Cisco : 642-742 Questions & Answers
Updated: Sep 24, 2026
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Cisco 642-742 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Implement QoS for Voice and Video | 23% | - WMM and 802.11e QoS - DSCP and CoS marking - TSM and performance monitoring - CAC and admission control |
| Topic 2: Describe and Design Voice over Wireless Architecture | 27% | - RF design considerations for voice - VoWLAN fundamentals and requirements - Roaming and mobility protocols - 802.11 standards and voice enhancements |
| Topic 3: Implement VoWLAN Features and Security | 25% | - Power save and U-APSD - Cisco 792x IP phone deployment - Authentication and encryption for voice - WLAN configuration for voice clients |
| Topic 4: Troubleshoot VoWLAN and High-Bandwidth Applications | 10% | - Roaming and QoS troubleshooting - RF and coverage problems - Common voice issues and diagnostics |
| Topic 5: Implement Multicast over Wireless | 15% | - Multicast modes and challenges - VideoStream and multicast optimization - Multicast for voice and video |
Cisco Implementing Cisco Unified Wireless Voice Networks (IUWVN) v2.0 Sample Questions:
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 4
- B. Inner 802.11e: UP 3
- C. Inner 802.11e: UP 5
- D. Outer CAPWAP: DSCP AF41
- E. Outer CAPWAP: CoS 4
- F. Outer CAPWAP: DSCP AF31
Correct Answer: C,D 🗳️
Refer to the exhibit.
A customer is experiencing poor call performance on their 7920 wireless phones. The engineer troubleshooting the issue has opened up Cisco Spectrum Expert to try and find the problems. Given this output, what is causing the interference?
- A. Bluetooth device
- B. Xbox wireless controller
- C. cordless phone
- D. jammer
- E. microwave
- F. RFID
Correct Answer: C 🗳️
A client's VoWLAN network requires fast roaming on legacy CCXv3 certified devices, which last received an update in 2007. What two fast roaming standards and authentication methods would be supported? (Choose two.)
- A. CCKM with EAP-FAST
- B. 802.11r with EAP-FAST
- C. CCKM with EAP-TLS
- D. CCKM with PEAP
- E. 802.11r with PEAP
- F. 802.11r with EAP-TLS
- G. 802.11r with LEAP
- H. CCKM with LEAP
Correct Answer: A,H 🗳️
Which one of these options best describes the ideal WLAN design for wireless VoIP clients?
- A. larger cells with higher speeds and WPA2 security enabled to ensure the best possible coverage
- B. smaller cells with all configurable speeds to ensure that all clients (802.11a/b/g) can associate to the wireless infrastructure
- C. smaller cells with higher speeds and CAC-enabled prioritization of WMM clients
- D. smaller cells with APs in the inner areas using omnidirectional antennas, and APs on the outer walls using directional antennas facing inward
Correct Answer: C 🗳️
A customer is having issues streaming video over wireless in a few high-density areas of their campus. After further investigation, the administrator has singled out the issue pertains to the clients associated to 802.11b/g only access points. The rest of the campus is covered in 802.11n access points. What is a possible reason for the issue with video streaming on the 802.11b/g access points as opposed to the 802.11n access points?
- A. Due to the High-Density environment, there was high-utilization of the wireless spectrum. With 802.11n. the access points are able to aggregate the MSDU and MPDU frames into A-MSDU and A-MPDU frames, utilizing less airtime to transfer data.
- B. The clients could not transmit data at the highest mandatory rate of 54 Mbps due to limitations with 802.11b/g. This data-rate is only possible when transmitting at 802.11n speeds.
- C. The wireless controller was denying the client access to the video due to multicast-direct supporting the PHY rate of 48000 that the 802.11b/g client could not handle.
- D. The wireless clients were all transmitting at 802.11b data rates and would have operated properly had they been transmitting and receiving at 802.11g rates.
Correct Answer: A 🗳️
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