单选题Which statement correctly describes a wireless client Layer 2 roam from AP1 to AP2 while joined to a multicast stream using Cisco WLC running v5.2?（）A Client issues an IGMP join after association with AP2, allowing AP2 to request a multicast stream fro

DTIM

Ethernet multicast mode

peer-to-peer block mode

RF group mode

DTPC

Client issues an IGMP join after association with AP2, allowing AP2 to request a multicast stream from  Cisco WLC after AP1 issues an IGMP query.

Client issues an IGMP join after association with AP2, allowing AP2 to request a multicast stream from  Cisco WLC independent of AP1 multicast member status.

Client resumes multicast after association with AP2,  because multicast information is sent in mobility  exchanges and AP2 is already a member of the multicast group,  provided that another client has  already joined that multicast.

Client resumes multicast after association with AP2,  because multicast information is sent in mobility  exchanges and AP2 is already a member of the multicast group,  regardless if any other clients have  already joined that multicast.

 1. Access point sends probe request .2. Client sends probe response.3. Client initiates  association.4. Access point accepts association.5. Client adds access point MAC address to  association table.

 1. Client sends probe request.2. Access point sends probe response.3. Client initiates  association.4. Access point accepts association.5. Access point adds client MAC address to  association table.

 1. Client sends probe request.2. Access point sends probe response.3. Access point initiates  association.4. Client accepts association.5. Access point adds client MAC address to association  table.

 1. Access point sends probe request .2. Client sends probe response.3. Client initiates  association.4. Access point accepts association.5. Access point adds client MAC address to  association table.

 1. Client sends probe request.2. Access point sends probe response.3. Client initiates  association.4. Access point accepts association.5. Client adds access point MAC address to  association table.

 None of the other alternatives apply.

IGMP snooping and Cisco Group Membership Protocol (CGMP) can be used simultaneously on a switch.

IGMP snooping a nd Cisco Group Membership Protocol (CGMP) were developed to help Layer 3 switches make intelligent forwarding decisions on their own.

IGMP snooping examines IGMP join/leave messages so that multicast traffic is forwarded only to hosts that sent an IG MP message toward the router.

IGMP snooping is an IP multicast constraining mechanism for Layer 2 switches.

IGMP snooping is enabled with the ip multicast - routing global configuration command.

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.

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.

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.

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.

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.

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.

H-REAP AP1 lost its connection to the controller.

H-REAP AP2 lost its connection to the controller.

H-REAP AP1 has reached its client limit.

H-REAP AP2 has reached its client limit.

Multicast traffic is sent out on Cisco APs at the highest mandatory data rate.

Multicast traffic is sent out on Cisco APs at the highest supported data rate.

On Cisco APs， multicast traffic and beacons are sent out at the same data rates to maintain a common  cell size for normal data as well as multicast data.

If there is more than one mandatory data rate， multicast traffic will be sent at the highest mandatory rate  and beacons will be sent at the lowest mandatory rate.

On Cisco APs， multicast traffic will be sent out at the highest data rate that a client can maintain with the  AP.

show {802.11a 802.11b} 2roam statistics 

show client roam-history 

show client tsm 802.11a/b/g  

show client detail 

show client ap-roam-history 

passed by the AP to its connected switch and then forwarded directly to the connected router，which  creates an MGID table entry

passed by the AP to the WLAN controller and then forwarded to the source PIM-enabled router，which  creates an MGID table entry

passed by the AP to the WLAN controller， which creates an MGID table entry before forwarding to the  directly connected PIM-enabled router

passed by the AP to its connected switch and then forwarded to the rendezvous point router，which  creates an MGID table entry

to determine if there are more clients that are using the multicast stream

to limit the time that a client has to request an IGMP join to the controller multicast group

to determine if the multicast router is still alive and responding to multicast clients

to remove clients from the multicast group if the multicast traffic exceeds the allotted bandwidth allowed  for multicast clients

RSSI of the client at the access point

WMM state

current MOS value

current RF channel

current transmit data rate

H-REAP AP1 has reached its client limit.

H-REAP AP2 has reached its client limit.

H-REAP AP2 lost its connection to the controller.

H-REAP AP1 lost its connection to the controller.