Multicast mode on a Cisco Wireless LAN Controller (WLC) impacts the network in the following ways:
Efficient Packet Delivery ✅
In multicast mode, the WLC sends only one copy of a multicast packet to a multicast group address.
The network infrastructure (switches and routers) then replicates and forwards the packets to APs that have subscribed to the multicast group.
Reduces Controller Load ✅
Unlike unicast mode, where the WLC sends a separate copy of a multicast packet to each AP, multicast mode shifts the replication process to the network, reducing the burden on the WLC.
Requires Multicast Routing Configuration ✅
The network must support PIM (Protocol Independent Multicast) and have IGMP snooping enabled for efficient delivery.
(B) Packet replication is performed on the controller. ❌
This describes unicast mode, where the WLC replicates the multicast packet and sends individual copies to each AP.
When multicast mode is configured on a Cisco Wireless LAN Controller (WLC), the following characteristic affects the wireless network:
Packet Replication is Performed on the Controller:
In multicast mode, the WLC receives a single multicast stream from the network and replicates it for each Access Point (AP) that has clients subscribed to the multicast group. This ensures that multicast traffic is efficiently delivered to all interested clients without flooding the entire network.
Why the Other Options Are Incorrect:
A. The controller sends multicast packets to a user group:
While the WLC does send multicast packets to clients, the key characteristic is that packet replication is performed on the controller, not just sending packets to a user group.
C. Packet replication is performed on the network:
Packet replication is not performed on the network; it is handled by the WLC to ensure efficient delivery to APs and clients.
D. The controller sends every multicast packet associated APS:
This is not accurate. The WLC only sends multicast packets to APs that have clients subscribed to the multicast group, and it handles packet replication internally.
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