ccnp wireless iuwvn (642-742) certification prep

CCNP Wireless – IUWVN (642-742)

Certification Prep

Certified WAN Professional (CWP) Hands-On Lab Guide

7545 Irvine Center Drive Suite 200 Irvine, CA 92618 www.lanwanprofessional.com

QUESTION NO: 1 Which three options are benefits of U-APSD? (Choose three.) A. synchronization of the transmission and reception of voice frames B. bandwidth reservation C. optimized power-save mode periods D. increased call capacity E. priority bandwidth and polling

Answer: A,C,D

Explanation:

QUESTION NO: 2 Which two options allow a Cisco Unified Wireless IP Phone 7925G to conserve its battery?(Choose two.) A. PS-Poll B. S-APSD C. U-APSD D. 802.11h E. 802.11r

Answer: A,C

Explanation:

QUESTION NO: 3 Which 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.

Answer: A

Explanation:

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QUESTION NO: 4 Which two items enable WMM to expedite frames from respective traffic categories? (Choosetwo.) Consistent CWmin and CWmax values Dynamic CWmin and CWmax values A. AIFS B. SIFS C. PIFS D. DIFS E. U-APSD F. PS-Poll

Answer: B,C

Explanation:

QUESTION NO: 5 When a VoWLAN client is in the range of two cells, which two statements describe how the clientmakes a decision 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.

Answer: A,B

Explanation:

QUESTION NO: 6 The AP has been properly configured for a VoWLAN survey. The RF environment contains anoise of -87 to -90 dBm. What would be the target value for the cell edge reading?

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A. -55 dBm B. -60 dBm C. -62 dBm D. -67 dBm E. -70 dBm F. -73 dBm

Answer: C

Explanation:

QUESTION NO: 7 What is the recommended minimum speed at the edge of the cells in an 802.11g network for agood Cisco VoWLAN deployment? A. 11 Mb/s B. 12 Mb/s C. 18 Mb/s D. 36 Mb/s E. 54 Mb/s

Answer: B

Explanation:

QUESTION NO: 8 Which 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 theAP B. grants a VoWLAN client-initiated call based on channel bandwidth capacity C. uses the 802.11i specifications D. uses ADDTS action frames E. requires a WMM-enabled client

Answer: B,D,E

Explanation:

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QUESTION NO: 9 Using proper VoWLAN design practice, what would be a reasonable total number of calls for aproperly designed 802.11g cell to ensure call quality? A. 4 B. 7 C. 14 D. 20 E. 25 F. 27

Answer: C

Explanation:

QUESTION NO: 10 Using proper VoWLAN design practice, what would be a reasonable total number of calls for aproperly designed 802.11a cell to ensure call quality? A. 4 B. 7 C. 14 D. 20 E. 25 F. 27

Answer: D

Explanation:

QUESTION NO: 11 A VoWLAN site survey was performed and equipment installed based on recommended designguidelines. 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 isperformed. B. There is insufficient information by AirMagnet VoFi Analyzer. C. There are elevator shafts. D. There are roaming pathways.

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E. There are changes in temperature in the indoor environment.

Answer: A,D

Explanation:

QUESTION NO: 12 Which attribute does the VoWLAN Readiness Tool of WCS v7.0 use to predict acceptableconditions? A. SNR B. RSSI C. PER D. WMM E. QBSS

Answer: B

Explanation:

QUESTION NO: 13 You are deploying a combination of Cisco Unified Wireless IP Phones 7921G and 7925G at yourbranch offices in a centralized call processing environment that requires high availability at branchlocations. Which three components need to be verified before the wireless IP phones can bedeployed? (Choose three.) A. Sufficient SRST license support at each branch location B. Support for local voice mail C. Branch gateways support MoH D. Properly configured QoS over the IP WAN links E. Support for single number reach F. Support for E.164 dialing G. Sufficient IP phone licenses in the Cisco Unified Communications Manager cluster

Answer: A,D,G

Explanation:

QUESTION NO: 14

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You have recently added Cisco Unified Wireless IP Phones 7921G and 7925G to your branchoffice. The new wireless and wired IP phones are experiencing poor call quality when receivingcalls across the IP WAN from the remote HQ. What is the most likely issue? A. The Cisco Unified Communications Manager bandwidth for the IP WAN link is not properlyconfigured and is allowing more calls than the link can accommodate. B. The Cisco Unified Communications Manager bandwidth settings have not been increased tosupport the new wireless IP phones. C. The Cisco Unified Communications Manager bandwidth is set too low, resulting in poor callquality. D. The Cisco Unified Communications Manager gatekeeper-controlled CAC has been set too low,resulting in poor call quality.

Answer: A

Explanation:

QUESTION NO: 15 Your Cisco Unified Wireless IP Phones 7921G and 7925G are associated with the VoWLAN atyour branch office. When they attempt to place a call, the call fails to go through and you receive afast busy tone. What is the 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 voicebandwidth. C. The local gateway rejected the call because of high IP WAN utilization. D. Automatic alternate routing has been invoked.

Answer: B

Explanation:

QUESTION NO: 16 Which two Cisco components are required to extend an existing VoWLAN to dual-mode wirelessphones? (Choose two.) A. An LDAP server for the WLAN B. Cisco Unified Mobile Communicator C. Cisco Unified Mobility Advantage client D. Cisco Unified Mobility Advantage

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E. Cisco Unified Communications Manager F. A RADIUS server for the WLAN

Answer: B,D

Explanation:

QUESTION NO: 17 A web browser is opened to a new Cisco Unified Wireless IP Phone 7921G or 7925G connectedto a windows computer via USB. Which statement describes the ability to read and writeconfiguration parameters to prime the phone for its first VoWLAN association and its association toa 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.

Answer: C

Explanation:

QUESTION NO: 18 Which DHCP option is used by Vocera badges to reach a Cisco Unified CommunicationsManager? A. Set the option to 66. B. Set the option to 43. C. Set the option to 150. D. No option is required.

Answer: D

Explanation:

QUESTION NO: 19 When a Vocera badge performs a broadcast call in a properly configured VoWLAN using WLCv7.0, which two choices indicate how the QoS is marked? (Choose two.)

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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.

Answer: C,E

Explanation:

QUESTION NO: 20 When designing the coverage area for high call capacity, what two actions should you take withdata rates and channels? (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.

Answer: A,D

Explanation:

QUESTION NO: 21 Which two pieces of information from the Cisco WLC v7.0 GUI does Monitor > Clients provideabout a VoWLAN client? (Choose two.) A. RSSI at current AP B. WMM state C. current MOS D. current RF channel E. current data rate

Answer: A,B

Explanation:

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QUESTION NO: 22 What are two benefits that result from Cisco WLC configuration of DCA for 5-GHz VoWLANdeployments? (Choose two.) A. Avoid channels that are affected by a microwave oven B. Manually remove channels that are not supported by VoWLAN clients C. Avoid 802.11n 40-MHz channels D. Avoid nearby radar E. Adjust RRM power thresholds

Answer: B,D

Explanation:

QUESTION NO: 23 What 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 allother data rates as supported. B. Configure a mandatory data rate of 6 Mb/s. Disable data rates below 6 Mb/s and configure allother data rates as supported. C. Configure a mandatory data rate of 54 Mb/s. Disable data rates below 36 Mb/s and configure allother data rates as supported. D. Configure a mandatory data rate of 12 Mb/s. Disable data rates below 12 Mb/s and all otherdata rates as supported.

Answer: D

Explanation:

QUESTION NO: 24 What 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 allother data rates as supported. B. Configure a mandatory data rate of 6 Mb/s. Disable data rates below 6 Mb/s and configure allother data rates as supported. C. Configure a mandatory data rate of 11 Mb/s. Disable data rates below 11 Mb/s and all otherdata rates as supported. D. Configure a mandatory data rate of 12 Mb/s. Disable data rates below 12 Mb/s and all other

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data rates as supported.

Answer: C

Explanation:

QUESTION NO: 25 What is the best practice for setting the WLC v7.0 use of WLAN QoS settings to support SIPphones on a VoWLAN? 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.

Answer: A

Explanation:

QUESTION NO: 26 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: A,B,C

Explanation:

QUESTION NO: 27 Which WCS tool will be especially helpful to ensure that all VoWLAN configurations are consistentacross all controllers? A. Inspect VoWLAN Readiness

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B. Traffic Stream Metrics C. Voice Audit Report D. Voice Diagnostic E. Monitor Client Detail

Answer: C

Explanation:

QUESTION NO: 28 What 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 links B. provides packet loss and latency covering the end-to-end voice path on all links and additionalparameters on the VoWLAN segment C. provides packet loss covering the end-to-end voice path on all links and additional parameterson VoWLAN segment D. provides packet loss, latency, and additional parameters on VoWLAN call segment

Answer: D

Explanation:

QUESTION NO: 29 Refer to the exhibit.

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Which two statements describe information that you can derive from the WCS v7.0 output from theMonitor Client Detail? (Choose two.) A. Comparing the RSSI and SNR can provide specific information on where the client has roamedand if there is 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-relatedissues. C. If the parameters are consistently good, then voice-related issues being reported by users areprobably not related to RF parameters. D. Comparing the RSSI and SNR can provide specific information on QoS performance in theVoWLAN. E. Comparing the RSSI and SNR can provide specific information on the relative distance of theclient from the AP during a call.

Answer: B,C

Explanation:

QUESTION NO: 30 A downstream packet containing a DSCP value arrives at the WLC Ethernet interface from thewired source network. The WLC is configured for QoS WLAN 802.1p mapping. How does the

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WLC treat the CAPWAP QoS marking when leaving the controller interface for the respective APand 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 originalmarking. D. The outer CAPWAP DHCP is marked and capped without any inner DSCP value.

Answer: C

Explanation:


Voice signaling traffic is being sent upstream using a WLAN configured for bronze QoS. Assumethat 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 atlocation 1? 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

Answer: E

Explanation:

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Voice bearer traffic is being sent downstream using a WLAN configured for gold QoS. Which twoof these options indicate the inner 802.11e QoS markings and QoS CAPWAP markings that areused at location 1? (Choose two.) A. Inner 802.11e: UP 6 B. Outer CAPWAP: DSCP EF and CoS 5 C. Outer CAPWAP: DSCP 46 and CoS 4 D. Inner 802.11e: UP 3 E. Outer CAPWAP: DSCP AF31 and CoS 3 F. Outer CAPWAP: DSCP AF41 and CoS 4 G. Outer CAPWAP: CoS 5 H. Inner 802.11e: UP 5

Answer: C,H

Explanation:


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Voice-bearer traffic is being sent downstream using a WLAN configured for gold QoS. Which twoof these options indicate the inner 802.11e QoS markings and QoS CAPWAP markings that areused 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: A,F

Explanation:

QUESTION NO: 34 Which statement is correct for the LWAPP/CAPWAP AP upstream encapsulated frame for aWMM-associated client 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.

Answer: A

Explanation:

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QUESTION NO: 35 VoWLAN implementation plans for a current mix of existing Cisco Unified Wireless IP Phones7920G and 7921G to a final migration of Wireless IP Phones 7925G in a single WLAN. Whatwould 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

Explanation:

QUESTION NO: 36 Which three WLC actions are required to properly enable queuing with TSPEC for voice traffic?(Choose three.) A. configure WLAN setting to enable WMM B. configure WLAN Aironet information elements to enabled C. configure global 802.11b/g or 802.11a, or both, to voice CAC D. configure WLAN platinum QoS E. configure DTIM = 2

Answer: A,C,D

Explanation:

QUESTION NO: 37 Which two statements correctly describe WLAN QoS configuration related to WMM? (Choosetwo.) 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 sametime. 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.

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Answer: B,C

Explanation:


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: B,E

Explanation:


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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.

Answer: A,D,E

Explanation:

QUESTION NO: 40 You have a VoWLAN configured for platinum QoS, WMM, and CAC. IP phones for this VoWLANinclude the Nokia and Cisco Unified Wireless IP Phones 7920G (pre-v2.0 firmware), 7921G, and7925G. The Wireless IP Phones 7921G and 7925G work properly, but the Nokia and the WirelessIP Phones 7920G associate with the WLAN 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.

Answer: B

Explanation:

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QUESTION NO: 41 Which two statements are correct if IGMP snooping is enabled on a Cisco WLC v7.0? (Choosetwo.) 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 aquery for the client. D. The IGMP packets from the wireless clients are received at the WLC and are used to updatethe 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.

Answer: C,E

Explanation:

QUESTION NO: 42 WLC v7.0 is configured for multicast with WLC-to-AP multicast mode, using IP address239.10.10.10 and IGMP snooping enabled, with all other parameters set to default. What QoSvalue is given to multicast traffic between a WLC and APs? A. CS6 B. EF C. CS5 D. CS4 E. CS3 F. CS2 G. CS1 H. BE

Answer: H

Explanation:

QUESTION NO: 43 WLCs v7.0 have been configured for multicast and IGMP snooping enabled, with all otherparameters set to default. A wireless client actively receiving a multicast group roams from WLC1

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to WLC2, both of which are configured for the client IP subnet. Which statement describes theroaming 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 WLC1becomes anchor controller. D. A new IGMP packet is required from the client and WLC2 becomes foreign controller andWLC1 becomes anchor controller.

Answer: A

Explanation:

QUESTION NO: 44 Which two multicast modes are valid for use with Ethernet bridging on a mesh AP? (Choose two.) A. mesh bridge in B. regular C. bidirectional bridge D. in E. out

Answer: B,D

Explanation:

QUESTION NO: 45 A WLC v7.0 is configured for multicast with WLC-to-AP multicast mode using IP address239.10.10.10, IGMP snooping enabled, and all other parameters set to default. Which twostatements describe how a wired ingress broadcast and multicast frame are handled? (Choosetwo.) 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.

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H. WLC will drop the multicast frame.

Answer: D,F

Explanation:

QUESTION NO: 46 What three minimal configurations are required for a correctly scaled multicast configuration usingWLC v7.0? (Choose three.) A. Enable global multicast mode B. Enable IGMP snooping C. Configure IGMP timeout for 60 seconds D. Configure IGMP query interval for 20 seconds E. Enable WLAN multicast VLAN feature F. Enable AP multicast mode for multicast G. Enable AP multicast mode for Unicast

Answer: A,B,F

Explanation:

QUESTION NO: 47 A small wireless controller-based network is installed and configured inside a corporate buildingusing Cisco 2500 Series controllers and 3500 Series APs using local, monitor, and rogue detectormodes. All wireless clients have been working and now require multicast applications. WLCmulticast is configured using multicast mode with IP address 239.10.10.10 and other parametersset to default. However, the wireless multicast traffic has limited success and does not workthroughout the corporate building. What three actions can help resolve the problems? (Choosethree.) A. Enable WLC IGMP snooping. B. Change WLC from multicast mode to Unicast mode in case of wired multicast infrastructureissues. 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.

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Answer: C,F,H

Explanation:


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

Answer: C,E,F

Explanation:

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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.

Answer: D,E

Explanation:

QUESTION NO: 50 What three changes occur when you replace a legacy 802.11a/b/g Cisco AP with an 802.11a/b/g/nCisco 3500 Series AP? (Choose three.) A. increased data rate at reduced distance B. increased data rate at same distance C. increased data rate at increased distance D. benefits in 2.4 GHz only E. benefits in 5 GHz only F. benefits in both 2.4 and 5 GHz

Answer: A,B,F

Explanation:

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QUESTION NO: 51 WLC v7.0 is properly configured for 802.11n and multicast video without the optionalVideoStream. Which three of these options describe frames sent from the AP to wireless clients?(Choose three.) A. sent as gold QoS B. sent as best effort QoS C. sent at highest mandatory rate D. sent at lowest mandatory rate E. sent at client MCS data rate F. ACK per frame G. No ACKs

Answer: B,C,G

Explanation:

QUESTION NO: 52 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: B,D

Explanation:

QUESTION NO: 53 How much overhead is added by CAPWAP encapsulation? A. 4 B B. 14 B C. 28 B D. 44 B E. 50 B F. 60 B

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Answer: F

Explanation:

QUESTION NO: 54 Which 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.

Answer: A,C,E,H

Explanation:

QUESTION NO: 55 What is the minimum overhead (header plus FCS) added by 802.11 (no encryption, no WMM)between a wireless client and an AP? A. 18 B B. 24 B C. 28 B D. 35 B E. 36 B F. 48 B

Answer: C

Explanation:

QUESTION NO: 56 Which two statements best describe video conferencing? (Choose two.)

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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.

Answer: B,C

Explanation:

QUESTION NO: 57 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.

Answer: A

Explanation:

QUESTION NO: 58 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 aredropped 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 exceed150 ms.

Answer: B

Explanation:

QUESTION NO: 59 Which of these authentication and encryption combinations would be considered the most secure?

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A. LEAP and WPA TKIP B. EAP-FAST and WPA2 AES C. EAP-FAST and WPA TKIP D. WPA-PSK and TKIP

Answer: B

Explanation:

QUESTION NO: 60 What 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.

Answer: B

Explanation:

QUESTION NO: 61 Which 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 associateto the wireless infrastructure B. smaller cells with higher speeds and CAC-enabled prioritization of WMM clients C. larger cells with higher speeds and WPA2 security enabled to ensure the best possiblecoverage D. smaller cells with APs in the inner areas using omnidirectional antennas, and APs on the outerwalls using directional antennas facing inward

Answer: B

Explanation:

QUESTION NO: 62 What happens to a wireless client when it moves from one controller to another in a differentmobility domain?

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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 addressinformation. 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.

Answer: A

Explanation:

QUESTION NO: 63 Which 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 notneed to reauthenticate to the wireless infrastructure. B. It allows the wireless infrastructure to cache the credentials, thus eliminating the need toconduct a full reauthentication when roaming. C. It enables the controller to send directed roam requests to a client in situations when thecontroller can better service the client on a different AP than the one to which the client isassociated. D. By caching their credentials, it helps clients save scanning time when looking for a new AP tojoin.

Answer: B

Explanation:

QUESTION NO: 64 Controllers 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 WirelessAccess Points mode B. mobility domain name, version of controller code, Control and Provisioning of Wireless AccessPoints mode, ACLs, and WLANs (SSIDs) C. mobility group name, version of controller code, Control and Provisioning of Wireless AccessPoints mode, ACLs, and WLANs (SSIDs) D. mobility domain name, version of controller code, and Control and Provisioning of WirelessAccess Points mode

Answer: C

Explanation:

Cisco 642-742 Exam


QUESTION NO: 65 Which of these statements best describes the Cisco Compatible Extensions "AP Specified MaxPower" feature? A. The Cisco Compatible Extensions-capable client sets its power independently and confirmswith the AP if its setting is supported. B. After a Cisco Compatible Extensions client associates to an AP, that AP will inform the othersurrounding APs 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 CompatibleExtensions-capable clients.

Answer: C

Explanation:

QUESTION NO: 66 DRAG DROP

Answer:

Cisco 642-742 Exam


Explanation:


Answer:

Cisco 642-742 Exam


Explanation:


Cisco 642-742 Exam


Answer:

Explanation:

Cisco 642-742 Exam


ccnp wireless iuwvn (642-742) certification prep

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