642-742 Latest Exam (Aug 2018)

[Free] 2018(Aug) Dumps4cert Cisco 642-742 Dumps with VCE and PDF Download 51-60

August 11, 2018

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Implementing Cisco unified Wireless Voice Networks (IUWVN) v2.0

Question No: 51

A network engineer is having wireless multicast fail when it hits the wired network. What command will show the source of multicast groups for troubleshooting?

  1. show ip igmp

  2. show ip mroute

  3. show ip mcache

  4. show ip interface counts

  5. show ip route

Answer: B

Question No: 52

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

  1. Video streams require maximum quality compression and decompression.

  2. Video streams require high-speed compression and decompression.

  3. H.323 codecs are commonly used.

  4. MPEG codecs are commonly used.

Answer: B,C

Question No: 53

A network engineer is configuring CAC on a WLC. If CAC is configured with 85% of the total radio bandwidth on a 5-GHz radio, how many clients can be accommodated?

  1. 5

  2. 12

  3. 15

  4. 22

Answer: D

Question No: 54

Which two VoWLAN configuration parameters are required to implement a Vocera Communications System on a Cisco WLC v7.0? (Choose two.)

  1. Enable WLC broadcast for WLANs.

  2. Enable WLC multicast for WLANs.

  3. Disable WLAN WMM.

  4. Adjust the radio EDCA profile.

  5. Enable WLAN WMM.

Answer: B,C

Question No: 55

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?

  1. show ip igmp groups

  2. show ip mroute

  3. show ip route

  4. show ip multicast routing

  5. show igmp routes

  6. show pim multicast

Answer: A

Question No: 56

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.)

  1. SSID has been configured to allow multicast-direct and multicast-direct has been enabled globally.

  2. IGMP snooping is turned off because the client cannot request to join a group, only access points can.

  3. Video-stream for the multicast video is configured in the controller.

  4. SSID has been set for a QoS value of Platinum.

  5. SSID has been set for a QoS value of Gold.

  6. RTSP is used to stream the video due to wireless multicast not using acknowledgements.

Answer: A,C,E

Question No: 57

Clients are experiencing artifacts in multicast video even though the network was recently upgraded to 802.11n APs. What three configuration changes will be most effective to improve performance? (Choose three.)

  1. increase mandatory data rate

  2. enable 40 MHz wide channels

  3. enable Call Admission Control

  4. increase QoS marking on multicast

  5. enable VideoStream

  6. disable Multicast Messaging

Answer: B,C,E

Question No: 58

Dumps4Cert 2018 PDF and VCE

Refer to the exhibit. A customer is experiencing poor call performance on their 7920 wireless phones. The engineer troubleshooting the issue has opened up Cisco Spectrum Expert to try and find the problems. Given this output, what is causing the interference?

  1. cordless phone

  2. Bluetooth device

  3. Xbox wireless controller

  4. microwave

  5. RFID

  6. jammer

Answer: A

Question No: 59

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?

  1. 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.

  2. 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.

  3. 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.

  4. 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.

Answer: A

Question No: 60

Which four hardware components are required to make an end-to-end unified wireless VoIP solution? (Choose four.)

  1. Cisco Mobility Services Engine server

  2. wireless IP phone

  3. firewalls

  4. CAPWAP access points

  5. Cisco Wireless Control System

  6. WLAN controller

  7. autonomous access points

  8. Cisco Unified Communications Manager

Answer: B,D,F,H

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