Exam 300-425 topic 1 question 57 discussion

Answer cannot be C, as the signal strength has a positive value. Answer is D as shown in official cert guide, page 106. 'When you need an AP deployment that supports voice and video, your goal should be to design for wireless coverage and call capacity. AP cells should be overlapped by about 20 percent to streamline client roaming and handoff from one AP to another. Any delay or interruption will be very noticeable to users on an active call, so devices should be able to find candidate APs well ahead of time as the users move around. As the previous sections recommended, the RSSI of each AP should be −67 dBm or higher at the boundary of its cell, and the SNR should be 25 dB or greater. When you perform an active site survey to validate the network’s performance, packet loss or the packet error rate (PER) should be no greater than about 1 percent.'

"To ensure acceptable voice quality, the device should always have a signal of −67 dBm or higher when using 5GHz or 2.4GHz, while the device meets the access point’s receiver sensitivity required signal level for the transmitted data rate. A minimum SNR of 25 dB (−92 dBm noise level with −67 dBm signal level) should be maintained." ...taken from chapter 5 of offical cert guide.

D is the correct answer, since we should meet Voice design. then we need 20% cell overlap and 25db SNR and minimum -67dbm signal and 1% packet loss. if the case data-only design we can have 10% packet loss.

Answer: D

According to Cisco ENWLSD Course, it is D.

Answer cannot be C, as the signal strength has a positive value.

Answer: D

D is correct