642-742 Guide

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2021 Jan 642-742 dump:

Q1. 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? 

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. 

Answer:


Q2. Refer to the exhibit. 

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

A. Inner 802.11e: UP 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: CH 


Q3. You 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 three components need to be verified before the wireless IP phones can be deployed? (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: ADG 


Q4. 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:


Q5. 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: ABC 


Leading pass4sure 642-742:

Q6. 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.) 

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. 

Answer: AD 


Q7. 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. 

Answer:


Q8. 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. 

Answer:


Q9. 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. 

Answer: CE 


Q10. Refer to the exhibit. 

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. 

Answer: CEF 


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