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2021 Jan 642-742 study guide:

Q21. Refer to the exhibit. 

Voice signaling traffic is being sent upstream using a WLAN configured for bronze QoS. Assume that 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 at location 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 


Q22. 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 associate to 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 possible coverage 

D. smaller cells with APs in the inner areas using omnidirectional antennas, and APs on the outer walls using directional antennas facing inward 

Answer: B 


Q23. Which WCS tool will be especially helpful to ensure that all VoWLAN configurations are consistent across all controllers? 

A. Inspect VoWLAN Readiness 

B. Traffic Stream Metrics 

C. Voice Audit Report 

D. Voice Diagnostic 

E. Monitor Client Detail 

Answer: C 


Q24. Refer to the exhibit. 

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: BE 


Q25. Which of these authentication and encryption combinations would be considered the most secure? 

A. LEAP and WPA TKIP 

B. EAP-FAST and WPA2 AES 

C. EAP-FAST and WPA TKIP 

D. WPA-PSK and TKIP 

Answer: B 


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Q26. A WLC v7.0 is configured for multicast with WLC-to-AP multicast mode using IP address 239.10.10.10, IGMP snooping enabled, and all other parameters set to default. Which two statements describe how a wired ingress broadcast 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. 

Answer: DF 


Q27. 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 

Answer: BD 


Q28. When designing the coverage area for high call capacity, what two actions should you take with data 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: AD 


Q29. Which 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. 

Answer: BC 


Q30. When a VoWLAN client is in the range of two cells, which two statements describe how the client makes 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: AB