Cisco 642-742 Online Practice Questions and Exam Preparation

Cisco 642-742 Online Questions & Answers

• Question 161:

  Assuming 30% total overhead and no other clients on an AP, how many single stream 802.11n 2.4GHz IP cameras that output a 6 Mbps video feed could one 802.11n AP support?

  A. 4 cameras
  B. 8 cameras
  C. 12 cameras
  D. 16 cameras
  B. 8 cameras

• Question 162:

  Which two configurations can resolve one-way audio in WLANs? (Choose two.)

  A. DTPC
  B. TPC on AP
  C. Platinum QoS in the WLAN
  D. admission control
  E. maximum transmit power
  A. DTPC
  B. TPC on AP

• Question 163:

  Which one of these options best describes the ideal WLAN design for wireless VoIP clients?

  A. smaller cells with all configurable speeds to ensure that all clients (802.11a/b/g) can associate to the wireless infrastructure
  B. smaller cells with higher speeds and CAC-enabled prioritization of WMM clients
  C. larger cells with higher speeds and WPA2 security enabled to ensure the best possible coverage
  D. smaller cells with APs in the inner areas using omnidirectional antennas, and APs on the outer walls using directional antennas facing inward
  B. smaller cells with higher speeds and CAC-enabled prioritization of WMM clients

• Question 164:

  When designing the coverage area for high call capacity, what two actions should you take with data rates and channels? (Choose two.)

  A. Avoid channels with high AP co-channel interference.
  B. Use channels with high AP co-channel interference to avoid channel roaming.
  C. Set the 2.4-GHz data rate of 5.5 Mb/s to required.
  D. Use 5-GHz channels when possible.
  E. Use 2.4-GHz channels when possible.
  A. Avoid channels with high AP co-channel interference.
  D. Use 5-GHz channels when possible.

• Question 165:

  Refer to the exhibit.

  

  Which two statements describe information that you can derive from the WCS v7.0 output from the Monitor Client Detail? (Choose two.)

  A. Comparing the RSSI and SNR can provide specific information on where the client has roamed and if there is a problem with one or more AP configurations.
  B. Comparing the information to the location of the client can provide the first hint of voice-related issues.
  C. If the parameters are consistently good, then voice-related issues being reported by users are probably not related to RF parameters.
  D. Comparing the RSSI and SNR can provide specific information on QoS performance in the VoWLAN.
  E. Comparing the RSSI and SNR can provide specific information on the relative distance of the client from the AP during a call.
  B. Comparing the information to the location of the client can provide the first hint of voice-related issues.
  C. If the parameters are consistently good, then voice-related issues being reported by users are probably not related to RF parameters.

• Question 166:

  VoWLAN implementation plans for a current mix of existing Cisco Unified Wireless IP Phones 7920G and 7921G to a final migration of Wireless IP Phones 7925G in a single WLAN. What would be the most appropriate WLC WLAN configuration to end with Wireless IP Phones 7925G?

  A. 7920 Client CAC = enabled only; Radio Policy = All; WMM = Disabled
  B. 7920 AP CAC = enabled only; Radio Policy = All; WMM = Allowed
  C. 7920 Client CAC = enabled only; Radio Policy = 802.11a only; WMM = Disabled
  D. 7920 AP CAC = enabled only; Radio Policy = 802.11a only; WMM = Allowed
  E. 7920 Client CAC = enabled only; Radio Policy = 802.11b/g only; WMM = Disabled
  F. 7920 AP CAC = enabled only; Radio Policy = 802.11b/g only; WMM = Allowed
  B. 7920 AP CAC = enabled only; Radio Policy = All; WMM = Allowed

• Question 167:

  Which three options are benefits of U-APSD? (Choose three.)

  A. synchronization of the transmission and reception of voice frames
  B. bandwidth reservation
  C. optimized power-save mode periods
  D. increased call capacity
  E. priority bandwidth and polling
  A. synchronization of the transmission and reception of voice frames
  C. optimized power-save mode periods
  D. increased call capacity

• Question 168:

  Users are experiencing poor audio quality when calling from their 7925 series VoIP Phones. Call quality is exceptional from wired to wired phones, but not from wired to wireless phones. The wired network has QoS deployed properly and the SSID is configured with Platinum QoS. What should be verified to troubleshoot the issue?

  A. The controller is marking the 802.1p tag of 3, the AP switchport has been configured to trust DSCP, and the controller's switchport to trust CoS.
  B. The controller is marking the 802.1p tag of 4, the AP switchport has been configured to trust CoS, and the controller's switchport to trust DSCP.
  C. The controller is marking the 802.1p tag of 5, the AP switchport has been configured to trust DSCP, and the controller's switchport to trust CoS.
  D. The controller is marking the 802.1p tag of 6, the AP switchport has been configured to trust CoS, and the controller's switchport to trust DSCP.
  C. The controller is marking the 802.1p tag of 5, the AP switchport has been configured to trust DSCP, and the controller's switchport to trust CoS.

• Question 169:

  A customer using a 7925 phone reports that sometimes the music on hold does not come through or is choppy. The engineer checks the location history and notices it tends to occur toward the edge of the cell. The APs have their data rates set to 12Mbps as mandatory where all rates below are disabled. What is the cause of this issue?

  A. beacons have been disabled
  B. mandatory data rates set too high
  C. the phone requires the 11Mbps rate
  D. unicast is enabled
  B. mandatory data rates set too high

• Question 170:

  A wireless customer has called with a problem regarding voice calls. When a person is put on hold, there is silence and the music on hold does not come across. What is a requirement of music on hold?

  A. Multicast routing should be configured at least to the wireless controller and client dynamic interfaces.
  B. There needs to be multicast routing configured network wide from the access point to the wireless controller.
  C. The wireless voice network needs to be configured for a QoS of platinum to permit the multicast traffic.
  D. The music on hold's multicast address needs to be configured for multicast direct.
  A. Multicast routing should be configured at least to the wireless controller and client dynamic interfaces.