300-360 · Question #26
300-360 Question #26: Real Exam Question with Answer & Explanation
The correct answer is A: The phones are experiencing excessive co-channel interference.. Two separate issues combine to cause connectivity problems. First (A), statically setting all APs to power level 1 (maximum transmit power) on the same 2.4 GHz channel causes excessive co-channel interference - neighboring APs on the same channel overpower each other, degrading t
Question
Options
- AThe phones are experiencing excessive co-channel interference.
- BThe phones only operate on the 2.4 GHz band when the power level is above 25 mW.
- CThe phones are not transmitting at the same power levels as the access points.
- DThe phones are experiencing delays of less than 30 ms within their coverage cell.
- EThe phones are receiving greater than -67 dBm RSSI on the 2.4 GHz band.
Explanation
Two separate issues combine to cause connectivity problems. First (A), statically setting all APs to power level 1 (maximum transmit power) on the same 2.4 GHz channel causes excessive co-channel interference - neighboring APs on the same channel overpower each other, degrading the RF environment. Second (C), there is a transmit power asymmetry: APs transmit at high power (level 1) while the Cisco 7925G phone is a low-power handheld device with a much weaker radio. The AP can hear the phone, but the phone may not be heard by the AP, and the phone may also roam poorly because it hears too many strong APs. This 'power mismatch' disrupts the bidirectional link. Options B and D describe non-issues or non-existent limitations, and option E (RSSI above -67 dBm) would actually indicate a strong signal, not a problem.
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