To support efficient bandwidth utilization for broadcasting multicast packets to all WLANs on the AP, which two mechanisms can you configure on the Cisco WLCs? (Choose two.)
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A. B. C. D. E. F.DF.
To support efficient bandwidth utilization for broadcasting multicast packets to all WLANs on the AP, two mechanisms can be configured on the Cisco WLCs: VideoStream and RRC.
VideoStream is a technology that can be used to convert multicast transmissions to broadcast or unicast transmissions at the AP. This allows the AP to receive ACKs from clients and determine which frames need to be retransmitted, thus improving reliability and reducing packet loss.
Option A suggests using VideoStream to convert multicast transmissions to broadcast transmissions at the AP. This allows the AP to receive ACKs from the clients and determine which frames need to be retransmitted.
Option B suggests using VideoStream to convert multicast transmissions to unicast transmissions at the AP. The same data rate will be used, but the unicast stream allows the AP to receive ACKs from the clients and determine which frames need to be retransmitted. This option is more efficient than Option A because unicast transmissions only send packets to the intended recipient, whereas broadcast transmissions send packets to all recipients.
Option E also suggests using VideoStream to convert multicast transmissions to unicast transmissions at the AP. However, because of the unreliable nature of wireless media, no ACKs are expected from the clients. Unicast transmission will effectively reduce multicast packet loss rate (PLR) to between 0.1 and 0.5 percent, which is much lower than the typical multicast PLR of 5-10%.
RRC (Radio Resource Control) is a technology that can be used to manage radio resources on the AP. RRC uses channel utilization as a metric to determine capacity and perform admission control. It can deny requests that would cause oversubscription by sending SAP (Service Announcement Protocol) messages to clients on drop.
Option C suggests that RRC in a Cisco WLC will use channel utilization as a metric to determine capacity and perform admission control, but it does not deny requests that would cause oversubscription.
Option D suggests that RRC in a Cisco WLC will use channel utilization as a metric to determine capacity and perform admission control, and it denies requests that would cause oversubscription by sending SAP messages to clients on drop.
In summary, to efficiently utilize bandwidth for broadcasting multicast packets to all WLANs on the AP, VideoStream can be used to convert multicast transmissions to either broadcast or unicast transmissions. RRC can be used to manage radio resources on the AP, using channel utilization as a metric to determine capacity and perform admission control, and it can deny requests that would cause oversubscription by sending SAP messages to clients on drop.