Dynamic ARP inspection, pertains to ARP traffic, not multicast management.