[Free] Download Latest (May 2016) Cisco 642-742 Real Exam 61-70

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QUESTION 61

A wired packet that is marked for QoS priority CS4 arrives on VLAN-4 at Cisco WLC v7.0, with a destination of a WLAN SSID-4. The Cisco WLC is configured for the wired and wireless QoS level of Silver. The infrastructure routers and switches have incorrect QoS configurations. They have mismarked the CAPWAP outer header to a QoS priority EF. Which statement is true about how the packet is sent from the AP to the final WMM wireless client?

 

A.

The AP sends the packet with an 802.11 priority tag of 0 (Best Effort).

B.

The AP sends the packet with an 802.11 priority tag of 3 (Silver).

C.

The AP sends the packet with an 802.11 priority tag of 5 (Gold).

D.

The AP sends the packet with an 802.11 priority tag of 6 (Platinum).

 

Correct Answer: A

 

 

QUESTION 62

When reviewing a design for a voice over wireless deployment, what per-call bandwidth cost should be factored in when determining maximum calls per cell using SIP and G.711u as the codec?

 

A.

80 bytes

B.

64 bytes

C.

10 bytes

D.

8 bytes

 

Correct Answer: A

 

 

QUESTION 63

Which two statements are correct if IGMP snooping is enabled on a Cisco WLC v7.0? (Choose two.)

 

A.

The router IGMP table is updated with the IP address of the wireless clients as the last reporter.

B.

The IGMP packets from the wireless clients are forwarded to the router without modifications.

C.

The IGMP packets from the wireless clients are received at the Cisco WLC, which generates a query for the client.

D.

The IGMP packets from the wireless clients are received at the WLC and are used to update the router via a Cisco Group Management Protocol update from the Cisco WLC.

E.

The router IGMP table is updated with the IP address of the Cisco WLC as the last reporter.

Correct Answer: CE

 

 

QUESTION 64

You have recently enabled multicast on your WLAN. When users join the multicast sessions, you see the traffic utilization on all the APs that are controlled by the Cisco WLC v7.0 increase, which includes those APs where there are no multicast clients. Which configuration parameter needs to be verified to prevent APs with no subscribed multicast clients from receiving traffic?

 

A.

Switches between the Cisco WLC and APs are not configured for IGMP snooping.

B.

The router interface that services the multicast needs to be configured for the sparse- dense multicast mode of operation.

C.

APs are not configured for IGMP snooping.

D.

The Cisco WLC is not configured for IGMP snooping.

E.

This is normal operation and cannot be changed.

 

Correct Answer: D

 

 

QUESTION 65

A wired packet that is marked for QoS priority CS4 arrives on VLAN-4 at the Cisco WLC v7.0, with a destination of a WLAN SSID-4. The Cisco WLC is configured for the wired and wireless QoS level of Silver. The infrastructure routers and switches have incorrect QoS configurations. They have mismarked the CAPWAP outer header to a QoS priority EF. Which statement is true about how the packet is sent from the AP to the final non-WMM wireless client?

 

A.

The AP sends the packet with an 802.11 priority tag of 0 (Best Effort).

B.

The AP sends the packet with an 802.11 priority tag of 3 (Silver).

C.

The AP sends the packet with an 802.11 priority tag of 5 (Gold).

D.

The AP sends the packet with an 802.11 priority tag of 6 (Platinum).

 

Correct Answer: A

 

 

QUESTION 66

A customer reports that wireless clients are not able to receive multicast data from known working multicast servers on the wired network. The client is connecting at the highest mandatory wireless rate of 24 Mbps and the wireless controller is configured for multicast- unicast mode. What three actions should the engineer take next to troubleshoot the issue? (Choose three.)

 

A.

verify that the L3 interfaces are configured for pim sparse-dense-mode on the VLAN servicing the wireless access points as well as the wireless controller’s management VLAN

B.

change the wireless controller from Multicast-Unicast mode to Multicast-Multicast mode and assign a multicast address in the 239.X.X.X/8 subnet

C.

verify that IGMP snooping is disabled on the wireless controller since the access points are handling IGMP messages from the clients

D.

verify that Global Multicast mode has been enabled

E.

make sure the highest mandatory rate is set to 54 Mbps so that the multicast traffic has sufficient bandwidth

F.

verify Multicast Listener Discovery (MLD) v1 snooping has been enabled to keep track of and deliver IPv4 multicast flows

 

Correct Answer: ABD

 

QUESTION 67

What are the results that you can expect when performing a Cisco WLC v7.0 link test on a wireless IP phone?

 

A.

The device must be running at least Cisco Compatible Extensions v2 or higher, for the test and results to be successful.

B.

The device must be running at least Cisco Compatible Extensions v4 or higher, for the test and results to be successful.

C.

A device that is not running a version of Cisco Compatible Extensions will show only packets that are sent and received.

D.

A device that is not running a version of Cisco Compatible Extensions will show packets that are sent, packets that are received, local signal strength, and SNR.

 

Correct Answer: D

 

 

QUESTION 68

When a Vocera badge performs a broadcast call in a properly configured VoWLAN using WLC v7.0, which two choices indicate how the QoS is marked? (Choose two.)

 

A.

Upstream marked as Best Effort.

B.

Upstream marked as ToS CS4.

C.

Upstream marked as DSCP EF.

D.

Downstream marked as DSCP EF.

E.

Downstream marked as Best Effort.

F.

Downstream marked as Silver.

 

Correct Answer: CE

 

 

QUESTION 69

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?

 

clip_image002

 

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

 

Correct Answer: E

 

 

QUESTION 70

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.

 

Correct Answer: ACE

 

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