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Home Cisco® 400-351

Cisco® 400-351 Exam Practice Questions (P. 4)

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Question #31
You have been hired to conduct a predeployment indoor wireless site survey. Which item is not needed before starting the project?
  1. A
    a statement of work that details the areas of the facility in which the customer wants to deploy wireless
  2. B
    architecture drawings of the facility
  3. C
    topographical maps
  4. D
    a list of client devices and applications that will use wireless at the facility
  5. E
    Layer 2 security requirements for the WLAN

Correct Answer:
C

Question #32
Which regulatory body develops standards for European information and communication technologies?
  1. A
    European Union
  2. B
    European Telecommunications Standards Institute
  3. C
    European Radio and Telecommunications Terminal Equipment Directive
  4. D
    International Organization for Standardization

Correct Answer:
B

Question #33
Refer to exhibit.
Which type of RF signature does the exhibit illustrate on channel 1?








  1. A
    broadcast probe flood
  2. B
    video camera
  3. C
    Wi-Fi inverted
  4. D
    NULL probe response
  5. E
    none of the above

Correct Answer:
B

Question #34
ABC Company end users are reporting voice roaming issues. Which two situations are possible causes? (Choose two.)
  1. A
    The RF coverage cells have only 10-percent overlap; 15- to 20-percent cell overlap is typically needed for seamless roaming.
  2. B
    The RF coverage is colocated.
  3. C
    There is interference from a 5 GHz DECT-like phone.
  4. D
    The RF coverage cells have only 20-percent overlap; 25- to 30-percent cell overlap is typically needed for seamless roaming.
  5. E
    There is interference from the cellular network.

Correct Answer:
AC

Question #35
After interviewing the customer to understand its wireless client requirements, you determine that 802.11b must be enabled to support legacy clients within a mixed-mode environment. What recommendation will have the greatest mitigation on the effects of 802.11b clients on the rest of the network?
  1. A
    Restrict the use of OFDM modulation.
  2. B
    Make 11 Mb/s the lowest mandatory rate.
  3. C
    Enable a separate SSID for 802.11b clients.
  4. D
    Enable short preamble.

Correct Answer:
B

Question #36
Which of the below devices can cause unintentional RF jamming attacks against an 802.11 wireless network? (Choose two.)
  1. A
    Rogue Access Points
  2. B
    Microwave Oven
  3. C
    Radar
  4. D
    900 Mhz cordless phones

Correct Answer:
BC

Question #37
When conducting a greenfield RF site survey with multiple APs, which information element should be enabled to ensure your site survey software will display the hostname of each AP?
  1. A
    IE 0
  2. B
    IE 1
  3. C
    IE 133
  4. D
    IE 221

Correct Answer:
C

Question #38
Corporation XYZ has 25 buildings (with a total of 12000 employees) and would like to implement a single SSID across their entire site. Which feature would be helpful to prevent wireless internet access from 1 of the 25 buildings?
  1. A
    AP groups
  2. B
    AAA override
  3. C
    WLAN override
  4. D
    MAC filtering

Correct Answer:
A

Question #39
Which three of these are considered Cisco RF guidelines for a proper VoWLAN deployment? (Choose three.)
  1. A
    Cell edge should be -67 dBm with 20 to 30 percent overlap.
  2. B
    Channel utilization should be kept under 30 percent.
  3. C
    Noise levels should not exceed -92 dBm.
  4. D
    Packet loss should not exceed 5 percent.
  5. E
    Jitter should be kept at a minimum (less than 300 ms).
  6. F
    802.11 retransmissions should be less than 20 percent.

Correct Answer:
ACF

Question #40
Which IEEE standard allows for the use of multiple 2-MHz communication channels within the 2.4-GHz spectrum?
  1. A
    802.14
  2. B
    802.15.4
  3. C
    802.16.1
  4. D
    802.18
  5. E
    802.19

Correct Answer:
B

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