Question 55

Investigate the power budget first.

The network engineer should first investigate the power budget, as the failure of the sixth PoE wireless AP to start may indicate that the total power available to the devices has been exceeded.

A) Signal strength

While signal strength is important for the operation of wireless APs, it is not the primary concern in this scenario since the fifth AP has deployed successfully. Signal strength issues would typically manifest after a device has powered on, making it less relevant to the immediate problem of the sixth AP failing to start.

B) Duplex mismatch

Duplex mismatch refers to a communication issue between devices that can affect data transmission speeds and quality, but it does not prevent a device from powering on. Since the problem is related to the AP not starting, duplex mismatch is not the first issue to investigate.

C) Power budget

The power budget is crucial in this scenario as Power over Ethernet (PoE) has a limit on the total wattage that can be supplied to connected devices. If the first five APs are consuming too much power, the sixth one may not receive enough power to operate, which makes this the most relevant aspect to investigate first.

D) CRC

Cyclic Redundancy Check (CRC) is used for error-checking in data transmission. While CRC errors can indicate problems with communication after a device is powered on, they do not directly relate to the issue of the sixth AP failing to start, making this option less relevant for initial troubleshooting.

Conclusion

Investigating the power budget is the most logical first step because the failure of the sixth AP to start is likely due to insufficient power supply, particularly if the previous five APs are already drawing from the same power source. Other options, such as signal strength, duplex mismatch, and CRC, do not address the immediate issue of power availability, which is critical in a PoE setup.