Cisco.Actualtests.642-742.v2014-02-10.by.Elie · What is the best practice for setting the WLC v7.0 use of WLAN QoS settings to support SIP phones on a VoWLAN? A. Configure SIP with

Cisco.Actualtests.642-742.v2014-02-10.by.Elie.100q

Number: 642-742Passing Score: 800Time Limit: 120 minFile Version: 14.5

http://www.gratisexam.com/

Exam Code: 642-742

Exam Name: CCNP Wireless - IUWVN

Exam A

QUESTION 1Which three options are benefits of U-APSD? (Choose three.)

A. synchronization of the transmission and reception of voice framesB. bandwidth reservationC. optimized power-save mode periodsD. increased call capacityE. priority bandwidth and polling

Correct Answer: ACDSection: (none)Explanation

Explanation/Reference:Explanation:

QUESTION 2Which two options allow a Cisco Unified Wireless IP Phone 7925G to conserve its battery? (Choose two.)

A. PS-PollB. S-APSDC. U-APSDD. 802.11hE. 802.11r

Correct Answer: ACSection: (none)Explanation


QUESTION 3Which statement describes the benefit of WMM U-APSD over legacy 802.11 power-save mode?

A. Client can burst data without standard interframe spacing.B. Client can burst data without ACKs.C. Client no longer sends null frame to notify of sleep mode.D. Client sleep mode is scheduled by AP to reduce jitter.

Correct Answer: ASection: (none)Explanation


QUESTION 4Which two items enable WMM to expedite frames from respective traffic categories? (Choose two.)

Consistent CWmin and CWmax values

Dynamic CWmin and CWmax values

A. AIFSB. SIFSC. PIFSD. DIFSE. U-APSDF. PS-Poll

Correct Answer: BCSection: (none)Explanation


QUESTION 5When a VoWLAN client is in the range of two cells, which two statements describe how the client makes adecision about which cell is the best to associate with? (Choose two.)


A. The client will associate with the cell with the highest RSSI value.B. The client will associate with the cell with the lowest SNR value.C. The client will associate with the cell broadcasting the highest 802.11e value.D. The client will associate with the cell broadcasting the highest TSPEC value.E. The client will associate with the cell broadcasting the lowest mandatory date rate.F. The client will associate with the cell broadcasting the highest data rate.G. The client will associate with the first cell that advertises U-APSD.

Correct Answer: ABSection: (none)Explanation


QUESTION 6The AP has been properly configured for a VoWLAN survey. The RF environment contains a noise of -87 to -90dBm. What would be the target value for the cell edge reading?

A. -55 dBmB. -60 dBmC. -62 dBmD. -67 dBmE. -70 dBmF. -73 dBm

Correct Answer: C

Section: (none)Explanation


QUESTION 7What is the recommended minimum speed at the edge of the cells in an 802.11g network for a good CiscoVoWLAN deployment?

A. 11 Mb/sB. 12 Mb/sC. 18 Mb/sD. 36 Mb/sE. 54 Mb/s

Correct Answer: BSection: (none)Explanation


QUESTION 8Which three statements are true about load-based Call Admission Control? (Choose three.)

A. grants a VoWLAN client-initiated call based on the number of active clients associated to the APB. grants a VoWLAN client-initiated call based on channel bandwidth capacityC. uses the 802.11i specificationsD. uses ADDTS action framesE. requires a WMM-enabled client

Correct Answer: BDESection: (none)Explanation


QUESTION 9Using proper VoWLAN design practice, what would be a reasonable total number of calls for a properlydesigned 802.11g cell to ensure call quality?

A. 4B. 7C. 14D. 20E. 25F. 27

Correct Answer: CSection: (none)Explanation

Explanation/Reference:

Explanation:

QUESTION 10Using proper VoWLAN design practice, what would be a reasonable total number of calls for a properlydesigned 802.11a cell to ensure call quality?

A. 4B. 7C. 14D. 20E. 25F. 27

Correct Answer: DSection: (none)Explanation


QUESTION 11A VoWLAN site survey was performed and equipment installed based on recommended design guidelines.Which two statements describe reasons to perform a post-deployment survey? (Choose two.)

A. There is insufficient information about the number of people in the area when the survey is performed.B. There is insufficient information by AirMagnet VoFi Analyzer.C. There are elevator shafts.D. There are roaming pathways.E. There are changes in temperature in the indoor environment.

Correct Answer: ADSection: (none)Explanation


QUESTION 12Which attribute does the VoWLAN Readiness Tool of WCS v7.0 use to predict acceptable conditions?

A. SNRB. RSSIC. PERD. WMME. QBSS



QUESTION 13You are deploying a combination of Cisco Unified Wireless IP Phones 7921G and 7925G at your branch offices

in a centralized call processing environment that requires high availability at branch locations. Which threecomponents need to be verified before the wireless IP phones can be deployed? (Choose three.)

A. Sufficient SRST license support at each branch locationB. Support for local voice mailC. Branch gateways support MoHD. Properly configured QoS over the IP WAN linksE. Support for single number reachF. Support for E.164 dialingG. Sufficient IP phone licenses in the Cisco Unified Communications Manager cluster

Correct Answer: ADGSection: (none)Explanation


QUESTION 14You have recently added Cisco Unified Wireless IP Phones 7921G and 7925G to your branch office. The newwireless and wired IP phones are experiencing poor call quality when receiving calls across the IP WAN fromthe remote HQ. What is the most likely issue?

A. The Cisco Unified Communications Manager bandwidth for the IP WAN link is not properly configured andis allowing more calls than the link can accommodate.

B. The Cisco Unified Communications Manager bandwidth settings have not been increased to support thenew wireless IP phones.

C. The Cisco Unified Communications Manager bandwidth is set too low, resulting in poor call quality.D. The Cisco Unified Communications Manager gatekeeper-controlled CAC has been set too low, resulting in

poor call quality.



QUESTION 15Your Cisco Unified Wireless IP Phones 7921G and 7925G are associated with the VoWLAN at your branchoffice. When they attempt to place a call, the call fails to go through and you receive a fast busy tone. What isthe issue?

A. The wireless phones failed to register with the Cisco Unified Communications Manager cluster.B. The Cisco Unified Communications Manager cluster invoked CAC to preserve IP WAN voice bandwidth.C. The local gateway rejected the call because of high IP WAN utilization.D. Automatic alternate routing has been invoked.



QUESTION 16Which two Cisco components are required to extend an existing VoWLAN to dual-mode wireless phones?(Choose two.)

A. An LDAP server for the WLANB. Cisco Unified Mobile CommunicatorC. Cisco Unified Mobility Advantage clientD. Cisco Unified Mobility AdvantageE. Cisco Unified Communications ManagerF. A RADIUS server for the WLAN

Correct Answer: BDSection: (none)Explanation


QUESTION 17A web browser is opened to a new Cisco Unified Wireless IP Phone 7921G or 7925G connected to a windowscomputer via USB. Which statement describes the ability to read and write configuration parameters to primethe phone for its first VoWLAN association and its association to a Cisco Unified Communications Manager?

A. Phones are always read-only.B. Phones are read-only and require user to be authenticated as administrator for write access.C. Phone read/write access depends on the firmware version.D. Phone depends on Cisco Unified Communications Manager configuration.



QUESTION 18Which DHCP option is used by Vocera badges to reach a Cisco Unified Communications Manager?

A. Set the option to 66.B. Set the option to 43.C. Set the option to 150.D. No option is required.



QUESTION 19When a Vocera badge performs a broadcast call in a properly configured VoWLAN using WLC v7.0, which twochoices 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: CESection: (none)Explanation


QUESTION 20When designing the coverage area for high call capacity, what two actions should you take with data rates andchannels? (Choose two.)

A. Avoid channels with high AP co-channel interference.B. Use channels with high AP co-channel interference to avoid channel roaming.C. Set the 2.4-GHz data rate of 5.5 Mb/s to required.D. Use 5-GHz channels when possible.E. Use 2.4-GHz channels when possible.



QUESTION 21Which two pieces of information from the Cisco WLC v7.0 GUI does Monitor > Clients provide about aVoWLAN client? (Choose two.)

A. RSSI at current APB. WMM stateC. current MOSD. current RF channelE. current data rate

Correct Answer: ABSection: (none)Explanation


QUESTION 22What are two benefits that result from Cisco WLC configuration of DCA for 5-GHz VoWLAN deployments?(Choose two.)

A. Avoid channels that are affected by a microwave ovenB. Manually remove channels that are not supported by VoWLAN clientsC. Avoid 802.11n 40-MHz channels

D. Avoid nearby radarE. Adjust RRM power thresholds



QUESTION 23What is the best practice for configuring data rates for an 802.11a VoWLAN deployment?

A. Configure mandatory data rates of 9 and 54 Mb/s. Disable data rates below 6 Mb/s and all other data ratesas supported.

B. Configure a mandatory data rate of 6 Mb/s. Disable data rates below 6 Mb/s and configure all other datarates as supported.

C. Configure a mandatory data rate of 54 Mb/s. Disable data rates below 36 Mb/s and configure all other datarates as supported.

D. Configure a mandatory data rate of 12 Mb/s. Disable data rates below 12 Mb/s and all other data rates assupported.



QUESTION 24What is the best practice for configuring data rates for an 802.11b VoWLAN deployment?

A. Configure mandatory data rates of 11 and 54 Mb/s. Disable data rates below 6 Mb/s and all other data ratesas supported.

B. Configure a mandatory data rate of 6 Mb/s. Disable data rates below 6 Mb/s and configure all other datarates as supported.

C. Configure a mandatory data rate of 11 Mb/s. Disable data rates below 11 Mb/s and all other data rates assupported.

D. Configure a mandatory data rate of 12 Mb/s. Disable data rates below 12 Mb/s and all other data rates assupported.



QUESTION 25What is the best practice for setting the WLC v7.0 use of WLAN QoS settings to support SIP phones on aVoWLAN?

A. Configure SIP with static CAC only with SIP call snooping.B. Configure SIP with static CAC only without SIP call snooping.C. Configure SIP with load-based CAC only with SIP call snooping.D. Configure SIP with load-based CAC only without SIP call snooping.

E. Configure SIP with load-based CAC and TSPEC only with SIP call snooping.



QUESTION 26Which three call information items does AirMagnet VoFi Analyzer provide? (Choose three.)

A. the codec used by the calling phoneB. approximate length of the call in minutesC. MOS values throughout the duration of the callD. 802.11e access category overrunsE. co-channel interference percentage during the call

Correct Answer: ABCSection: (none)Explanation


QUESTION 27Which WCS tool will be especially helpful to ensure that all VoWLAN configurations are consistent across allcontrollers?

A. Inspect VoWLAN ReadinessB. Traffic Stream MetricsC. Voice Audit ReportD. Voice DiagnosticE. Monitor Client Detail



QUESTION 28What 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 linksB. provides packet loss and latency covering the end-to-end voice path on all links and additional parameters

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

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



QUESTION 29Refer to the exhibit.

Which two statements describe information that you can derive from the WCS v7.0 output from the MonitorClient Detail? (Choose two.)

A. Comparing the RSSI and SNR can provide specific information on where the client has roamed and if thereis a problem with one or more AP configurations.

B. Comparing the information to the location of the client can provide the first hint of voice-related issues.C. If the parameters are consistently good, then voice-related issues being reported by users are probably not

related to RF parameters.D. Comparing the RSSI and SNR can provide specific information on QoS performance in the VoWLAN.E. Comparing the RSSI and SNR can provide specific information on the relative distance of the client from the

AP during a call.



QUESTION 30A downstream packet containing a DSCP value arrives at the WLC Ethernet interface from the wired sourcenetwork. The WLC is configured for QoS WLAN 802.1p mapping. How does the WLC treat the CAPWAP QoSmarking when leaving the controller interface for the respective AP and final wireless client destination?

A. No outer CAPWAP or inner QoS tagging is applied.B. No outer CAPWAP QoS tag is applied, but the original DSCP is maintained inside CAPWAP.C. The outer CAPWAP CoS is marked and capped while the inner DSCP maintains the original marking.D. The outer CAPWAP DHCP is marked and capped without any inner DSCP value.




Voice signaling traffic is being sent upstream using a WLAN configured for bronze QoS. Assume that Layer 3switches 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?

A. DSCP CS1B. CoS 1C. DSCP 46 and CoS 5D. CoS 3E. DSCP CS1 and CoS 1F. DSCP 46G. DSCP AF31H. DSCP AF31 and CoS 3

Correct Answer: ESection: (none)

Explanation



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

A. Inner 802.11e: UP 6B. Outer CAPWAP: DSCP EF and CoS 5C. Outer CAPWAP: DSCP 46 and CoS 4D. Inner 802.11e: UP 3E. Outer CAPWAP: DSCP AF31 and CoS 3F. Outer CAPWAP: DSCP AF41 and CoS 4G. Outer CAPWAP: CoS 5H. Inner 802.11e: UP 5

Correct Answer: CHSection: (none)Explanation



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

A. Inner 802.11e: UP 5B. Inner 802.11e: UP 4C. Outer CAPWAP: CoS 4D. Inner 802.11e: UP 3E. Outer CAPWAP: DSCP AF31F. Outer CAPWAP: DSCP AF41

Correct Answer: AFSection: (none)Explanation


QUESTION 34Which statement is correct for the LWAPP/CAPWAP AP upstream encapsulated frame for a WMM-associatedclient frame that is centrally switched running v5.2?

A. Wireless client WMM UP classification is translated to a wired DSCP priority.B. Wireless client 802.11p classification is translated to a wired DSCP priority.C. Wireless client WMM UP classification is translated to a wired 802.1p CoS priority.D. Wireless client 802.11p classification is translated to a wired 802.1p CoS priority.



QUESTION 35VoWLAN implementation plans for a current mix of existing Cisco Unified Wireless IP Phones 7920G and7921G to a final migration of Wireless IP Phones 7925G in a single WLAN. What would be the mostappropriate WLC WLAN configuration to end with Wireless IP Phones 7925G?

A. 7920 Client CAC = enabled only; Radio Policy = All; WMM = DisabledB. 7920 AP CAC = enabled only; Radio Policy = All; WMM = AllowedC. 7920 Client CAC = enabled only; Radio Policy = 802.11a only; WMM = DisabledD. 7920 AP CAC = enabled only; Radio Policy = 802.11a only; WMM = AllowedE. 7920 Client CAC = enabled only; Radio Policy = 802.11b/g only; WMM = DisabledF. 7920 AP CAC = enabled only; Radio Policy = 802.11b/g only; WMM = Allowed



QUESTION 36Which three WLC actions are required to properly enable queuing with TSPEC for voice traffic? (Choosethree.)

A. configure WLAN setting to enable WMMB. configure WLAN Aironet information elements to enabledC. configure global 802.11b/g or 802.11a, or both, to voice CACD. configure WLAN platinum QoSE. configure DTIM = 2

Correct Answer: ACDSection: (none)Explanation


QUESTION 37Which 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.




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.

Correct Answer: BESection: (none)Explanation



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

A. CAC values are relatively high.B. CAC values are relatively low.C. It enables QBSS, given other appropriate configurations.D. It enables TSPEC, given other appropriate configurations.E. It applies to platinum QoS.F. It applies to platinum and gold QoS.

Correct Answer: ADESection: (none)Explanation


QUESTION 40You have a VoWLAN configured for platinum QoS, WMM, and CAC. IP phones for this VoWLAN include theNokia and Cisco Unified Wireless IP Phones 7920G (pre-v2.0 firmware), 7921G, and 7925G. The Wireless IPPhones 7921G and 7925G work properly, but the Nokia and the Wireless IP Phones 7920G associate with theWLAN but cannot place calls. What is the issue?

A. The lowest mandatory speed in the WLAN is too high and needs to be reduced.B. The Cisco Unified Wireless IP Phones 7920G and Nokia IP phones do not support TSPEC.C. EDCA needs to be enabled on the WLAN.D. HCCA needs to be enabled on the WLAN.E. The reserved roaming bandwidth setting is set too low.F. The expedited bandwidth setting needs to be enabled.



QUESTION 41Which 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: CESection: (none)Explanation


QUESTION 42WLC v7.0 is configured for multicast with WLC-to-AP multicast mode, using IP address 239.10.10.10 andIGMP snooping enabled, with all other parameters set to default. What QoS value is given to multicast trafficbetween a WLC and APs?

A. CS6B. EFC. CS5D. CS4E. CS3F. CS2G. CS1H. BE

Correct Answer: HSection: (none)Explanation


QUESTION 43WLCs v7.0 have been configured for multicast and IGMP snooping enabled, with all other parameters set todefault. A wireless client actively receiving a multicast group roams from WLC1 to WLC2, both of which areconfigured 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.



QUESTION 44Which two multicast modes are valid for use with Ethernet bridging on a mesh AP? (Choose two.)

A. mesh bridge inB. regularC. bidirectional bridgeD. inE. out




QUESTION 45A WLC v7.0 is configured for multicast with WLC-to-AP multicast mode using IP address 239.10.10.10, IGMPsnooping enabled, and all other parameters set to default. Which two statements describe how a wired ingressbroadcast and multicast frame are handled? (Choose two.)

A. WLC will forward the broadcast frame to all APs and then to all WLANs.B. WLC will forward the broadcast frame to all APs and then to only WLANs with active clients.C. WLC will forward a broadcast frame to only APs and their respective WLANs with active clients.D. WLC will drop the broadcast frame.E. WLC will forward the multicast frame to all APs and then to all WLANs.F. WLC will forward the multicast frame to all APs and then to only WLANs with active clients.G. WLC will forward a multicast frame to only APs and their respective WLANs with active clients.H. WLC will drop the multicast frame.

Correct Answer: DFSection: (none)Explanation


QUESTION 46What three minimal configurations are required for a correctly scaled multicast configuration using WLC v7.0?(Choose three.)

A. Enable global multicast modeB. Enable IGMP snoopingC. Configure IGMP timeout for 60 secondsD. Configure IGMP query interval for 20 secondsE. Enable WLAN multicast VLAN featureF. Enable AP multicast mode for multicastG. Enable AP multicast mode for Unicast

Correct Answer: ABFSection: (none)Explanation


QUESTION 47A small wireless controller-based network is installed and configured inside a corporate building using Cisco2500 Series controllers and 3500 Series APs using local, monitor, and rogue detector modes. All wirelessclients have been working and now require multicast applications. WLC multicast is configured using multicastmode with IP address 239.10.10.10 and other parameters set to default. However, the wireless multicast traffichas limited success and does not work throughout the corporate building. What three actions can help resolvethe 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: CFHSection: (none)Explanation



What three items of multicast information can be interpreted from the WLC displays? (Choose three.)

A. WLC-to-AP multicast mode is configured for unicast.B. WLC-to-AP multicast mode is configured for multicast using IP address 239.1.1.1.C. The ingress WLC multicast stream is IP address 239.1.1.1.D. VideoStream is allowed for the wireless client.E. VideoStream is not allowed for the wireless client.F. IGMP snooping is enabled.G. IGMP snooping is disabled.H. QoS was configured and lowered to best effort.

Correct Answer: CEFSection: (none)Explanation



What two items of multicast information can be interpreted from the WLC display? (Choose two.)

A. WLC-to-AP multicast mode is configured for Unicast.B. WLC-to-AP multicast mode is configured for multicast.C. IGMP snooping is disabled.D. IGMP snooping is enabled.E. VideoStream is allowed for the wireless client.F. VideoStream is not allowed for the wireless client.

Correct Answer: DESection: (none)Explanation


QUESTION 50What three changes occur when you replace a legacy 802.11a/b/g Cisco AP with an 802.11a/b/g/n Cisco 3500Series AP? (Choose three.)

A. increased data rate at reduced distanceB. increased data rate at same distanceC. increased data rate at increased distanceD. benefits in 2.4 GHz onlyE. benefits in 5 GHz onlyF. benefits in both 2.4 and 5 GHz

Correct Answer: ABFSection: (none)Explanation


QUESTION 51WLC v7.0 is properly configured for 802.11n and multicast video without the optional VideoStream. Which threeof these options describe frames sent from the AP to wireless clients? (Choose three.)

A. sent as gold QoSB. sent as best effort QoSC. sent at highest mandatory rateD. sent at lowest mandatory rate

E. sent at client MCS data rateF. ACK per frameG. No ACKs

Correct Answer: BCGSection: (none)Explanation


QUESTION 52Which two applications benefit from upgrading to 802.11n? (Choose two.)

A. voiceB. videoC. database accessD. digital imagingE. SMSF. email



QUESTION 53How much overhead is added by CAPWAP encapsulation?

A. 4 BB. 14 BC. 28 BD. 44 BE. 50 BF. 60 B

Correct Answer: FSection: (none)Explanation


QUESTION 54Which four statements describe attributes of interactive video? (Choose four.)

A. Packet loss is limited to 1 percent.B. Packet loss is limited to 5 percent.C. One-way latency is limited to 150 ms.D. One-way latency is limited to a few seconds.E. Jitter is limited to 30 ms.F. Jitter has no significant requirements.

G. QoS marking is at CS4.H. QoS marking is at AF41.

Correct Answer: ACEHSection: (none)Explanation


QUESTION 55What is the minimum overhead (header plus FCS) added by 802.11 (no encryption, no WMM) between awireless client and an AP?

A. 18 BB. 24 BC. 28 BD. 35 BE. 36 BF. 48 B



QUESTION 56Which two statements best describe video conferencing? (Choose two.)

A. Video streams require maximum quality compression and decompression.B. Video streams require high-speed compression and decompression.C. H.323 codecs are commonly used.D. MPEG codecs are commonly used.



QUESTION 57In 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.



QUESTION 58VoIP 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 andvoice 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.



QUESTION 59Which of these authentication and encryption combinations would be considered the most secure?

A. LEAP and WPA TKIPB. EAP-FAST and WPA2 AESC. EAP-FAST and WPA TKIPD. WPA-PSK and TKIP



QUESTION 60What is the main difference between the Cisco Unified Wireless IP Phone 7921G and the Cisco UnifiedWireless IP Phone 7925G?

A. The 7925G supports 802.11a/b/g, whereas the 7921G supports only 802.11b/g.B. The 7925G is suited for a more rugged environment.C. The 7925G has support for 802.11n, whereas the 7921G does not.D. 7925G supports WPA2, whereas the 7921G supports only WPA1.



QUESTION 61Which one of these options best describes the ideal WLAN design for wireless VoIP clients?

A. smaller cells with all configurable speeds to ensure that all clients (802.11a/b/g) can associate to thewireless infrastructure

B. smaller cells with higher speeds and CAC-enabled prioritization of WMM clientsC. larger cells with higher speeds and WPA2 security enabled to ensure the best possible coverageD. smaller cells with APs in the inner areas using omnidirectional antennas, and APs on the outer walls using

directional antennas facing inward



QUESTION 62What happens to a wireless client when it moves from one controller to another in a different mobility domain?

A. The client will have to reauthenticate, reassociate, and get new IP address information.B. The client will have to reauthenticate and reassociate, but will be able to keep its IP address information.C. Nothing happens as long as the client roams within the same mobility group.D. It is not possible to roam to a different mobility domain.



QUESTION 63Which 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 toreauthenticate to the wireless infrastructure.

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

C. It enables the controller to send directed roam requests to a client in situations when the controller canbetter 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.



QUESTION 64Controllers 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 Pointsmode

B. mobility domain name, version of controller code, Control and Provisioning of Wireless Access Pointsmode, 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



QUESTION 65Which of these statements best describes the Cisco Compatible Extensions "AP Specified Max Power"feature?

A. The Cisco Compatible Extensions-capable client sets its power independently and confirms with the AP if itssetting is supported.

B. After a Cisco Compatible Extensions client associates to an AP, that AP will inform the other surroundingAPs what power settings that client supports in case it roams to another AP.

C. The AP automatically sets the transmit power of each of its Cisco Compatible Extensions- capable clients.D. The AP automatically sets the transmit and receive power of each of its Cisco Compatible Extensions-

capable clients.



QUESTION 66DRAG DROP

A.B.C.

D.

Correct Answer: Section: (none)Explanation


Explanation:


A.B.C.D.



Explanation:


A.B.C.D.




A.B.C.D.



Explanation:

QUESTION 70Using proper VoWLAN design practice, what would be the Cisco recommended total number of calls for aproperly designed 802.11g cell to ensure call quality?

A. 4B. 7C. 14D. 20E. 25F. 27



QUESTION 71Using proper VoWLAN design practice, what would be the Cisco recommended total number of calls for aproperly designed 802.11a cell to ensure call quality?

A. 4B. 7C. 14D. 20E. 25F. 27



QUESTION 72Which statement best describes Cisco Centralized Key Management?

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

B. It allows the wireless infrastructure to cache the credentials to eliminate the need for a full reauthenticationwhen roaming.

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

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



QUESTION 73What are the two equivalent 802.1p CoS categories that are associated with 802.11e AC_BE? (Choose two.)

A. 0B. 1C. 2D. 3E. 4F. 5



QUESTION 74Which statement best describes the ideal VoWLAN design?

A. smaller cells with all data rates enabled to ensure that all clients can associateB. smaller cells with higher data rates enabled and admission control enabled through WMMC. larger cells with higher data rates enabled and WPA2 to secure voice conversationsD. smaller cells with higher data rates enabled and no overlap to prevent co-channel interference



QUESTION 75You are getting complaints from Cisco Unified Wireless IP Phone 7925 users that their phones are failing toregister with the Cisco Unified Communications Manager Express server and are showing the message"Registering." What is the problem?

A. The IP phones are failing to receive a DHCP address from the DHCP server.B. There is no ephone configuration for each phone in the Cisco Unified CME device.C. The IP phones are failing to receive their firmware files from the TFTP server.D. The DHCP server needs to include the command option 66 ip <ip address> to serve the appropriate load

file.



QUESTION 76What is the best practice for configuring data rates for an 802.11g VoWLAN deployment?

A. Configure mandatory data rates of 12 and 54 Mb/s. Disable data rates below 6 Mb/s, and configure all otherdata rates as supported.

B. Configure a mandatory data rate of 6 Mb/s. Disable data rates below 6 Mb/s, and configure all other datarates as supported.

C. Configure a mandatory data rate of 11 Mb/s. Disable data rates below 11 Mb/s, and configure all other datarates as supported.

D. Configure a mandatory data rate of 12 Mb/s. Disable data rates below 12 Mb/s, and configure all other datarates as supported.



QUESTION 77Wireless IP phone users are complaining that during the day there are certain points in the facility where voicequality 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.



QUESTION 78A packet arrives with a decimal value of 12. Which AF class does the packet belong to, and what is the dropprobability of the packet? (Choose two.)

A. AF1B. AF2

C. AF3D. AF4E. low drop probabilityF. high drop probabilityG. medium drop probability

Correct Answer: AGSection: (none)Explanation


QUESTION 79A Cisco WLC v7.0 is configured with the default setting for wired and wireless QoS. When a wireless clientsends a voice packet to the AP, how does the AP mark the outer CAPWAP header when the packet is sent tothe Cisco WLC v7.0?

A. The AP uses the wireless priority value to create a matching 802.1p value in the CAPWAP header.B. The AP uses the wireless priority value to create a matching DSCP value in the CAPWAP header.C. The AP uses the wireless priority value to create both a matching 802.1p and DSCP value in the CAPWAP

header.D. The AP does not match the value to the CAPWAP header, which results in best effort.



QUESTION 80You are given a new single Cisco 2500 Series Wireless Controller with 8 to 12 APs. Which two statementsdescribe the minimum required multicast configuration? (Choose two.)

A. Enable Global Multicast Mode.B. Enable IGMP Snooping.C. Configure the IGMP Timeout for 60 seconds.D. Configure the IGMP Query Interval for 20 seconds.E. Enable the WLAN Multicast VLAN feature.F. Enable WLC to AP Multicast Mode for multicast.G. Enable WLC to AP Multicast Mode for unicast.

Correct Answer: AFSection: (none)Explanation


QUESTION 81IGMP snooping has been enabled on a Cisco WLC v7.0, along with any other configurations that are requiredfor wireless multicast. After a wireless client has joined a multicast group, which IP address is listed by therouter as the source reporter for that multicast group?

A. first wireless client to joinB. last wireless client to joinC. Cisco WLC AP management interface addressD. Cisco WLC management interface addressE. Cisco WLC virtual interface addressF. Cisco WLC dynamic interface address

Correct Answer: FSection: (none)Explanation


QUESTION 82You have recently enabled multicast on your WLAN. When users join the multicast sessions, you see the trafficutilization on all the APs that are controlled by the Cisco WLC v7.0 increase, which includes those APs wherethere are no multicast clients.

Which configuration parameter needs to be verified to prevent APs with no subscribed multicast clients fromreceiving 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.



QUESTION 83A Cisco WLC v7.0 is properly configured for 802.11n and multicasting video without the optional CiscoVideoStream. Which three options best describe the frames that are sent from the AP to the wireless clients?(Choose three.)

A. unicast to subscribed clientsB. multicast to subscribed clientsC. After startup, throughput is consistent.D. After startup, throughput can vary over time.E. retransmission upon failure of deliveryF. no retransmission

Correct Answer: BDFSection: (none)Explanation


QUESTION 84Which two VoWLAN configuration parameters are required to implement a Vocera Communications System ona Cisco WLC v7.0? (Choose two.)

A. Enable WLC broadcast for WLANs.B. Enable WLC multicast for WLANs.C. Disable WLAN WMM.D. Adjust the radio EDCA profile.E. Enable WLAN WMM.



QUESTION 85Which two statements describe the capability of TSM to collect statistics that are related to VoWLAN on CiscoWLC v7.0? (Choose two.)

A. The feature is enabled by default.B. It is operational only on 802.11a/n radio.C. It is operational on both 802.11g/b/n and 802.11a/g radio.D. It requires Cisco Compatible Extensions clients for uplink statistics only.E. It requires Cisco Compatible Extensions clients for uplink and downlink statistics.

Correct Answer: CDSection: (none)Explanation


QUESTION 86What 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 besuccessful.

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

C. A device that is not running a version of Cisco Compatible Extensions will show only packets that are sentand 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.



QUESTION 87What is the main difference between the Cisco Unified Wireless IP Phones 7921G and 7925G?

A. The 7925G supports 802.11a/b/g, whereas the 7921G supports only 802.11b/g.B. The 7925G is suited for a more rugged environment.C. The 7925G has support for 802.11n, whereas the 7921G does not.D. 7925G supports WPA2, whereas the 7921G supports only WPA1.



QUESTION 88You have two packets with decimal ToS values of 32 and 34. What are their results, respectively, in an IPprecedence-only device?

A. Both packets have an IP precedence tag of CS4, and the packet with the decimal value of 34 has a higherdrop probability.

B. The packet with the decimal value of 32 has an IP precedence tag of CS4, while the other decimal value of34 is ignored and treated as best effort.

C. The packet with the decimal value of 34 has an IP precedence tag of CS4, while the other decimal value of32 is ignored and treated as best effort.

D. Both packets have a decimal value that results in an IP precedence tag of CS4.



QUESTION 89What is the difference between the QoS values on the wired and wireless sides of a WLAN?

A. The wireless side of the network uses WMM, which carries voice in the Gold queue with a CoS of 7. Thewired side of the network uses CoS/DSCP values of 5 and EF.

B. The wireless side of the network uses WMM, which carries voice in the Platinum queue with a CoS of 7.The wired side of the network uses CoS/DSCP values of 5 and 40.

C. The wireless side of the network uses WMM, which carries voice in the Gold queue with a CoS of 6. Thewired side of the network uses CoS/DSCP values of 5 and EF.

D. The wireless side of the network uses WMM, which carries voice in the Platinum queue with a CoS of 6.The wired side of the network uses CoS/DSCP values of 5 and EF.



QUESTION 90A wired packet that is marked for QoS priority CS4 arrives on VLAN-4 at the Cisco WLC v7.0, with a destinationof a WLAN SSID-4. The Cisco WLC is configured for the wired and wireless QoS level of Silver. Theinfrastructure routers and switches have incorrect QoS configurations. They have mismarked the CAPWAPouter 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).



QUESTION 91A wired packet that is marked for QoS priority CS4 arrives on VLAN-4 at Cisco WLC v7.0, with a destination ofa WLAN SSID-4. The Cisco WLC is configured for the wired and wireless QoS level of Silver. The infrastructurerouters and switches have incorrect QoS configurations. They have mismarked the CAPWAP outer header to aQoS 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).



QUESTION 92Which mechanism detects if VoWLAN clients are experiencing poor signal-to-noise ratio values and causes thepower of APs to increase as needed in order to rectify signal-to-noise issues?

A. CCAB. RSSIC. 802.11hD. CHDE. QBSS



QUESTION 93A single Layer 2 multicast address can map to how many IPv4 multicast addresses?

A. 1

B. 8C. 16D. 28E. 32F. 64

Correct Answer: ESection: (none)Explanation


QUESTION 94Which two attributes can be enabled for checking by the Voice Audit Tool in Cisco WCS v7.0? (Choose two.)

A. -67 dBm cell edgeB. MOSC. TSMD. DHCPE. 25 dB SNR

Correct Answer: CDSection: (none)Explanation


QUESTION 95IGMP snooping has been enabled on a Cisco WLC v7.0, along with any other configurations that are requiredfor wireless multicast. Which statement describes an IGMP leave message to a router when IGMP snooping isenabled?

A. The message is sourced from the wireless client.B. The message is sourced from the Cisco WLC management interface.C. The message is sourced from the Cisco WLC virtual interface.D. The message is sourced from the Cisco WLC dynamic interface.E. No message is sent, and the membership is timed out.



QUESTION 96Which two statements describe a dual-mode phone, such as the Apple iPhone 4S with iOS 5.0, in relation toCisco VoWLAN? (Choose two.)

A. It contains dual 2.4-GHz and 5-GHz radio.B. It contains dual cellular and 2.4-GHz radio.C. It contains dual cellular and 5-GHz radio.

D. The default software enables voice on VoWLAN.E. It requires additional software to enable VoWLAN.

Correct Answer: BESection: (none)Explanation


QUESTION 97Which four statements describe the attributes of streaming video? (Choose four.)

A. Packet loss is limited to 1 percent.B. Packet loss is limited to 5 percent.C. One-way latency is limited to 150 ms.D. One-way latency is limited to a few seconds.E. Jitter is limited to 30 ms.F. Jitter has no significant requirements.G. QoS marking is at CS4.H. QoS marking is at AF41.

Correct Answer: BDFGSection: (none)Explanation


QUESTION 98When Vocera badges communicate from badge to badge, which voice codec is used?

A. G.723B. G.729AC. G.711D. G.729BE. the Vocera proprietary codec



QUESTION 99Which 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.D. MPEG codecs are commonly used.

Correct Answer: AD

Section: (none)Explanation



A.B.C.D.




Explanation:

Documents

Cisco.Actualtests.642-742.v2014-02-10.by.Elie · What is the best practice for setting the WLC v7.0 use of WLAN QoS settings to support SIP phones on a VoWLAN? A. Configure SIP with