PrepKing Number: 642-742 Passing Score: 800 Time Limit: 120 min File Version: 61.0 http://www.gratisexam.com/ CISCO 642-742 EXAM QUESTIONS & ANSWERS Exam Name: CCNP Wireless - IUWVN
Certkey QUESTION 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 Correct Answer: ACD QUESTION 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 Correct Answer: AC QUESTION 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. Correct Answer: A QUESTION 4 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 Correct Answer: C QUESTION 5 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 the AP 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 Correct Answer: BDE QUESTION 6 Using proper VoWLAN design practice, what would be a reasonable total number of calls for a properly designed 802.11g cell to ensure call quality? http://www.gratisexam.com/ A. 4 B. 7 C. 14 D. 20 E. 25 F. 27 Correct Answer: C
QUESTION 7 Which attribute does the VoWLAN Readiness Tool of WCS v7.0 use to predict acceptable conditions? A. SNR B. RSSI C. PER D. WMM E. QBSS Correct Answer: B QUESTION 8 You have recently added Cisco Unified Wireless IP Phones 7921G and 7925G to your branch office. The new wireless and wired IP phones are experiencing poor call quality when receiving calls 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 properly configured and is allowing more calls than the link can accommodate. B. The Cisco Unified Communications Manager bandwidth settings have not been increased to support the new 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. Correct Answer: A QUESTION 9 Which two Cisco components are required to extend an existing VoWLAN to dual-mode wireless phones? (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 E. Cisco Unified Communications Manager F. A RADIUS server for the WLAN Correct Answer: BD QUESTION 10 A web browser is opened to a new Cisco Unified Wireless IP Phone 7921G or 7925G connected to a windows computer via USB. Which statement describes the ability to read and write configuration parameters to prime the 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. Correct Answer: C QUESTION 11 Which 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. Correct Answer: D QUESTION 12 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 13 What 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 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 Correct Answer: BD QUESTION 14 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 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. Correct Answer: A QUESTION 15 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 additional parameters on the VoWLAN segment C. provides packet loss covering the end-to-end voice path on all links and additional parameters on VoWLAN segment
D. provides packet loss, latency, and additional parameters on VoWLAN call segment Correct Answer: D QUESTION 16 Which two statements describe information that you can derive from the WCS v7.0 output from the Monitor Client Detail? (Choose two.) A. Comparing the RSSI and SNR can provide specific information on where the client has roamed and 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-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. Correct Answer: BC QUESTION 17 A downstream packet containing a DSCP value arrives at the WLC Ethernet interface from the wired source network. The WLC is configured for QoS WLAN 802.1p mapping. How does the WLC treat the CAPWAP QoS marking 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. Correct Answer: C QUESTION 18
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 Correct Answer: AF QUESTION 19 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 Correct Answer: B
QUESTION 20 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 Correct Answer: ACD QUESTION 21 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: BE QUESTION 22 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: ADE QUESTION 23 You have a VoWLAN configured for platinum QoS, WMM, and CAC. IP phones for this VoWLAN include the Nokia and Cisco Unified Wireless IP Phones 7920G (pre-v2.0 firmware), 7921G, and 7925G. The Wireless IP Phones 7921G and 7925G work properly, but the Nokia and the Wireless IP 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. Correct Answer: B QUESTION 24 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 25
WLC v7.0 is configured for multicast with WLC-to-AP multicast mode, using IP address 239.10.10.10 and IGMP snooping enabled, with all other parameters set to default. What QoS value 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 Correct Answer: H QUESTION 26 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 Correct Answer: BD QUESTION 27 A small wireless controller-based network is installed and configured inside a corporate building using Cisco 2500 Series controllers and 3500 Series APs using local, monitor, and rogue detector modes. All wireless clients have been working and now require multicast applications. WLC multicast is configured using multicast mode with IP address 239.10.10.10 and other parameters set to default. However, the wireless multicast traffic has limited success and does not work throughout the corporate building. What three actions can help resolve the 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: CFH QUESTION 28 WLC v7.0 is properly configured for 802.11n and multicast video without the optional VideoStream. 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 Correct Answer: BCG QUESTION 29 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 Correct Answer: F QUESTION 30
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. Correct Answer: ACEH QUESTION 31 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. Correct Answer: B QUESTION 32 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. Correct Answer: B
QUESTION 33 What 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. Correct Answer: A QUESTION 34 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 Wireless Access Points mode B. mobility domain name, version of controller code, Control and Provisioning of Wireless Access Points mode, 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 Correct Answer: C http://www.gratisexam.com/