Download New Latest (May) Cisco 642-742 Actual Tests 11-20

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QUESTION 11

Which two statements correctly describe WLAN QoS configuration related to WMM? (Choose two.)

 

A.

7920 AP CAC mode is not compatible with WMM policy and cannot be used at the same time.

B.

7920 Client CAC mode is not compatible with WMM policy and cannot be used at the same time.

C.

7920 AP CAC and 7920 client CAC modes are for 802.11b/g/n only.

D.

7920 AP CAC and 7920 client CAC modes are for 802.11a/n only.

E.

7920 AP CAC and 7920 client CAC modes are for 802.11a/b/g/n.

 

Answer:
BC

 

 

QUESTION 12

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

 

Answer: ABC

 

 

QUESTION 13

The AP has been properly configured for a VoWLAN survey. The RF environment contains a noise of -87 to -90 dBm. What would be the target value for the cell edge reading?

 

A.

-55 dBm

B.

-60 dBm

C.

-62 dBm

D.

-67 dBm

E.

-70 dBm

F.

-73 dBm

 

Answer: C

 

 

QUESTION 14

Which two applications benefit from upgrading to 802.11n? (Choose two.)

 

A.

voice

B.

video

C.

database access

D.

digital imaging

E.

SMS

F.

email

 

Answer: BD

 

 

QUESTION 15

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.

 

Answer: B

 

 

QUESTION 16

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

 

A.

4

B.

7

C.

14

D.

20

E.

25

F.

27

 

Answer: D

 

 

QUESTION 17

WLCs v7.0 have been configured for multicast and IGMP snooping enabled, with all other parameters set to default. A wireless client actively receiving a multicast group roams from WLC1 to WLC2, both of which are configured for the client IP subnet. Which statement describes the roaming process?

 

A.

There is no required action from the client and WLC2 becomes the local anchor controller.

B.

A new IGMP packet is required from the client and WLC2 becomes the local anchor controller.

C.

There is no required action from the client and WLC2 becomes foreign controller and WLC1 becomes anchor controller.

D.

A new IGMP packet is required from the client and WLC2 becomes foreign controller and WLC1 becomes anchor controller.

 

Answer: A

 

 

QUESTION 18

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

 

Answer: B

 

 

QUESTION 19

Refer to the exhibit.

 

 

 

clip_image001

 

Which two statements describe the WLC configuration? (Choose two.)

 

A.

AP will effectively allow 75% of bandwidth for local new calls.

B.

AP will effectively allow 69% of bandwidth for local new calls.

C.

AP will effectively allow 81% of bandwidth for local new calls.

D.

Priority roaming calls can be expedited.

E.

Priority new calls can be expedited.

 

Answer: BE

 

 

QUESTION 20

Refer to the exhibit.

 

clip_image002

 

 

Voice-bearer traffic is being sent downstream using a WLAN configured for gold QoS. Which two of these options indicate the inner 802.11e QoS markings and QoS CAPWAP markings that are used at location 1? (Choose two.)

 

A.

Inner 802.11e: UP 5

B.

Inner 802.11e: UP 4

C.

Outer CAPWAP: CoS 4

D.

Inner 802.11e: UP 3

E.

Outer CAPWAP: DSCP AF31

F.

Outer CAPWAP: DSCP AF41

 

Answer: AF

 

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