Which protocol is used by multicast to prevent loops?（）

单项选择题WhichstatementdescribestheWLCv5.2deliveryofamulticastpacketfromawiredPCsourceon VLAN_XtoarespectivewirelessclientusingSSID_X,usingaWLANcontrollerenabledformulticast?（）

A.A packet is delivered to Cisco WLC and forwarded via multicast to all of its associated APs, and finally  to all wireless clients of that Cisco WLC, via wireless multicast.
B.A packet is delivered to Cisco WLC and forwarded via unicast to all of its associated APs, and finally to  all wireless clients of that Cisco WLC, via wireless unicast.
C.A packet is delivered to Cisco WLC and forwarded via multicast to all of its associated APs, discarded  at APs without SSID_X joined wireless clients, and forwarded at APs with SSID_X joinedwireless clients  via wireless multicast.
D.A packet is delivered to Cisco WLC and forwarded via unicast to all of its associated APs, discarded at  APs without SSID_X joined wireless clients, and forwarded at APs with SSID_X joined wireless clients  via wireless multicast.
E.A packet is delivered to Cisco WLC and forwarded via multicast to all of its associated APs, discarded  at APs without SSID_X joined wireless clients, and forwarded at APs with SSID_X joinedwireless clients  via wireless unicast.
F.A packet is delivered to Cisco WLC and forwarded via unicast to all of its associated APs, discarded at  APs without SSID_X joined wireless clients, and forwarded at APs with SSID_X joined wireless clients  via wireless unicast.

多项选择题WhichthreecallinformationitemsdoesAirMagnetVoFiAnalyzerprovide?（）

A.the codec used by the calling phone
B.approximate length of the call in minutes
C.MOS values throughout the duration of the call
D.802.11e access category overruns
E.co-channel interference percentage during the call

多项选择题WhichtwomulticastmodesarevalidoptionsforusewithEthernetbridgingonameshAP?（）

A.mesh bridge in
B.regular
C.bi-directional bridge
D.in
E.out

单项选择题WhatwillimprovethebatterylifeofaCiscoUnifiedWirelessIPPhone7921G?（）

A.configuring phone to auto select network
B.configuring beacon period to 80 ms
C.configuring DTIM period to 2
D.enabling RRM

多项选择题WhichtwostatementscorrectlydescribeaCiscoWLCconfigurationofWireless>QoS>Profiles>Wired_QoS_ProfilesforanimplementationofDSCPorCoSdeployment?（）

A.It must always be set on all QoS profile types because this sets the type of markings as either CoS or DSCP.
B.It is optional if the Cisco WLC attached switch operates on a trust DSCP model.
C.It must be set if the Cisco WLC attached switch operates on a trust CoS model.
D.It sets the EDCF queue used for the radio-transmitted frames.