A network engineer is installing new PoE wireless APs. The first five APs deploy successfully, but the sixth one fails to start. Which of the following should the engineer investigate first?

Rationale

The engineer should investigate the power budget first.

Power over Ethernet (PoE) devices, like wireless access points (APs), require sufficient power to operate. If the sixth AP fails to start after the first five have been deployed successfully, it is likely due to exceeding the power budget available from the PoE switch or injector, which can prevent additional devices from receiving the necessary power.

A (Signal strength) YOUR ANSWER

Signal strength pertains to the quality of the wireless connection and is not a factor that would prevent an AP from starting up. Since the AP is failing to power on, signal strength is irrelevant at this stage, as there would be no wireless signal to measure if the device is not operational.

B (Duplex mismatch) YOUR ANSWER

Duplex mismatch occurs when one end of a connection is set to full duplex while the other is set to half duplex, leading to communication issues. However, this will not impact the power availability for the AP. The failure to start is unrelated to data transmission settings, making this option less pertinent than the power budget.

C (Power budget) CORRECT

The power budget is the total amount of power that the PoE switch can provide to all connected devices. If the first five APs are consuming a significant portion of this budget, the sixth AP may not receive enough power to start. Investigating the power budget is crucial to determine if the additional device can be supported.

D (CRC) YOUR ANSWER

Cyclic Redundancy Check (CRC) is a method used to detect errors in data transmission. While important for data integrity, CRC errors would not cause a device to fail to power on. Therefore, this option does not address the issue of the AP's inability to start.

Conclusion

When a PoE wireless access point fails to start after several others have been successfully deployed, the most logical first step for investigation is the power budget. Ensuring that the PoE switch can supply enough power for all connected devices is essential, as exceeding this limit can prevent additional devices from activating. Other factors, like signal strength and duplex settings, do not directly influence the initial power-up of the device.

A network engineer is installing new PoE wireless APs. The first five APs deploy successfully, but the sixth one fails to start. Which of the following should the engineer investigate first?

The engineer should investigate the power budget first.

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