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Cisco 642-742 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Call Admission Control (CAC) | - CAC mechanisms in WLAN environments - Bandwidth management for voice sessions |
| QoS for Wireless Voice | - WMM (Wi-Fi Multimedia) and prioritization - End-to-end QoS design |
| Cisco Unified Wireless Architecture | - Controller-based WLAN design - Access point and controller interaction |
| Roaming and Mobility | - Layer 2 and Layer 3 roaming behavior - Fast secure roaming (CCKM, 802.11r concepts) |
| Voice Deployment and Troubleshooting | - VoWLAN deployment best practices - Common voice quality issues and diagnostics |
| Wireless Voice Fundamentals | - 802.11 standards and voice considerations - Voice over WLAN concepts |
Cisco Implementing Cisco Unified Wireless Voice Networks (IUWVN) v2.0 Sample Questions:
Refer to the exhibit.
An engineer notices VoWLAN calls getting dropped and uses Spectrum Expert to analyze the RF utilization. Based on the Spectrum Expert capture, what two options describe the interferer and how to mitigate it? (Choose two.)
- A. Radar interference
- B. Disable RRM
- C. Disable UNII-2 channels
- D. Disable DCA
- E. microwave oven interference
- F. Disable DFS
- G. DECT 6.0 Cordless phone interference
- H. Bluetooth interference
Correct Answer: A,C 🗳️
VoIP clients can be impacted by jitter. Which of these statements best describes jitter?
- A. Jitter occurs because the receiver buffer is smaller than the sender buffer, thus packets are dropped and voice quality becomes worse.
- B. Jitter can be reduced by designing cells that use only the 802.11a frequency band.
- C. A best practice to avoid jitter is to ensure that the end-to-end round-trip time does not exceed 150 ms.
- D. Jitter is defined as variation in the delay of received packets.
Correct Answer: D 🗳️
A customer has requested help in configuring priority for emergency calls. What setting needs to be enabled to allow for wireless phones to make emergency calls no matter the load on the access point?
- A. SIP CAC
- B. expedited bandwidth
- C. static CAC reservation
- D. reserved roaming bandwidth reservation
Correct Answer: B 🗳️
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 broadcasting the highest 802.11e value.
- B. The client will associate with the cell broadcasting the lowest mandatory date rate.
- C. The client will associate with the cell broadcasting the highest TSPEC value.
- D. The client will associate with the cell with the lowest SNR value.
- E. The client will associate with the first cell that advertises U-APSD.
- F. The client will associate with the cell broadcasting the highest data rate.
- G. The client will associate with the cell with the highest RSSI value.
Correct Answer: D,G 🗳️
A company is deploying multicast over wireless that needs to be in a multicast-multicast mode. The access points are not receiving multicast traffic from the wireless controller. What command would display the needed information to determine if the AP has joined the multicast group?
- A. show ip multicast routing
- B. show ip igmp groups
- C. show ip route
- D. show ip mroute
- E. show pim multicast
- F. show igmp routes
Correct Answer: B 🗳️
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