Cisco 642-742 Online Practice Questions and Exam Preparation

Cisco 642-742 Online Questions & Answers

• Question 131:

  A Cisco WLC v7.0 is configured with the default setting for wired and wireless QoS. When a wireless client sends a voice packet to the AP, how does the AP mark the outer CAPWAP header when the packet is sent to the Cisco WLC v7.0?

  A. The AP uses the wireless priority value to create a matching 802.1p value in the CAPWAP header.
  B. The AP uses the wireless priority value to create a matching DSCP value in the CAPWAP header.
  C. The AP uses the wireless priority value to create both a matching 802.1p and DSCP value in the CAPWAP header.
  D. The AP does not match the value to the CAPWAP header, which results in best effort.
  D. The AP does not match the value to the CAPWAP header, which results in best effort.

• Question 132:

  Which three call information items does AirMagnet VoFi Analyzer provide? (Choose three.)

  A. the codec used by the calling phone
  B. approximate length of the call in minutes
  C. MOS values throughout the duration of the call
  D. 802.11e access category overruns
  E. co-channel interference percentage during the call
  A. the codec used by the calling phone
  B. approximate length of the call in minutes
  C. MOS values throughout the duration of the call

• Question 133:

  What is the best practice for setting the WLC v7.0 use of WLAN QoS settings to support SIP phones on a VoWLAN?

  A. Configure SIP with static CAC only with SIP call snooping.
  B. Configure SIP with static CAC only without SIP call snooping.
  C. Configure SIP with load-based CAC only with SIP call snooping.
  D. Configure SIP with load-based CAC only without SIP call snooping.
  E. Configure SIP with load-based CAC and TSPEC only with SIP call snooping.
  A. Configure SIP with static CAC only with SIP call snooping.

• Question 134:

  Which three WLC actions are required to properly enable queuing with TSPEC for voice traffic? (Choose three.)

  A. configure WLAN setting to enable WMM
  B. configure WLAN Aironet information elements to enabled
  C. configure global 802.11b/g or 802.11a, or both, to voice CAC
  D. configure WLAN platinum QoS
  E. configure DTIM = 2
  A. configure WLAN setting to enable WMM
  C. configure global 802.11b/g or 802.11a, or both, to voice CAC
  D. configure WLAN platinum QoS

• Question 135:

  A customer is having issues streaming video over wireless in a few high-density areas of their campus. After further investigation, the administrator has singled out the issue pertains to the clients associated to 802.11b/g only access points. The rest of the campus is covered in 802.11n access points. What is a possible reason for the issue with video streaming on the 802.11b/g access points as opposed to the 802.11n access points?

  A. Due to the High-Density environment, there was high-utilization of the wireless spectrum. With 802.11n. the access points are able to aggregate the MSDU and MPDU frames into A-MSDU and A- MPDU frames, utilizing less airtime to transfer data.
  B. The wireless clients were all transmitting at 802.11b data rates and would have operated properly had they been transmitting and receiving at 802.11g rates.
  C. The clients could not transmit data at the highest mandatory rate of 54 Mbps due to limitations with 802.11b/g. This data-rate is only possible when transmitting at 802.11n speeds.
  D. The wireless controller was denying the client access to the video due to multicast-direct supporting the PHY rate of 48000 that the 802.11b/g client could not handle.
  A. Due to the High-Density environment, there was high-utilization of the wireless spectrum. With 802.11n. the access points are able to aggregate the MSDU and MPDU frames into A-MSDU and A- MPDU frames, utilizing less airtime to transfer data.

• Question 136:

  Refer to the exhibit.

  

  What two items need to be supported on the VoWLAN phones in order to take full advantage of this WLAN configuration? (Choose two.)

  A. 802.11e
  B. WMM
  C. 802.11a
  D. 802.11r
  E. APSD
  F. SIFS
  A. 802.11e
  B. WMM

• Question 137:

  Which DHCP option is used by Vocera badges to reach a Cisco Unified Communications Manager?

  A. Set the option to 66.
  B. Set the option to 43.
  C. Set the option to 150.
  D. No option is required.
  D. No option is required.

• Question 138:

  An engineer has fired up a packet capture to try to determine if there are malformed frames being transmitted. They notice that there is a station transmitting frames consecutively without giving other stations a chance to transmit. What capability is the engineer witnessing?

  A. 802.11 fragment burst
  B. 802.11e priority contention window
  C. Aggregated MPDU
  D. Extended Interframe Space
  A. 802.11 fragment burst

• Question 139:

  A customer has requested their wireless infrastructure to be able to provide voice phones with the ability to indicate to a wireless controller that the call is urgent and needs to be placed immediately. What solution should be recommended to the customer?

  A. enable load-based CAC for voice networks and configure expedited bandwidth
  B. disable load-based CAC for voice networks to turn off the controllers monitoring of the access point's load, allowing for as many voice calls to be placed as necessary
  C. configure expedited bandwidth and change the 802.1p value to 7 for platinum QoS
  D. reconfigure the SSID for KTS based CAC to allow for a more granular handling of voice traffic
  A. enable load-based CAC for voice networks and configure expedited bandwidth

• Question 140:

  A Cisco WLC v7.0 is properly configured for 802.11n and multicasting video without the optional Cisco VideoStream. Which three options best describe the frames that are sent from the AP to the wireless clients? (Choose three.)

  A. unicast to subscribed clients
  B. multicast to subscribed clients
  C. After startup, throughput is consistent.
  D. After startup, throughput can vary over time.
  E. retransmission upon failure of delivery
  F. no retransmission
  B. multicast to subscribed clients
  D. After startup, throughput can vary over time.
  F. no retransmission