A+ 实操题（PBQ）：题型与练习方法

Try three questions. Understand every answer.

Original English practice examples, with answers and explanations available here. No account required. These are independent teaching examples, not official exam questions or exam dumps.

Question 1 of 3 · Mobile devices and computer hardware

A laptop charges normally with its original USB-C adapter. On a compatible dock, data and video work, but the battery drains under load. The dock delivers less power than the laptop requires. Which change addresses the evidence with the least disruption?

Use a supported dock or power arrangement with sufficient delivered wattageReplace the battery before checking negotiated powerRoll back the dock graphics driver despite stable videoReduce the display refresh rate without checking the power requirement

Answer and explanation

Best answer: Use a supported dock or power arrangement with sufficient delivered wattage

The measured power shortfall explains discharge under load even though data and video work. Use a supported arrangement that meets the laptop power requirement.

Why the other choices fit less well

Battery replacement is premature when the measured charging input is insufficient. Stable video does not indicate a graphics-driver fault; reducing refresh rate without checking the required and delivered wattage does not establish a supported charging arrangement.

USB-IF: power delivery

Question 2 of 3 · Operational procedures

A user asks you to reset a slow laptop. Their only copy of an important folder is on its internal drive. What should you do before starting a potentially destructive reset?

Start the reset and recover files afterwardBack up the required files and verify that the backup can be readRename the folder to protect itAssume cloud sync includes every local folder

Answer and explanation

Best answer: Back up the required files and verify that the backup can be read

Preserve the required data and verify the backup before a destructive operation. Confirm the destination and that the files open; an unverified backup is an assumption.

Why the other choices fit less well

A reset can remove data before recovery is possible. A renamed folder remains on the same drive. Cloud sync must be checked rather than presumed to cover local files.

Microsoft: reset your PC

Question 3 of 3 · Network troubleshooting

A workstation can reach a service by IP address, but a lookup of its hostname against the configured DNS server fails. Other users can resolve the name. Which check best follows this evidence?

Replace the workstation display cableReinstall the service on the remote serverInspect the workstation DNS-server configuration and test that resolverReplace the switch because all connectivity has failed

Answer and explanation

Best answer: Inspect the workstation DNS-server configuration and test that resolver

The successful IP connection narrows the investigation. Check which resolver this workstation uses and query it directly before making a wider change.

Why the other choices fit less well

Display cabling does not resolve hostnames. A working service for other users does not justify reinstalling it. Successful IP communication contradicts the claim that all connectivity has failed.

Microsoft: nslookup

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A+ 的基于表现题目：是什么，如何练习

为什么会有这些题目

Try three questions. Understand every answer.

Why the other choices fit less well

Why the other choices fit less well

Why the other choices fit less well

Choose your next step

我们如何练习它们

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