Which PoE mode enables powered-devices detection and guarantees power when the device detected?
Which PoE mode enables powered-devices detection and guarantees power when the device detected?
The PoE mode that enables powered-devices detection and guarantees power when the device is detected is 'static.' In static mode, the switch pre-allocates (reserves) power for a port before the switch discovers the powered device. This power reservation ensures that the power will be provided upon device detection, guaranteeing that the powered device receives the necessary power.
auto - Enables powered-device detection; if enough power is available, automatically allocates power to the PoE port after device detection (default setting). max max-wattage - limits the power allowed on the port; if no value is specified, the maximum is allowed. max max-wattage - limits the power allowed on the port; range is 4000 to 30000 mW; if no value is specified, the maximum is allowed. never - disables device detection, and disable power to the port. Note: If a port has a Cisco powered device connected to it, do not use the power inline never command to configure the port. A false link-up can occur, placing the port into the error-disabled state. static - Enables powered-device detection; pre-allocate (reserve) power for a port before the switch discovers the powered device; the switch reserves power for this port even when no device is connected and guarantees that power will be provided upon device detection. The switch allocates power to a port configured in static mode before it allocates power to a port configured in auto mode.
Answer B is correct. Not A https://www.thinlabs.com/faq/configure-cisco-switch-for-powering-poe-client#:~:text=static%20%2D%20Enables%20powered%2Ddevice%20detection,be%20provided%20upon%20device%20detection.
Judging based on the link you provided, the answer is A. lol
It is static, key word is "guarantees"
The question said: guarantees power when the device detected? It is answer B - Static Go to index - Power Management Modes. Then, at the end of the Static description, it said: Use the static setting on a high-priority interface. Source: 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#con_1874624
The switch allocates power to a port configured in static mode before it allocates power to a port configured in auto mode. This means if we have limited power and 2 devices we connect to the switch at the same time with one port set to auto mode and the other set to static, The static port will guarantee power since it's served first but the auto port wouldn't if we ran out of power. So, I think it's static. https://www.thinlabs.com/faq/configure-cisco-switch-for-powering-poe-client#:~:text=static%20%2D%20Enables%20powered%2Ddevice%20detection,be%20provided%20upon%20device%20detection.
But the question says about power detection. Why do we have to not select the mode with power detection and create a scenario that lacks what is required in the question? Anything am i missing here. why Q. Which PoE mode enables powered-devices detection and guarantees power when the device detected?
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#:~:text=static%E2%80%94Enables%20powered%2Ddevice%20detection.%20Pre%2Dallocate%20(reserve)%20power%20for%20a%20port%20before%20the%20switch%20discovers%20the%20powered%20device.%20The%20switch%20reserves%20power%20for%20this%20port%20even%20when%20no%20device%20is%20connected%20and%20guarantees%20that%20power%20will%20be%20provided%20upon%20device%20detection.
Answer is A because its written that "enables devices" and detection. Static will always provide power even is the device is plugged or not. Auto detects the poe enabled devices and send power.
It is static
B. static
static
Static not auto
Copy the question and paste it on google search. The answer is auto. The first link is Cisco's answer.
I initially picked A without hesitation. The definition is so closely similar on Cisco's site. But, after further reading, I noticed Cisco (and perhaps other brands as well) prefers "static" and prioritizes it over a port that is configured w/ "auto". This seems to be a pattern with other networking concepts as well like in EtherChannel/LAG, where you stay away from "auto" if possible. Although, I don't think we ever configured any of our switches at work w/ "static". I can see how this might actually pose some issues at work though. New techs might mistake a client's equipment as broken from shipment if this ever happened in shared colocations where multiple clients/servers are on the same switch and the newly arrive equipment does not lit up after connecting a cable to a switch port. Anyhow, good reading I suppose.
See in google search, the cisco site explain....Correct answer is A (Auto)
More B than A
it´s B, the Keyword is "guarantees" The switch allocates power to a port configured in static mode before it allocates power to a port configured in auto mode (the default one).
keyword is "detection" a static powered POE will always give power regardless if a POE device is plugged in or not therefore it is not doing "detection" specifically with POE. Auto will provide a stable connection, it will detect the POE and give the amount of power needed for it to function.
auto : The device automatically detects if the connected device requires power. If the device discovers a powered device connected to the port and if the device 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. For LED information, see the hardware installation guide. static : The device pre-allocates power to the port (even when no powered device is connected) and guarantees that power will be available for the port. The device allocates the port configured maximum wattage, and the amount is never adjusted through the IEEE class or by CDP messages from the powered device. Because power is pre-allocated, any powered device that uses less than or equal to the maximum wattage is guaranteed to be powered when it is connected to the static port. The port no longer participates in the first-come, first-served model.