Exam 200-301 topic 1 question 128 discussion

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.

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9400/software/release/16-9/configuration_guide/int_hw/b_169_int_and_hw_9400_cg/configuring_poe.html

Would go for B, Auto and Static detect the device, only Static guarantees the power delivery.

A. auto Explanation: Auto Mode: In Power over Ethernet (PoE), auto mode allows for the detection of powered devices (PDs) connected to the PoE switch or injector. When a device is detected, the PoE switch negotiates and guarantees the appropriate amount of power for that device. This mode ensures that power is supplied only to devices that require it and are capable of using it, helping to prevent power wastage and potential overloads.

According to this: 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 Answer is AUTO Configures the PoE mode on the port. The keywords have these meanings: auto—Enables powered-device detection. If enough power is available, automatically allocates power to the PoE port after device detection. This is the default setting. 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.

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 device preallocates power to the port (even when no powered device is connected) and guarantees that power will be available for the port. https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9400/software/release/17-11/configuration_guide/int_hw/b_1711_int_and_hw_9400_cg/configuring_poe.html#:~:text=Cisco%20Universal%20Power%20Over%20Ethernet%20(Cisco%20UPOE)%20is%20a%20Cisco,%2C7%2C8)%20with%20the

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

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´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).

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

It is static