Cisco 400-351 Dumps For Preparation

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Question No. 1

Refer to the exhibit.

An apple TV is associated to the wireless network wireless attempt to connect to it but they report that cannot discover the apple TV on their devices what is most likely the root cause ?

Answer: D

Question No. 2

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.)

Answer: B, E

Question No. 3

Refer to exhibit.

The dynamic interfaces shown above are bound to an interface group for a specific WLAN profile in the Cisco Wireless LAN Controller You notice duplicated multicast streams on the wireless medium for the given WLAN profile Which statement is correct?

Answer: B

Question No. 4

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?

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%


Question No. 5

If a guest anchor controller is used outside the firewall. Which firewall ports must you open for guest access including SNMP and mobility failover features to work in a Cisco Unified Wireless Network?

Answer: C

Question No. 6

You must configure user management access on Cisco Prime Infrastructure Each user that requires access belongs to a department and each department needs to have specific access. Which configuration in Cisco Prime is the best way to easily administer these users?

Answer: C

Question No. 7

Which two objects are considered node metrics in RPL? (Choose two.)

Answer: A, C

Question No. 8

Which two impact dose TSPEC admission controlhave as it relates to 802.11e clients? (choose two)

Answer: A, B

Question No. 9

Which statement about 802.11h is true?

Answer: A



802 .llh-2003-Wikipedia, the free encyclopedia

The standard provides Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC) to the 802.11a PHY. It has been integrated into the full IEEE 802.11-2007 standard.

FCC Regulations Update –Cisco

Question No. 10

Which statement is true about using fast-secure roaming 802.11r and Cisco Centralized Key Management in a hybrid VoWLAN deployment that has legacy Cisco 7925 and newer Cisco 8821 wireless IP phones, using 802.1X PEAP security?

Answer: D

Question No. 11

In a Cisco ACI environment, which option best describes “contracts”?

Answer: A, C

Question No. 12

Which three statements about 802.11ac are true? (choose three)

Answer: B, D, E

Question No. 13

Which two statements about a FlexConnect AP are true? (Choose two )

Answer: A, B

Question No. 14

Which three common network transport ingredients for hybrid and multicloud networking are true? (Choose three.)

Answer: A, C, E

Question No. 15

You are deploying a high-density wireless setup in a conference center using Cisco Aironet 3700iAPs as you have no Cisco air not 3700e APs available. The power levels for all the APs should be set between 4 and 5 which configuration option is needed to achieve this goal.?

Answer: B

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