[Free] Download Latest (May 2016) Cisco 642-742 Real Exam 91-100

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QUESTION 91

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.)

 

A.

increase mandatory data rate

B.

enable 40 MHz wide channels

C.

enable Call Admission Control

D.

increase QoS marking on multicast

E.

enable VideoStream

F.

disable Multicast Messaging

 

Correct Answer: BCE

 

 

QUESTION 92

Which statement best describes Cisco Centralized Key Management?

 

A.

It allows wireless clients to cache their credentials to prevent any reauthentication to the wireless infrastructure during a roaming event.

B.

It allows the wireless infrastructure to cache the credentials to eliminate the need for a full reauthentication when roaming.

C.

It allows controllers to send a directed roam request to a wireless client when a different AP can service the client better.

D.

It allows the wireless client to cache information from surrounding APs to reduce scan time before roaming.

 

Correct Answer: B

 

 

QUESTION 93

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

 

Correct Answer: A

 

 

QUESTION 94

When calculating bandwidth usage for an application, what two values represent the minimum and maximum 802.11 overhead per frame? (Choose two.)

 

A.

16 bytes

B.

24 bytes

C.

28 bytes

D.

48 bytes

E.

56 bytes

F.

60 bytes

G.

64 bytes

 

Correct Answer: CF

 

 

QUESTION 95

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

 

A.

Video streams require maximum quality compression and decompression.

B.

Video streams require a high speed of compression only.

C.

H.323 codecs are commonly used.< /p>

D.

MPEG codecs are commonly used.

 

Correct Answer: AD

 

 

QUESTION 96

In order to place a call, what is the first step that a wireless phone must do?

 

A.

Associate with the wireless infrastructure.

B.

Authenticate with the web authentication server.

C.

Update its firmware with the Call Manager.

D.

Register with a call agent.

 

Correct Answer: A

 

 

QUESTION 97

VoIP clients can be impacted by jitter. Which of these statements best describes jitter?

 

A.

Jitter occurs because the receiver buffer is smaller than the sender buffer, thus packets are dropped and voice quality becomes worse.

B.

Jitter is defined as variation in the delay of received packets.

C.

Jitter can be reduced by designing cells that use only the 802.11a frequency band.

D.

A best practice to avoid jitter is to ensure that the end-to-end round-trip time does not exceed 150 ms.

 

Correct Answer: B

 

 

QUESTION 98

A network engineer needs to reconfigure the WLAN settings on a 7925G phone, but the settings menu is locked. What key combo will unlock the menu?

 

A.

**#

B.

##*

C.

*#

D.

#*

 

Correct Answer: A

 

 

 

 

QUESTION 99

DRAG DROP

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Correct Answer:

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QUESTION 100

Wireless IP phone users are complaining that during the day there are certain points in the facility where voice quality is poor. How should you troubleshoot this issue?

 

A.

Perform a detailed analysis of the voice call quality from end to end.

B.

Ask the users to capture voice quality statistics from their wireless IP phones the next time they have issues.

C.

Go into the Cisco WLC and monitor client details for WMM issues.

D.

Locate the APs in question and use the Cisco WLC to enable TSM to capture WLAN voice traffic statistics.

 

Correct Answer: D

 

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