300-415 · Question #111
What is an advantage of using auto mode versus static mode of power allocation when an access point is connected or a PoE switch port?
The correct answer is D. The default level is used for the access point. Auto mode in PoE allows a switch to dynamically negotiate and allocate the appropriate power level to a connected access point, often defaulting to a standard power class if specific requirements are not advertised, which simplifies deployment and avoids manual configuration…
Question
Options
- AIt detects the device is a powered device
- BAll four pairs of the cable are used
- CPower policing is enabled at the same time
- DThe default level is used for the access point
How the community answered
(49 responses)- B2% (1)
- C4% (2)
- D94% (46)
Why each option
Auto mode in PoE allows a switch to dynamically negotiate and allocate the appropriate power level to a connected access point, often defaulting to a standard power class if specific requirements are not advertised, which simplifies deployment and avoids manual configuration errors.
The detection of a powered device is a fundamental step of PoE that occurs regardless of whether auto or static power allocation mode is configured.
The use of all four cable pairs for power delivery is a characteristic of specific higher power PoE standards (e.g., PoE+ or 4PPoE), not an exclusive advantage of the auto power allocation mode.
Power policing, while a feature of some PoE switches for budgeting, is not inherently enabled by or an exclusive advantage of auto mode; auto mode primarily focuses on dynamic power allocation based on negotiation.
In auto mode, the switch dynamically negotiates the required power with the access point. If the access point does not explicitly advertise a power class, the switch will allocate a default PoE power level, ensuring the AP powers on without requiring manual power configuration.
Concept tested: PoE auto vs. static power allocation
Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750x_cg/swpoe.html
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