Cisco 642-742 Online Practice Questions and Exam Preparation

Cisco 642-742 Online Questions & Answers

• Question 11:

  Your Cisco Unified Wireless IP Phones 7921G and 7925G are associated with the VoWLAN at your branch office. When they attempt to place a call, the call fails to go through and you receive a fast busy tone. What is the issue?

  A. The wireless phones failed to register with the Cisco Unified Communications Manager cluster.
  B. The Cisco Unified Communications Manager cluster invoked CAC to preserve IP WAN voice bandwidth.
  C. The local gateway rejected the call because of high IP WAN utilization.
  D. Automatic alternate routing has been invoked.
  B. The Cisco Unified Communications Manager cluster invoked CAC to preserve IP WAN voice bandwidth.

• Question 12:

  A single Layer 2 multicast address can map to how many IPv4 multicast addresses?

  A. 1
  B. 8
  C. 16
  D. 28
  E. 32
  F. 64
  E. 32

• Question 13:

  Dual-mode phone users are requesting the ability to transfer calls from VoIP to cellular and the engineer has decided to implement the Handoff DN method. What information is required by the Call Manager?

  A. incoming caller ID
  B. outgoing caller ID
  C. SIP connection to cell provider
  D. H.323 connection to cell provider
  A. incoming caller ID

• Question 14:

  Refer to the exhibit.

  

  Voice signaling traffic is being sent upstream using a WLAN configured for bronze QoS. Assume that Layer 3 switches between the controller and the AP use the default and recommended CoS-to-DSCP and DSCP-to-CoS maps. What CAPWAP QoS markings are used in the header at location 1?

  A. DSCP CS1
  B. CoS 1
  C. DSCP 46 and CoS 5
  D. CoS 3
  E. DSCP CS1 and CoS 1
  F. DSCP 46
  G. DSCP AF31
  H. DSCP AF31 and CoS 3
  E. DSCP CS1 and CoS 1

• Question 15:

  Which two security technologies should be used when deploying a 100 Wi-Fi phone installation? (Choose two.)

  A. Use WPA-PSK.
  B. Use IEEE 802.1X with unique users on each phone.
  C. Use the same IEEE 802.1X username on all phones.
  D. Use IEEE 802.1X and WEP 128.
  E. Use IEEE 802.1X and WEP 256.
  F. Use IEEE 802.1X and WPA2 and Cisco Centralized Key Management.
  B. Use IEEE 802.1X with unique users on each phone.
  F. Use IEEE 802.1X and WPA2 and Cisco Centralized Key Management.

• Question 16:

  WLC v7.0 is configured for multicast with WLC-to-AP multicast mode, using IP address 239.10.10.10 and IGMP snooping enabled, with all other parameters set to default. What QoS value is given to multicast traffic between a WLC and APs?

  A. CS6
  B. EF
  C. CS5
  D. CS4
  E. CS3
  F. CS2
  G. CS1
  H. BE
  H. BE

• Question 17:

  A customer has configured a wireless LAN controller and set the 802.11a/n data rates. All rates are enabled where 5.5 Mbps, 11 Mbps, and 24 Mbps are set to Mandatory. What will APs send over the 24 Mbps data rate?

  A. channel announcements
  B. beacons
  C. DTPC support
  D. multicast broadcast
  D. multicast broadcast

• Question 18:

  A client reports that video is not streaming. The administrator determines the client is connecting at a data rate of 12 Mbps and is trying to stream to a valid multicast address on the network. What three items should the administrator check next to troubleshoot the issue? (Choose three.)

  A. SSID has been configured to allow multicast-direct and multicast-direct has been enabled globally.
  B. IGMP snooping is turned off because the client cannot request to join a group, only access points can.
  C. Video-stream for the multicast video is configured in the controller.
  D. SSID has been set for a QoS value of Platinum.
  E. SSID has been set for a QoS value of Gold.
  F. RTSP is used to stream the video due to wireless multicast not using acknowledgements.
  A. SSID has been configured to allow multicast-direct and multicast-direct has been enabled globally.
  C. Video-stream for the multicast video is configured in the controller.
  E. SSID has been set for a QoS value of Gold.

• Question 19:

  A customer requests that wireless infrastructure is able to support video over wireless for streaming corporate informational videos for new-hire employees. What two minimum requirements should be met when laying out the guidelines to support video streaming? (Choose two.)

  A. acceptable delay for video should not exceed 4 to 5 seconds
  B. acceptable delay for video should not exceed 150ms
  C. loss rate should not exceed 1%
  D. the loss rate should not exceed 5%
  E. acceptable delay for video should not exceed 9 to 10 seconds
  F. no loss should occur
  A. acceptable delay for video should not exceed 4 to 5 seconds
  D. the loss rate should not exceed 5%

• Question 20:

  Controllers in a mobility group must all have which of these characteristics in common?

  A. mobility group name, version of controller code, and Control and Provisioning of Wireless Access Points mode
  B. mobility domain name, version of controller code, Control and Provisioning of Wireless Access Points mode, ACLs, and WLANs (SSIDs)
  C. mobility group name, version of controller code, Control and Provisioning of Wireless Access Points mode, ACLs, and WLANs (SSIDs)
  D. mobility domain name, version of controller code, and Control and Provisioning of Wireless Access Points mode
  C. mobility group name, version of controller code, Control and Provisioning of Wireless Access Points mode, ACLs, and WLANs (SSIDs)