第 3 章，共 5 章14% 占考试比重

Laptops and Mobile Devices

Portable devices pack computing into compact, battery-powered designs with unique components and service considerations. This chapter covers laptop hardware, mobile connectivity, power and battery safety, and enterprise management of mobile devices.

Laptop Components

Laptops integrate compact versions of desktop parts plus display-specific hardware. Many components are replaceable modules a technician can service.

SSDs dominate modern laptops

Flash storage resists shock from movement and draws less power than spinning drives.

WLAN cards are often M.2 modules

The Wi-Fi card is frequently a replaceable or upgradeable M.2 card.

Older LCDs used an inverter

The inverter powered CCFL backlights; LED panels no longer need one.

SO-DIMM is the laptop memory form factor

Laptops use smaller SO-DIMM modules rather than full-size desktop DIMMs.

Mobile Connectivity

Phones and tablets connect through several wireless and wired technologies, each suited to a specific range and purpose.

NFC enables tap-to-pay

Near Field Communication works over a few centimeters for contactless payments.

Bluetooth pairs peripherals

It connects headsets, keyboards, and speakers over short range.

USB-C is the modern standard

The reversible connector carries charging and data on most Android devices and laptops.

USB-C can carry video and power

With Thunderbolt or DisplayPort alt mode it delivers video, data, and power over one cable.

Power and Battery Safety

Lithium-ion batteries store energy densely but require care. Recognizing failure signs and handling batteries safely prevents fire and injury.

Replace swollen batteries

A bulging lithium-ion battery is a hazard and must be replaced and recycled properly.

Never puncture or crush cells

Physical damage to lithium cells can cause fire or rupture.

Diagnose charging port faults

A loose, intermittently charging port often means a worn DC jack needing repair.

Check battery usage after updates

Settings reveal which apps drain power before assuming a hardware fault.

Mobile Security and Management

Because mobile devices leave the building, security and central management are essential in organizations.

Full-device encryption protects data at rest

A passcode-tied encryption keeps data unreadable if the device is lost.

MDM centralizes control

Mobile device management enforces policy, pushes configs, and enables remote wipe.

Use screen locks and biometrics

Passcodes, fingerprints, or face unlock prevent unauthorized access.

Enable remote locate and wipe

Lost-device features let users or IT find or erase a missing device.

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Last updated: July 2026