Cisco 640-722 Online Practice Questions and Exam Preparation

Cisco 640-722 Online Questions & Answers

• Question 191:

  The introduction of consumer phones and tablets into enterprise WLANs can have an impact on 802.11a/b/g/n deployments. The Apple iPhone 4 and iPad 2 are very common examples.

  Which statement best describes the abilities of these devices?

  A. The Apple iPhone 4 and the iPad 2 use 2.4 GHz and 5 GHz. The Apple iPhone 4 uses only one spatial stream and the iPad 2 uses two spatial streams.
  B. The Apple iPhone 4 uses only 2.4 GHz and the iPad 2 only uses 5 GHz. The Apple iPhone 4 uses only one spatial stream and the iPad 2 uses two spatial streams.
  C. The Apple iPhone 4 uses 2.4 GHz and the iPad 2 uses 2.4 GHz or 5 GHz. The Apple iPhone 4 only uses one spatial stream and the iPad 2 uses two spatial streams.
  D. The Apple iPhone 4 uses 2.4 GHz and the iPad 2 uses 2.4 GHz or 5 GHz. The Apple iPhone 4 and the iPad 2 use only one spatial stream.
  D. The Apple iPhone 4 uses 2.4 GHz and the iPad 2 uses 2.4 GHz or 5 GHz. The Apple iPhone 4 and the iPad 2 use only one spatial stream.

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  The apple iPhone 4 and iPAD2 supports only 2.4 Ghz (no 5 Ghz) wireless networks. Support for 5Ghz networks was introduced with the Apple iPhone5 and the iPAD 3.

• Question 192:

  DRAG DROP

  Drag from the left the characteristics that are associated with the specific controller-based AP deployment mode and drop them in the appropriate category on the right.

  Select and Place:

  

  

• Question 193:

  What is a risk when initiating the containment of a rogue AP?

  A. disassociating clients of valid access points that are operated by a neighboring organization
  B. disrupting transmission of neighboring AP clients
  C. breaking the radio of the containing AP
  D. breaking the rogue client radio or its firmware
  A. disassociating clients of valid access points that are operated by a neighboring organization

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  Rogue Containment Caveats

  

  Because containment uses a portion of the managed AP's radio time to send the de- authentication frames, the performance to both data and voice clients is negatively impacted by up to 20%. For data clients, the impact is reduced throughput. For voice clients, containment can cause interruptions in conversations and reduced voice quality.

  

  Containment can have legal implications when launched against neighboring networks. Ensure that the rogue device is within your network and poses a security risk before you launch the containment.

  Reference: http://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/112045-handling-rogue-cuwn-00.html

• Question 194:

  Which type of basic radiation pattern does a Yagi antenna have?

  A. circular
  B. semicircular
  C. straight line
  D. cone
  D. cone

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  High gain directional antennas: A point to point high gain antenna is a directional antenna that has a focused radiation pattern. The radiation pattern is typically a cone 10 to 30 degrees wide. A yagi and a parabolic dish are examples of high gain directional antennas.

  Reference: http://www.hp.com/rnd/pdfs/antenna_tech_brief.pdf

• Question 195:

  Which two formats are available for Cisco WCS reports? (Choose two.)

  A. PDF
  B. CSV
  C. HTML
  D. TXT
  A. PDF
  B. CSV

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  Reports are saved in either CSV or PDF format and are either saved to a file on WCS for later download or e-mailed to a specific e-mail address.

  Reference: http://www.cisco.com/c/en/us/td/docs/wireless/wcs/7-0/configuration/guide/WCS70cg/7_0reps.html.

• Question 196:

  Which method of encryption does the 802.11i standard use?

  A. AES/CCMP
  B. AES/ECB
  C. AES/OCB
  D. TKIP
  E. both AES/ECB and AES/CCMP
  A. AES/CCMP

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  Counter Mode Cipher Block Chaining Message Authentication Code Protocol, Counter Mode CBC-MAC Protocol or simply CCMP (CCM mode Protocol) is an encryption protocol designed for Wireless LAN products that implement the

  standards of the IEEE 802.11i amendment to the original IEEE 802.11 standard. CCMP is an enhanced data cryptographic encapsulation mechanism designed for data confidentiality and based upon the Counter Mode with CBC-MAC (CCM)

  of the AES standard. It was created to address the vulnerabilities presented by WEP, a dated, insecure protocol.

  Reference: http://en.wikipedia.org/wiki/CCMP

• Question 197:

  Which type of frames are ACK and CF-ACK?

  A. control
  B. management
  C. RTS/CTS
  D. association
  A. control

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  Wireless LANs come in three frame types:

  

  Management frames: Used for joining and leaving a wireless cell. Management frame types include association request, association response, and reassociation request, just to name a few. (See Table 7-2 for a complete list.)

  

  Control frames: Used to acknowledge when data frames are received.

  

  Data frames: Frames that contain data.

  Frame Types Table Reference: http://www.ciscopress.com/articles/article.asp? p=1271797andseqNum=2

  

• Question 198:

  An engineer recently removed a WLC from a WCS, but the APs associated to the WLC are still showing on the WCS. What is a reason for this?

  A. The associated APs must be removed manually.
  B. The APs must be removed from the WCS map.
  C. The hold-down timer must expire before the APs will be removed.
  D. The APs must be audited.
  A. The associated APs must be removed manually.

• Question 199:

  What encryption standards describe WPA and WPA2?

  A. WPA mandates AES with TKIP optional, WPA2 mandates TKIP
  B. WPA mandates TKIP with AES optional, WPA2 mandates AES
  C. WPA mandates CKIP, WPA2 mandates AES
  D. WPA mandates CKIP with AES optimal, WPA2 mandates AES
  B. WPA mandates TKIP with AES optional, WPA2 mandates AES

• Question 200:

  

  

  In setting up the wireless network, it is desired that the DHCP server that is configured in WLC1 provides IP addressing to the WLAN. When devices attempt to join the network, they fail to receive an IP address in the range provided by the DHCP server in WLC1, but they do receive an IP address from the DHCP server in SW1. What is causing this issue?

  A. The external DHCP server in SW1 will always be the preferred DHCP server and WLC1 will always be the secondary DHCP server in the WLAN.
  B. The DHCP server address for SW1 needs to be removed from the DHCP server configuration in WLC1.
  C. The primary DHCP server address in WLC1 is incorrect.
  D. The primary DHCP server configured in WLC1 is not enabled.
  D. The primary DHCP server configured in WLC1 is not enabled.

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  This can be verified by the following screen shot, showing the DHCP server is disabled at the bottom: