Cisco 642-742 Online Practice Questions and Exam Preparation

Cisco 642-742 Online Questions & Answers

• Question 21:

  An engineer is configuring 802.11e to 802.1p markings for QoS on a Cisco WLC. What marking is correct for the AC_VI category?

  A. 3
  B. 4
  C. 5
  D. 6
  C. 5

• Question 22:

  VoIP clients can be impacted by jitter. Which of these statements best describes jitter?

  A. Jitter occurs because the receiver buffer is smaller than the sender buffer, thus packets are dropped and voice quality becomes worse.
  B. Jitter is defined as variation in the delay of received packets.
  C. Jitter can be reduced by designing cells that use only the 802.11a frequency band.
  D. A best practice to avoid jitter is to ensure that the end-to-end round-trip time does not exceed 150 ms.
  B. Jitter is defined as variation in the delay of received packets.

• Question 23:

  When setting up a VoWLAN deployment with Nokia E-Series dual-mode phones and Cisco 7925G phones, the engineer notices the Nokia phones work over cellular but fail over WiFi, whereas the Cisco phones work fine. What setting would cause this behavior?

  A. SSID set to non-broadcast
  B. SSID set to broadcast
  C. CCKM disabled
  D. CCKM enabled
  E. WPA Enterprise used
  F. WPA2 Enterprise used
  A. SSID set to non-broadcast

• Question 24:

  WLC v7.0 is properly configured for 802.11n and multicast video without the optional VideoStream. Which three of these options describe frames sent from the AP to wireless clients? (Choose three.)

  A. sent as gold QoS
  B. sent as best effort QoS
  C. sent at highest mandatory rate
  D. sent at lowest mandatory rate
  E. sent at client MCS data rate
  F. ACK per frame
  G. No ACKs
  B. sent as best effort QoS
  C. sent at highest mandatory rate
  G. No ACKs

• Question 25:

  Which two statements best describe streaming video? (Choose two.)

  A. Video streams require maximum quality compression and decompression.
  B. Video streams require a high speed of compression only.
  C. H.323 codecs are commonly used.
  D. MPEG codecs are commonly used.
  A. Video streams require maximum quality compression and decompression.
  D. MPEG codecs are commonly used.

• Question 26:

  A client's VoWLAN network requires fast roaming on legacy CCXv3 certified devices, which last received an update in 2007. What two fast roaming standards and authentication methods would be supported? (Choose two.)

  A. 802.11r with EAP-TLS
  B. 802.11r with EAP-FAST
  C. 802.11r with LEAP
  D. 802.11r with PEAP
  E. CCKM with EAP-TLS
  F. CCKM with EAP-FAST
  G. CCKM with LEAP
  H. CCKM with PEAP
  F. CCKM with EAP-FAST
  G. CCKM with LEAP

• Question 27:

  Which attribute does the VoWLAN Readiness Tool of WCS v7.0 use to predict acceptable conditions?

  A. SNR
  B. RSSI
  C. PER
  D. WMM
  E. QBSS
  B. RSSI

• Question 28:

  A company is deploying multicast over wireless that needs to be in a multicast-multicast mode. The access points are not receiving multicast traffic from the wireless controller. What command would display the needed information to determine if the AP has joined the multicast group?

  A. show ip igmp groups
  B. show ip mroute
  C. show ip route
  D. show ip multicast routing
  E. show igmp routes
  F. show pim multicast
  A. show ip igmp groups

• Question 29:

  The customer has deployed C7260 phones with clients connected to them. What switch feature could be enabled to distinguish IP voice traffic from client data traffic?

  A. QBSS
  B. WME
  C. QoS routing
  D. Weighted Queuing
  E. Voice VLAN
  E. Voice VLAN

• Question 30:

  A VoWLAN site survey was performed and equipment installed based on recommended design guidelines. Which two statements describe reasons to perform a post-deployment survey? (Choose two.)

  A. There is insufficient information about the number of people in the area when the survey is performed.
  B. There is insufficient information by AirMagnet VoFi Analyzer.
  C. There are elevator shafts.
  D. There are roaming pathways.
  E. There are changes in temperature in the indoor environment.
  A. There is insufficient information about the number of people in the area when the survey is performed.
  D. There are roaming pathways.