642-742 - CCNP Wireless - IUWVN
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What is the best practice for configuring data rates for an 802.11g VoWLAN deployment?
Configure a mandatory data rate of 12 Mb/s. Disable data rates below 12 Mb/s, and configure all other data rates as supported.
Which DHCP option is used by Vocera badges to reach a Cisco Unified Communications Manager?
No option is required.
Which of these statements best describes Cisco Centralized Key Management?
It allows the wireless infrastructure to cache the credentials, thus eliminating the need to conduct a full reauthentication when roaming.
Which statement best describes Cisco Centralized Key Management?
It allows the wireless infrastructure to cache the credentials to eliminate the need for a full reauthentication when roaming.
Which two pieces of information from the Cisco WLC v7.0 GUI does Monitor > Clients provide about a VoWLAN client? (Choose two.)
RSSI at current AP
What is the best practice for setting the WLC v7.0 use of WLAN QoS settings to support SIP phones on a VoWLAN?
Configure SIP with static CAC only with SIP call snooping.
Which two attributes can be enabled for checking by the Voice Audit Tool in Cisco WCS v7.0? (Choose two.)
Wireless IP phone users are complaining that during the day there are certain points in the facility where voice quality is poor. How should you troubleshoot this issue?
Locate the APs in question and use the Cisco WLC to enable TSM to capture WLAN voice traffic statistics.
Which three options are benefits of U-APSD? (Choose three.)
synchronization of the transmission and reception of voice frames
optimized power-save mode periods
increased call capacity
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?
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.
Which statement is correct for the LWAPP/CAPWAP AP upstream encapsulated frame for a WMM- associated client frame that is centrally switched running v5.2?
Wireless client WMM UP classification is translated to a wired DSCP priority.
Which three statements are true about load-based Call Admission Control? (Choose three.)
grants a VoWLAN client-initiated call based on channel bandwidth capacity
uses ADDTS action frames
requires a WMM-enabled client
A Cisco 7925 phone at a client's location is not registering with CUCM. The engineer analyzes a packet capture, sees that the phone receives an IP, and downloads the proper configuration file from TFTP successfully. What type of messages should the phone be sending at this point?
When designing the coverage area for high call capacity, what two actions should you take with data rates and channels? (Choose two.)
Avoid channels with high AP co-channel interference.
Use 5-GHz channels when possible.
Which two statements are correct if IGMP snooping is enabled on a Cisco WLC v7.0? (Choose two.)
The IGMP packets from the wireless clients are received at the Cisco WLC, which generates a query for the client.
The router IGMP table is updated with the IP address of the Cisco WLC as the last reporter.
Which two options allow a Cisco Unified Wireless IP Phone 7925G to conserve its battery? (Choose two.)
Controllers in a mobility group must all have which of these characteristics in common?
mobility group name, version of controller code, Control and Provisioning of Wireless Access Points mode, ACLs, and WLANs (SSIDs)
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.)
increase CAC Max Bandwidth
decrease cell size
Which WCS tool will be especially helpful to ensure that all VoWLAN configurations are consistent across all controllers?
Voice Audit Report
What happens to a wireless client when it moves from one controller to another in a different mobility domain?
The client will have to reauthenticate, reassociate, and get new IP address information.
When Vocera badges communicate from badge to badge, which voice codec is used?
the Vocera proprietary codec
Which of these authentication and encryption combinations would be considered the most secure?
EAP-FAST and WPA2 AES
Which three call information items does AirMagnet VoFi Analyzer provide? (Choose three.)
the codec used by the calling phone
approximate length of the call in minutes
MOS values throughout the duration of the call
WLCs v7.0 have been configured for multicast and IGMP snooping enabled, with all other parameters set to default. A wireless client actively receiving a multicast group roams from WLC1 to WLC2, both of which are configured for the client IP subnet. Which statement describes the roaming process?
There is no required action from the client and WLC2 becomes the local anchor controller.
A wired packet that is marked for QoS priority CS4 arrives on VLAN-4 at Cisco WLC v7.0, with a destination of a WLAN SSID-4. The Cisco WLC is configured for the wired and wireless QoS level of Silver. The infrastructure routers and switches have incorrect QoS configurations. They have mismarked the CAPWAP outer header to a QoS priority EF. Which statement is true about how the packet is sent from the AP to the final WMM wireless client?
The AP sends the packet with an 802.11 priority tag of 3 (Silver).
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?
The outer CAPWAP CoS is marked and capped while the inner DSCP maintains the original marking.
What is the difference between the QoS values on the wired and wireless sides of a WLAN?
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.
A network engineer is troubleshooting a VoWLAN deployment with VoFi Analyzer and sees a WiMOS score of 2.9. How would the tool describe this value?
Which two statements correctly describe WLAN QoS configuration related to WMM? (Choose two.)
7920 Client CAC mode is not compatible with WMM policy and cannot be used at the same time.
7920 AP CAC and 7920 client CAC modes are for 802.11b/g/n only.
In order to place a call, what is the first step that a wireless phone must do?
Associate with the wireless infrastructure.
Which statement describes the benefit of WMM U-APSD over legacy 802.11 power-save mode?
Client can burst data without standard interframe spacing.
What is the recommended minimum speed at the edge of the cells in an 802.11g network for a good Cisco VoWLAN deployment?
Which mechanism detects if VoWLAN clients are experiencing poor signal-to-noise ratio values and causes the power of APs to increase as needed in order to rectify signal-to-noise issues?
Which one of these options best describes the ideal WLAN design for wireless VoIP clients?
smaller cells with higher speeds and CAC-enabled prioritization of WMM clients
You have two packets with decimal ToS values of 32 and 34. What are their results, respectively, in an IP precedence-only device?
Both packets have a decimal value that results in an IP precedence tag of CS4.
When reviewing a design for a voice over wireless deployment, what per-call bandwidth cost should be factored in when determining maximum calls per cell using SIP and G.711u as the codec?
What are two benefits that result from Cisco WLC configuration of DCA for 5-GHz VoWLAN deployments? (Choose two.)
Manually remove channels that are not supported by VoWLAN clients
Avoid nearby radar
A customer is deploying a few remote sites and has decided to use FlexConnect mode for the wireless access points. The customer needs to have seamless roaming for the voice clients at these sites. What two configurations need to be implemented to guarantee roaming? (Choose two)
What is the main difference between the Cisco Unified Wireless IP Phones 7921G and 7925G?
The 7925G is suited for a more rugged environment.
Which two statements best describe video conferencing? (Choose two.)
Video streams require high-speed compression and decompression.
H.323 codecs are commonly used.
A wireless customer has called with a problem regarding voice calls. When a person is put on hold, there is silence and the music on hold does not come across. What is a requirement of music on hold?
Multicast routing should be configured at least to the wireless controller and client dynamic interfaces.
Which two statements describe the capability of TSM to collect statistics that are related to VoWLAN on Cisco WLC v7.0? (Choose two.)
It is operational on both 802.11g/b/n and 802.11a/g radio.
It requires Cisco Compatible Extensions clients for uplink statistics only.
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?
The Cisco WLC is not configured for IGMP snooping.
Your Cisco Unified Wireless IP Phones 7921G and 7925G are associated with the VoWLAN at your branch office. When they attempt to place a call, the call fails to go through and you receive a fast busy tone. What is the issue?
The Cisco Unified Communications Manager cluster invoked CAC to preserve IP WAN voice bandwidth.
Which statement best describes the ideal VoWLAN design?
smaller cells with higher data rates enabled and admission control enabled through WMM
Assuming 30% total overhead and no other clients on an AP, how many single stream 802.11n 2.4GHz IP cameras that output a 6 Mbps video feed could one 802.11n AP support?
What is the best practice for configuring data rates for an 802.11b VoWLAN deployment?
Configure a mandatory data rate of 11 Mb/s. Disable data rates below 11 Mb/s and all other data rates as supported.
A Cisco WLC v7.0 is configured with the default setting for wired and wireless QoS. When a wireless client sends a voice packet to the AP, how does the AP mark the outer CAPWAP header when the packet is sent to the Cisco WLC v7.0?
The AP does not match the value to the CAPWAP header, which results in best effort.
A 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.)
There is insufficient information about the number of people in the area when the survey is performed.
There are roaming pathways.
A customer using a 7925 phone reports that sometimes the music on hold does not come through or is choppy. The engineer checks the location history and notices it tends to occur toward the edge of the cell. The APs have their data rates set to 12Mbps as mandatory where all rates below are disabled. What is the cause of this issue?
mandatory data rates set too high