Exam 200-301 topic 1 question 866 discussion

advantages of using automatic mode Answare, D Note : look at the question keywords

B:"Use the auto setting on any PoE port. The auto mode is the default setting."

When considering the advantages of using auto mode versus static mode for power allocation when an access point is connected to a Power over Ethernet (PoE) switch port, the correct answer to highlight the benefit of auto mode is: D. It detects the device is a powered device. Explanation: Auto Mode: In this mode, the PoE switch can automatically detect whether the connected device (in this case, an access point) is a powered device (PD) and negotiate the amount of power required. This dynamic detection helps ensure that only the necessary amount of power is supplied, which can be beneficial for energy efficiency and preserving available power for other devices. Static Mode: In static mode, the power level must be manually configured. The switch does not automatically detect the power requirements of the connected device, which can lead to inefficient power allocation.

In static mode, the power level is predetermined and fixed. Auto mode allows for negotiation of the power requirements based on the specific device detected. Therefore, saying that a default level is used does not accurately represent the dynamic nature of auto mode. The primary advantage of using auto mode is its ability to automatically detect whether a connected device is a powered device (PD). This detection allows the PoE switch to negotiate the power requirements with the device, ensuring that power is only supplied when a compatible device is present. This leads to more efficient use of power and minimizes the risk of damaging non-PoE devices.

while the default level can be a benefit of auto mode in some cases, detecting the PD and adapting to its power needs through negotiation offer a more significant advantage for most deployments. It ensures compatibility, optimizes power usage, and simplifies management compared to static mode

B is correct

D is correct

The main difference between auto mode and static mode for power allocation when an access point is connected to a PoE switch port is as follows: Auto Mode: In auto mode, the switch enables powered-device detection. If enough power is available, it automatically allocates power to the PoE port after device detection. This is the default setting, allowing for plug-and-play operation without the need for further configuration 5 . Static Mode: In static mode, the switch pre-allocates power to the port, even when no powered device is connected. This mode does not involve device detection and may not be as efficient as auto mode in utilizing available power 2 . Therefore, the advantage of using auto mode versus static mode is that it enables efficient power allocation by detecting the powered device and automatically allocating power to the PoE port, using all four pairs of the cable if available

A is incorrect because power policing is by default disabled on all POE ports B is the correct answer D is incorrect because both auto and static modes enable power-device detection Refer to page 6/10 https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9200/software/release/16-10/configuration_guide/int_hw/b_1610_int_and_hw_9200_cg/configuring_poe.pdf

Both, "auto" and "static" modes enable powered-device detection. So, D is not an advantage for "auto" mode.

The switch supports these PoE modes: auto – The switch automatically detects if the connected device requires power. If the switch discovers a powered device connected to the port and if the switch has enough power, it grants power, updates the power budget, turns on power to the port on a first-come, first-served basis, and updates the LEDs… static – The switch pre-allocates power to the port (even when no powered device is connected) and guarantees that power will be available for the port. Reference: https://www.cisco.com/en/US/docs/switches/lan/catalyst3850/software/release/3.2_0_se/multibook/configuration_guide/b_consolidated_config_guide_3850_chapter_011010.html

chat gpt: D. It detects the device is a powered device. When you use auto mode for power allocation in a Power over Ethernet (PoE) switch port, the switch automatically detects the connected device and allocates the appropriate amount of power required for that device. This is known as "autonegotiation" or "auto-detection." This feature has the advantage of ensuring that the connected device receives the exact amount of power it needs, preventing over- or under-powering. In contrast, static mode would require you to manually configure the power settings for the port, which can be less efficient and might not provide the optimal power allocation for the specific device connected to the port. Option D highlights the advantage of auto mode in terms of automatically detecting the device as a powered device and allocating power accordingly.

I will go with D. If the switch detects the powered device then only it turns the power on whereas in static mode the power is always available irrespective of the type of devices connected to it.

its B for me

I'd say answer D auto—The switch automatically detects if the connected device requires power. If the switch discovers a powered device connected to the port and if the switch has enough power, it grants power, updates the power budget, turns on power to the port on a first-come, first-served basis, and updates the LEDs.

Answer D is wrong because only the mode "NEVER disables powered device detection and never powers the PoE port" (according to the link). Both in static mode and in Auto they detect if the device is a powered device, but static also ensures power load to the port when there are many PoE devices, which is the advantage of static mode (high priority interface). Both Static and Auto if you do not specify the maximum power, the device will pre-allocate the maximum value. Now the advantage of "Auto" mode would be that it is enabled by default on all ports, meeting the plug-and-play requirement. I belive correct Answer letra B! https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9400/software/release/16-11/configuration_guide/int_hw/b_1611_int_and_hw_9400_cg/configuring_poe.html#:~:text=the%20default%20configuration-,(auto%20mode)%20works%20well%2C%20providing%20plug%2Dand%2Dplay%20operation.,-No%20further%20configuration

It is B.