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2021 Dec 400-351 exam answers
Q1. Why would you enable the RFC 3578 option when adding a new RADIUS authentication server to a WLC?
A. you want to run both RADIUS and TACACS
B. to support Disconnect and Change of Authorization
C. to encrypt communications between the WLC and the RADIUS server
D. to support RADIUS key wrapping
Answer: B
Explanation:
If you are configuring a new RADIUS authentication server, choose Enabled from the Support for RFC 3576 drop-down list to enable RFC 3576, which is an extension to the RADIUS protocol that allows dynamic changes to a user session, or choose Disabled to disable this feature. The default value is Enabled. RFC 3576 includes support for disconnecting users and changing authorizations applicable to a user session and supports disconnect and change-of-authorization (CoA) messages. Disconnect messages cause a user session to be terminated immediately where CoA messages modify session authorization attributes such as data filters.
Q2. Your customer wants to configure LSCs and asks for specific information about which number to configure in the text box right next to the "Number of Attempts"
.Which statement is true?
A. The default number of attempts is 100.
B. A value of 2 means that if an AP fails to join the Cisco WLC using an LSC, the AP attempts to Join the Cisco WLC using the default certificate
C. A value of 255 means that if an AP fails to join the Cisco WLC using an LSC, the AP does not attempt to join the Cisco WLC using the default .
D. A value of 3 means that if a user fails to authenticate, the user is disconnected after three retries.
Answer: B
Q3. Which two statements are true based upon the output in the exhibit? (Choose two.)
A. Operation will be effective only if the video profile on the WLC is mapped to the 802.1p protocol with a tagged value of 5.
B. It is recommended to configure IP multicast on the WLC in multicast-multicast mode.
C. CAC must be enabled to avoid channel oversubscription and guarantee the configured media bandwidth.
D. In case of a violation after an RRC re-evaluation, the stream is demoted to the best- effort class.
Answer: B, ?
Q4. You are deploying cisco 792x wireless phones on your on your Cisco unified wireless network . Which two configuration setting are recomended?
A. Enable PSPF
B. Enable DTPC
C. Enable WMM
D. Enable PMF
Answer: B, C
Q5. Which two Characteristic of U-APSD are true ?(Chosse two)
A. U-APSD is enabled automatically when WMM is enabled
B. In addition to extending battery life, U-APSD increases the latency of the traffic flow delivered over the wireless media
C. U-APSD is configured on the access point switch port and supports the Power over Ethernet feature D. (Unscheduled automatic power save delivery) U-APSD is a Qos facility defined in IEEE 802.11e that extends the battery life of mobile clients
Answer: A, D
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Q6. After the AP mode is changed from local mode to bridge mode the AP cannot register the WLC considering the debug output into the exhibit .which description of the issue is true?
A. DTLS is not supported in bridge mode
B. The AP priority exceeds the number of joining APs
C. The AP MAC address is not added in the MAC filter list of the WLC
D. The date and time on the WLC and AP do not match
E. The AP does not have a valid certificate
F. The WLC does not have the image for the AP
Answer: C
Q7. Exhibit
A. Group Temporal Key
B. Pairwise Transient Key
C. Master Session Key
D. Pairwise Master Key
Answer: C
Q8. which two types of interface events are common for cleanAir?(choose two)
A. Microwave interference
B. Co-channel interference
C. Spontaneous interference
D. Persistent mterference
Answer: C, D
Q9. Which two AP join process are supported by the cisco 5760 WLC ?(choose Two)
A. Layer 2 CAPWAP discovery
B. Remotely stored controller IP address discovery
C. DNS discovery
D. Layer 3 CAPWAP discovery
Answer: C, D
Q10. 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