Try Cisco 400-351 Exam Questions – (Dec-2017 Dumps)

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400-351 exam questions, 400-351 PDF dumps; 400-351 exam dumps:: (274 Q&A) (New Questions Are 100% Available! Also Free Practice Test Software!)

Latest and Most Accurate Cisco 400-351 Dumps Exam Questions and Answers:

Version: 15.0
Question: 21

Which two features were added as part of the 802.llh amendment?

A. Dynamic Frequency Selection and Direct Link Setup.
B. Dynamic Frequency Selection and Transmit Power control.
C. Dynamic Frequency Selection and Wireless Performance Prediction.
D. Dynamic Frequency Selection and Inter-Access Point Protocol.

Answer: B


Question: 22

VLAN Trunking Protocol is a Cisco proprietary protocol that propagates the definition of VLANs over the local area network. Which two statements are true?(Choose two.)

A. VTP requires access mode interfaces to propagate.
B. VTP requires trunk mode interfaces to propagate.
C. VTP transparent mode forwards VTP packets and can act as a client or a server.
D. VTP config revision increases base on switch uptime.
E. When Cisco switches are started from scratch, they are in server mode and their domain is set to null.

Answer: BE

Question: 23

New Updated 400-351 Exam Questions 400-351 PDF dumps 400-351 practice exam dumps:

You are getting the following error message. Which reason for this issue true?
%DOT11-4-CANT_ASSOC Interface Dot 11 Radio0. Cannot associate NO Aironet Extension IE.

A. “dot11 extension ” is missing under the interface Dot11Radio 0 interface.
B. When repeater mode is used, unicast-flooding must be enabled to allow Aironet IE communications.
C. The parent AP MAC address has not been defined.
D. Repeater mode only works between Cisco access point.

Answer: A


Question: 24

You have received a new Cisco 5760 Controller and have gone through the initial startup wizard. You are now trying to add APs to the controller, but these are not joining.
Which three checks should you do next? (Choose three.)

A. Check that the radios are not in a shutdown state.
B. Check the country code of the controller. The APs do not join the controller if the country code does not match.
C. Check that the correct time is set on the controller.
D. Check that option 53 has been set in the DHCP scope.
E. Check that the controller has enough AP licenses.
F. Check that the controller has been configured with the correct hostname. Otherwise, DNS resolution fails.

Answer: BCE


Question: 25

You are installing Converged Access controllers that run Cisco IOS-XE and you are ready to implement QoS. From the below, choose all the possible QoS target levels that would apply to downstream traffic (toward the client)?

A. Client, SSID, Radio, Port
B. Client, SSID, Radio
C. Client, Radio
D. Client, SSID

Answer: A


Question: 26

Which memchanism incorporates the channel capacity into the CAC determination and gives a much more accurate assessment of the current call carrying capacity of the AP?

A. Static CAC.
B. Reserved roaming bandwidth(%).
C. Expedited bandwidth.
D. Metrics collection.
E. Load-based AC.
F. Max RF bandwidth (%).
G. Admission control.

Answer: E

AP Call Capacity
A key part of the planning process for a VoWLAN deployment is to plan the number of simultaneous voice streams per AP. When planning the voice stream capacity of the AP, consider the following points:

Note: A call between two phones associated to the same AP counts as two active voice streams.
The actual number of voice streams a channel can support is highly dependent on a number of issues, including environmental factors and client compliance to WMM and the Cisco Compatible Extension specifications. Figure 9-11 shows the Cisco Compatible Extension specifications that are most beneficial to call quality and channel capacity. Simulations indicate that a 5 GHz channel can support 14-18 calls. This means a coverage cell can include 20 APs, each operating on different channels, with each channel supporting 14 voice streams. The coverage cell can support 280 calls. The number of voice streams supported on a channel with 802.11b clients is 7; therefore, the coverage cell with three APs on the three non-overlapping channels supports 21 voice streams.
Figure 9-11 Cisco Compatible Extension VoWLAN Features

Call Admission Control (CAC) also benefits call quality and can create bandwidth reservation for E911 and roaming calls.
The 802.11e, WMM, and Cisco Compatible Extension specifications help balance and prevent the overloading of a cell with voice streams. CAC determines whether there is enough channel capacity to start a call; if not, the phone may scan for another channel. The primary benefit of U-ASPD is the preservation of WLAN client power by allowing the transmission of frames from the WLAN client to trigger the forwarding of client data frames that are being buffered at the AP for power saving purposes. The Neighbor List option provides the phone with a list that includes channel numbers and channel capacity of neighboring APs. This is done to improve call quality, provide faster roams, and improve battery life.
Understanding Static CAC
As mentioned previously, there are two types of Admissions Control. Static CAC is based on a percentage of the total Medium Times available and is measure in increments of 32 microseconds. In this section, we will cover how to configure Static and Load-Based CAC and also how to debug it.
Load-Based CAC on the other hand is significantly more difficult to debug. LBCAC is dynamic with regard to the algorithm used to decrement Medium Times from the total that is available. LBCAC takes into consideration different metrics, such as load, Co-channel interference, SNR, etc. and will therefore yield different results when tested. From our experience, it is very difficult to yield consistent results as RF fluctuates and changes within the given environment. Results tend to vary from one cell area to another and even in cell areas that yield the same signal strength.
o enable video CAC for this radio band, check the Admission Control (ACM) check box. The default value is disabled.
n the Reserved Roaming Bandwidth field, enter the percentage of maximum allocated bandwidth reserved for roaming video clients. The controller reserves this much bandwidth from the maximum allocated bandwidth for roaming video clients.
Range: 0 to 25%
Default: 0%
in the Reserved Roaming Bandwidth field, enter the percentage of maximum allocated bandwidth reserved for roaming voice clients. The controller reserves this much bandwidth from the maximum allocated bandwidth for roaming voice clients.
Range: 0 to 25%
Default: 6%
To enable expedited bandwidth requests, check the Expedited Bandwidth check box.
The default value is disabled.
To enable TSM, check the Metrics Collection check box. The default value is disabled.
Traffic stream metrics (TSM) can be used to monitor and report issues with voice quality.
In the Max RF Bandwidth field, enter the percentage of the maximum bandwidth allocated to clients for voice applications on this radio band. Once the client reaches the value specified, the access point rejects new calls on this radio band.
Range: 40 to 85%
Default: 75% -book/vowlan_ch8.pdf

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