What are three functions of the Cisco wireless LAN controller， 
which is being used in the Company  Centralized WLAN solution network？ （）

A. An access point will search for a controller using a broadcast address if using LWAPP Layer 2  and a unicast address if using LWAPP Layer 3 mode.
B. If multiple wireless controllers are detected by an access point， the controller with the fewest  associated access points is chosen to associate with.
C. In order to associate in Layer 3 mode， the access point must have been preconfigured with an  IP address.
D. Once an access point associates with a controller in LWAPP Layer 3 mode， it receives an IP  address from the controller.
E. An access point first searches for a controller in LWAPP Layer 2 mode. If the search is not  successful， the access point then attempts to locate a controller in LWAPP Layer 3 mode.
F. If multiple wireless controllers are detected by an access point， all of them will be used and  traffic will be load balanced.

A. The LAP will send out a DNS request. In return， the DNS server will provide the WLC domain  name.
B. The LAP will send out a Layer 3 LWAPP discovery request to the WLC on the wireless network. 
C. The LAP will send out a DHCP request. In return， the DHCP server will provide the IP  addresses for the LAP and the WLC.
D. The LAP will send out a Layer 2 LWAPP discovery request to the WLC on the wireless network.

A. Layer 3 addressing and distribution
B. SNMP monitoring services
C. Access point certification and software control
D. Packet encapsulation， fragmentation， and formatting
E. Compression and Layer 3 address mapping
F. User behaviors