[Free] Download Latest (May 2016) Cisco 642-742 Real Exam 41-50

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QUESTION 41

Which mechanism detects if VoWLAN clients are experiencing poor signal-to-noise ratio values and causes the power of APs to increase as needed in order to rectify signal-to- noise issues?

 

A.

CCA

B.

RSSI

C.

802.11h

D.

CHD

E.

QBSS

Correct Answer: D

 

 

QUESTION 42

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

 

Correct Answer: C

 

 

QUESTION
43

A small wireless controller-based network is installed and configured inside a corporate building using Cisco 2500 Series controllers and 3500 Series APs using local, monitor, and rogue detector modes. All wireless clients have been working and now require multicast applications. WLC multicast is configured using multicast mode with IP address 239.10.10.10 and other parameters set to default. However, the wireless multicast traffic has limited success and does not work throughout the corporate building. What three actions can help resolve the problems? (Choose three.)

 

A.

Enable WLC IGMP snooping.

B.

Change WLC from multicast mode to Unicast mode in case of wired multicast infrastructure issues.

C.

Verify router and switch multicast configurations.

D.

Change all APs to just local and rogue detector modes.

E.

Change all APs to local mode and monitor mode.

F.

Change all APs to local mode.

G.

Increase the WLC-to-AP multicast QoS marking.

H.

Verify IP address and port used by the multicast application.

 

Correct Answer: CFH

 

 

QUESTION 44

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

 

Correct Answer: ABC

 

 

 

 

QUESTION 45

What are the benefits from enabling TSM for a VoWLAN using a WLC v7.0?

 

A.

provides packet loss and latency covering the end-to-end voice path on all links

B.

provides packet loss and latency covering the end-to-end voice path on all links and additional parameters on the VoWLAN segment

C.

provides packet loss covering the end-to-end voice path on all links and additional parameters on VoWLAN segment

D.

provides packet loss, latency, and additional parameters on VoWLAN call segment

 

Correct Answer: D

 

 

QUESTION 46

Refer to the exhibit. An engineer notices VoWLAN calls getting dropped and uses Spectrum Expert to analyze the RF utilization. Based on the Spectrum Expert capture, what two options describe the interferer and how to mitigate it? (Choose two.)

 

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A.

Radar interference

B.

Bluetooth interference

C.

microwave oven interference

D.

DECT 6.0 Cordless phone interference

E.

Disable UNII-2 channels

F.

Disable DFS

G.

Disable DCA

H.

Disable RRM

 

Correct Answer: AE

 

 

QUESTION 47

After enabling multicast direct on a WLAN set to Gold QoS, an engineer notices clients are not receiving the video correctly. What setting will correct this issue?

 

A.

enable best effort QoS Admission

B.

disable best effort QoS Admission

C.

change WLAN QoS to Platinum

D.

change WLAN QoS to Silver

E.

increase RRC Priority of Stream

F.

decrease RRC Priority of Stream

 

Correct Answer: A

 

 

QUESTION 48

Which two pieces of information from the Cisco WLC v7.0 GUI does Monitor > Clients provide about a VoWLAN client? (Choose two.)

 

A.

RSSI at current AP

B.

WMM state

C.

current MOS

D.

current RF channel

E.

current data rate

 

Correct Answer: AB

 

 

QUESTION 49

Which of these statements best describes Cisco Centralized Key Management?

 

A.

It allows wireless clients to cache their credentials so that, while they are roaming, they do not need to reauthenticate to the wireless infrastructure.

B.

It allows the wireless infrastructure to cache the credentials, thus eliminating the need to conduct a full reauthentication when roaming.

C.

It enables the controller to send directed roam requests to a client in situations when the controller can better service the client on a different AP than the one to which the client is associated.

D.

By caching their credentials, it helps clients save scanning time when looking for a new AP to join.

 

Correct Answer: B

 

 

QUESTION 50

Using proper VoWLAN design practice, what would be the Cisco recommended total number of calls for a properly designed 802.11g cell to ensure call quality?

 

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D.

A.

4

B.

7

C.

14

20

E.

25

F.

27

 

Correct Answer: C

 

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