Cisco : 642-742 Questions & Answers

Last Updated: Sep 29, 2026

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Cisco 642-742 Exam Syllabus Topics:

SectionObjectives
Cisco Unified Wireless Architecture- Controller-based WLAN design
- Access point and controller interaction
QoS for Wireless Voice- WMM (Wi-Fi Multimedia) and prioritization
- End-to-end QoS design
Roaming and Mobility- Layer 2 and Layer 3 roaming behavior
- Fast secure roaming (CCKM, 802.11r concepts)
Wireless Voice Fundamentals- 802.11 standards and voice considerations
- Voice over WLAN concepts
Call Admission Control (CAC)- Bandwidth management for voice sessions
- CAC mechanisms in WLAN environments
Voice Deployment and Troubleshooting- Common voice quality issues and diagnostics
- VoWLAN deployment best practices

Cisco Implementing Cisco Unified Wireless Voice Networks (IUWVN) v2.0 Sample Questions:

Question #1

Refer to the exhibit.

A customer is looking to deploy local radius authentication on their WLAN controller. After configuration has been completed, the administrator found that computers could authenticate; however, the VoIP phones could not. What is the problem given the output?

  • A. EAPOL-Key Max Retries should be set to 12 to ensure the wireless phone can authenticate.
  • B. EAPOL-Key timeout should be set to at least 20,000 Milliseconds to allow the PAC to be processed.
  • C. The EAP Broadcast Key interval is set to 1 hour however should be 8 hours.
  • D. The EAP request-timeout is too short for the wireless phone to process the PAC from the WLAN controller.
Reveal Solution  Discussion  0

Correct Answer: D  🗳️

Question #2

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?

  • A. Go into the Cisco WLC and monitor client details for WMM issues.
  • B. Perform a detailed analysis of the voice call quality from end to end.
  • C. Locate the APs in question and use the Cisco WLC to enable TSM to capture WLAN voice traffic statistics.
  • D. Ask the users to capture voice quality statistics from their wireless IP phones the next time they have issues.
Reveal Solution  Discussion  0

Correct Answer: C  🗳️

Question #3

What three minimal configurations are required for a correctly scaled multicast configuration using WLC v7.0? (Choose three.)

  • A. Enable global multicast mode
  • B. Enable IGMP snooping
  • C. Enable AP multicast mode for Unicast
  • D. Enable WLAN multicast VLAN feature
  • E. Configure IGMP timeout for 60 seconds
  • F. Enable AP multicast mode for multicast
  • G. Configure IGMP query interval for 20 seconds
Reveal Solution  Discussion  0

Correct Answer: A,B,F  🗳️

Question #4

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?

  • A. The local gateway rejected the call because of high IP WAN utilization.
  • B. The Cisco Unified Communications Manager cluster invoked CAC to preserve IP WAN voice bandwidth.
  • C. The wireless phones failed to register with the Cisco Unified Communications Manager cluster.
  • D. Automatic alternate routing has been invoked.
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

Question #5

Which two critical requirements must be addressed in the RF site survey for wireless video
surveillance? (Choose two.)

  • A. channel selection
  • B. bandwidth
  • C. jitter
  • D. packet loss
  • E. WLC configuration
Reveal Solution  Discussion  0

Correct Answer: C,D  🗳️

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