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Home Cisco® 400-351

Cisco® 400-351 Exam Practice Questions (P. 3)

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Question #21
The transmit power level on an 802.11a radio is configured for 25 mW. What is the corresponding value in decibels?
  1. A
    2.5 dBm
  2. B
    3 dBm
  3. C
    14 dBm
  4. D
    18 dBm
  5. E
    none of the above

Correct Answer:
C

Question #22
Users complain about intermittent wireless connectivity issues. You see the following message on your Cisco WCS, corresponding the time the connectivity issues occurred. AP 'building-1-entrance', interface '802.11b/g' on Controller '10.1.1.2'. Noise threshold violated.
What do you do?
  1. A
    Increase the interference threshold from the default 10%.
  2. B
    Use a spectrum analyzer to discover the noise source.
  3. C
    Check the logs for rogues in the area, and turn on rogue mitigation.
  4. D
    Increase the power of the APs in the entrance hall.

Correct Answer:
B

Question #23
Which environmental phenomena can cause considerable degradation to your wireless signals?
  1. A
    multipath, reflection, scattering, refraction
  2. B
    multipath, alpha particles, diversity, absorption
  3. C
    multipath, cosmic radiation, free path loss, scattering
  4. D
    multipath, convergence, refraction, gamma rays

Correct Answer:
A

Question #24
You are working for a South American services integrator. Your customer has a working unified Cisco WLC solution in Costa Rica (-A domain). You need to integrate an office in Panama (-N domain); correct APs are already deployed for this domain. Which approach do you take?
  1. A
    Do nothing. These APs will work on the same Cisco WLC because the countries are neighbors.
  2. B
    Change the APs in the Panama office to AIR-CAP3502E-N-K9, which have external antennae.
  3. C
    Use the config domain add -N command on the Cisco WLC.
  4. D
    Add the country code for Panama (PA) through the Cisco WLC web GUI.

Correct Answer:
D

Question #25
Which role does the Wi-Fi Alliance fulfill regarding WLANs?
  1. A
    creates global interoperability for wireless channels and spectrum
  2. B
    maintains and creates the protocol standards by which wireless devices work
  3. C
    ensures that wireless products that are available to consumers provide the features that the products claim to have
  4. D
    creates strict regulations

Correct Answer:
C

Question #26
One of your customers is thinking of deploying wireless in a building. Which two items should you establish in a pre-site survey? (Choose two.)
  1. A
    the exact channels that should be used
  2. B
    the agreed coverage areas for the design
  3. C
    the access security arrangements for getting into the building
  4. D
    the type of deployment (data-only service, voice service, or location services)
  5. E
    sources of RF interference

Correct Answer:
BD

Question #27
On AIR-CAP3500 Series APs, which AP mode allows you to intensively analyze the frequency spectrum and detect interferers?
  1. A
    Sniffer
  2. B
    Monitor
  3. C
    SE-Connect
  4. D
    Analyzer
  5. E
    Rogue Detector

Correct Answer:
C

Question #28
Your site has already been surveyed at 5 GHz for 802.11n VoWLAN services. Which services can you add safely, without conducting an additional site survey?
(Choose two.)
  1. A
    enhanced Layer 2 or Layer 3 security of the WLAN
  2. B
    optional MFP client protection for Cisco Client Extensions Version 5 clients
  3. C
    802.11n data services on the 2.4 GHz Frequency
  4. D
    802.11n voice services on the 2.4 GHz Frequency
  5. E
    new services (such as location) on both frequencies

Correct Answer:
AB

Question #29
Which type of indoor Cisco AP should you deploy to make use of spatial multiplexing?
  1. A
    AIR-LAP1242AG
  2. B
    AIR-BR1310G
  3. C
    AIR-LAP1131AG
  4. D
    AIR-LAP1252AG
  5. E
    AIR-LAP1524AG

Correct Answer:
D

Question #30
You are a wireless network administrator for a company that has installed a network that is based on Cisco WLC and uses Aironet 1140 Series APs. The clients are using the 2.4 GHz band and WPA TKIP for Layer 2 security. The president of the company reads a news article on the benefits of 802.11n and wants to deploy it at the office so that the company can use data rates of up to 150 Mb/s. What should you tell the president?
  1. A
    You need to change your Layer 2 security policy to WPA2 AES to achieve the 300 Mb/s data rate.
  2. B
    You need to purchase different APs because the 1140 Series supports only up to 54 Mb/s.
  3. C
    You need to change the client Layer 2 security to WPA2 TKIP.
  4. D
    You need to change the client Layer 2 security to open.
  5. E
    802.1n data rates are possible only on 5 GHz.
  6. F
    802.11n data rates are possible with the current client Layer 2 security, but for a theoretical data rate of 300 Mb/s, you need to use channel bonding, which is

Correct Answer:
A

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