Update Cisco 400-351 study guides pdf

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Share some CCIE Wireless 400-351 exam questions and answers below.
Your customer is thinking of migrating the exiting IEEE 802.11b/g network to an IEEE 802.11ac network which two statement are true ?(choose two) 
A. Backward compatibility need to be considered for the existing legacy IEEE 802.11b/g mobile devices. 
B. Channel option are limited on the radio band UNII 3 due to DFS 
C. Ensure that the WLANs have WMM enabled and support open or WPA2/AES encryption 1n order to reach IEEE 802.11ac speeds even on IEEE. 802.11ac clients 
D. Fewer APs have to be proposed because the IEEE 802.llac network provides a faster speed and larger converge area compared with the IEEE 802.11b/g network. 
Answer: A,C

Which three statements about 802.11ac are true? (choose three) 
A. MU-MIMO is supported in wave 1 
B. MU-MIMO allows one AP to transmit unique data to multiple stations simultaneously 
C. when using MU-MIMI up to 8 devices can transmit data at the same time 
D. 802.11 a/b/g/n device are able to connect to 802.11ac radios 
E. it IS possible to reach 160 MHz by combining two discontinuous 80 MHz channel block 
F. 802.11 ac is supported in the 2.4- and 5-Ghz radio band 
Answer: B,D,E

In a VWLAN deployment, what autonomous ISO command should be used to ensure that VWLAN performance is not adversely impacted by an unexpected channel change resulting from a DFS event triggered by a nearby airport radar system? 
A. ap(config-if)#DFs band 1block 
B. ap(config-if)#DFs band 23 block 
C. ap(config-if)#DFs band 123 block 
D. ap(config-if)#DFs band 13 block 
E. ap(config-if)#DFs band 2 block 
Answer: B

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