最新的Cisco 642-742免費考試真題

問題1

A Cisco WLC v7.0 is properly configured for 802.11n and multicasting video without the optional Cisco VideoStream. Which three options best describe the frames that are sent from the AP to the wireless clients? (Choose three.)

A. After startup, throughput can vary over time.

B. After startup, throughput is consistent.

C. unicast to subscribed clients

D. multicast to subscribed clients

E. no retransmission

F. retransmission upon failure of delivery

正確答案: A,D,E

問題2

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

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

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

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

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

正確答案: C

問題3

Wireless phones at a customer's site often experience a fast busy signal when trying to initiate calls. What two actions address this issue? (Choose two.)

A. increase cell size

B. decrease CAC Max Bandwidth

C. increase CAC Reserved Bandwidth

D. decrease cell size

E. increase CAC Max Bandwidth

正確答案: D,E

問題4

An engineer is studying the TSM for a VoWLAN user experiencing issues using a CCXv3 device. What two items will be shown? (Choose two.)

A. downlink MOS score

B. downlink packet latency

C. uplink packet latency

D. uplink MOS score

E. downlink packet loss

F. uplink packet loss

正確答案: B,E

問題5

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. This is normal operation and cannot be changed.

B. The Cisco WLC is not configured for IGMP snooping.

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

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

E. APs are not configured for IGMP snooping.

正確答案: B

問題6

An engineer notices that the batteries on a Cisco 792X series wireless phone are draining quite a bit even while not placing calls. What should be changed on the SSID to fix this?

A. set P2P to forward down-stream so that clients are not interfering with each other

B. enable U-APSD on the WLAN to save power

C. enable Multicast Direct to cut down on the multicast processing

D. set DTIM to 2 on the operational band of the voice clients

正確答案: D

問題7

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 ToS CS4.

B. Upstream marked as Best Effort.

C. Downstream marked as Best Effort.

D. Downstream marked as Silver.

E. Downstream marked as DSCP EF.

F. Upstream marked as DSCP EF.

正確答案: C,F

問題8

Refer to the exhibit.

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 4

B. Outer CAPWAP: DSCP AF41

C. Inner 802.11e: UP 3

D. Outer CAPWAP: DSCP AF31

E. Inner 802.11e: UP 5

F. Outer CAPWAP: CoS 4

正確答案: B,E

問題9

A network engineer is deploying wireless voice with a 20% overlap at -67dBm. After testing, the cell edge is determined to be 50 feet from the AP. How far away should the next AP be placed?

A. 90 feet

B. 100 feet

C. 70 feet

D. 60 feet

E. 80 feet

正確答案: A

問題10

Which two statements describe the capability of TSM to collect statistics that are related to VoWLAN on Cisco WLC v7.0? (Choose two.)

A. It is operational only on 802.11a/n radio.

B. It requires Cisco Compatible Extensions clients for uplink statistics only.

C. It requires Cisco Compatible Extensions clients for uplink and downlink statistics.

D. It is operational on both 802.11g/b/n and 802.11a/g radio.

E. The feature is enabled by default.

正確答案: B,D

問題11

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. enable Call Admission Control

B. increase QoS marking on multicast

C. enable 40 MHz wide channels

D. increase mandatory data rate

E. enable VideoStream

F. disable Multicast Messaging

正確答案: A,C,E

問題12

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?

A. show ip mcache

B. show ip igmp

C. show ip mroute

D. show ip interface counts

E. show ip route

正確答案: C

問題13

DRAG DROP

正確答案:

最新的Cisco Implementing Cisco Unified Wireless Voice Networks (IUWVN) v2.0 - 642-742免費考試真題

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