300-360 Question #74: Real Exam Question with Answer & Explanation

Question

Options

• Averify that the L3 interfaces are configured for pim sparse-dense-mode on the VLAN servicing the
• Bchange the wireless controller from Multicast-Unicast mode to Multicast-Multicast mode and
• Cverify that IGMP snooping is disabled on the wireless controller since the access points are
• Dverify that Global Multicast mode has been enabled
• Emake sure the highest mandatory rate is set to 54 Mbps so that the multicast traffic has sufficient
• Fverify Multicast Listener Discovery (MLD) v1 snooping has been enabled to keep track of and

Explanation

For multicast to work end-to-end on a Cisco wireless network, three key conditions must be met. First, verify that Global Multicast mode is enabled on the WLC (D) - without this, the controller will not process multicast traffic at all. Second, verify that PIM (Protocol Independent Multicast) sparse-dense-mode is configured on the L3 VLAN interfaces (A) - PIM is required for the wired network to route multicast traffic to the AP's VLAN. Third, change the controller from Multicast-Unicast mode to Multicast-Multicast mode (B) - Multicast-Unicast replicates multicast as unicast per client and can cause scalability issues; Multicast-Multicast mode uses a dedicated multicast group for AP-to-AP delivery and is the preferred method. Disabling IGMP snooping (C) is incorrect; IGMP snooping is needed to manage multicast group membership. Changing the mandatory rate to 54 Mbps (E) would shrink coverage and is unrelated to multicast delivery. MLD (F) is for IPv6 multicast, not IPv4.

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