220-1201 Concept Map (Mind Map): Domain 1, Mobile Devices

Every topic from Domain 1 of the exam on one page, with the pairs the exam swaps to trick you. It's about 13% of your score.

1.1 Monitor mobile device hardware and replace parts

What sits inside a laptop or phone, and how to swap it safely

Before you open the case

Manufacturer service manual: The maker's step-by-step guide for a given model: the order of disassembly, screw types and locations, and the exact replacement part numbers.
ESD protection: Electrostatic discharge (ESD) is the small static shock that can kill a chip without you feeling it. A wrist strap and an antistatic mat keep you and the device at the same charge.
Replaceable part vs soldered part: A replaceable part (field-replaceable unit) can be swapped with tools. A soldered part (often RAM, sometimes storage on thin laptops) is fixed to the motherboard and can only be changed by replacing the whole board.

Power and typing

Lithium-ion battery: The rechargeable battery of laptops, tablets and phones. On many recent devices it is internal, screwed or glued in, and not meant to be removed by the user.
Battery health: How much charge the battery still holds compared with when it was new, and how many charge cycles it has done. Phones and laptops can report it, for example in a battery report.
Laptop keyboard and keys: Single keycaps clip back on. A failed keyboard is replaced as a unit through a ribbon cable, and on some laptops it is fixed to the top cover so the whole palm rest assembly is replaced.

Memory and storage

SODIMM (laptop RAM): Small Outline Dual In-line Memory Module: the short memory stick used in laptops and small PCs, usually under a cover on the bottom.
Soldered RAM: Memory chips fixed directly on the motherboard, common in thin laptops and tablets. The amount bought on day one is the amount for life.
2.5-inch HDD: A hard disk drive with spinning platters in the laptop size. Cheaper per gigabyte, but slower, heavier on power and sensitive to drops.
2.5-inch SATA SSD: A solid-state drive in the same size and with the same SATA connector as a laptop hard drive: the easy upgrade for an older laptop.
M.2 SSD: A small circuit-board SSD that screws flat onto the motherboard. An M.2 drive can talk SATA or the much faster NVMe, and its size is in its name (2280 = 22 mm wide, 80 mm long).
mSATA SSD: An older small SSD card from before M.2, limited to SATA speed. Found in laptops from the early 2010s.

Radios, camera and microphone

Wireless card: The small card, usually M.2 today, that provides Wi-Fi and often Bluetooth. Replacing it can add a newer Wi-Fi standard.
Wi-Fi antenna connector and placement: Thin cables run from the wireless card up into the display lid, where the antennas sit high for better reception. They clip onto the card with tiny snap-on connectors.
Cellular (WWAN) card: A wireless wide area network card: a cellular modem inside a laptop, with a SIM or eSIM, so it connects to the internet without Wi-Fi.
Built-in camera (webcam): The camera in the top of the display bezel, wired through the hinge to the motherboard.
Built-in microphone: Small microphones, usually next to the webcam in the display bezel, sometimes near the keyboard.

Privacy and security components

Biometrics: Unlocking with a body feature instead of a password: a fingerprint reader on the power button or palm rest, or face recognition with an infrared camera.
Near-field scanner (NFC reader): A built-in reader that detects a badge, smart card or phone held a few centimeters away, used for sign-in or payments.
Webcam privacy shutter: A small sliding cover or a hardware switch that physically blocks or disconnects the camera.
Privacy screen filter: A film or built-in display mode that narrows the viewing angle, so only the person in front can read the screen.

1.2 Accessories and connectivity options

Cables, short-range radios and the gear that turns a laptop into a desk setup

Cable connectors

USB (Type-A): The classic flat rectangular USB plug, on chargers, computers and flash drives. It only fits one way.
USB-C: The small oval, reversible connector that carries data, charging (USB Power Delivery) and even video, on most current laptops and phones.
microUSB: A thin, one-way USB plug found on older Android phones, cheap accessories and battery packs.
miniUSB: An older, thicker small USB plug used on older cameras, GPS units and game controllers.
Lightning: Apple's small reversible connector for older iPhones and accessories. iPhone 15 and later models switched to USB-C.

Short-range wireless links

Near-field communication (NFC): A radio link that works only over a few centimeters: tap to pay, tap to pair, read a badge.
Bluetooth: A short-range wireless link for accessories (headsets, keyboards, mice, speakers, cars), forming a personal area network around one person.
Tethering: Sharing a phone's cellular data connection with another device, typically one laptop over a USB cable or Bluetooth.
Mobile hotspot: The phone (or a dedicated device) creates its own Wi-Fi network and shares its cellular data with several nearby devices.

Turning a laptop into a desk setup

Docking station: A base the laptop connects to, often by one USB-C or Thunderbolt cable, that adds monitors, network, extra USB ports and charging, sometimes with its own power supply.
Port replicator: A simpler base that duplicates the laptop's existing ports, so cables stay plugged in at the desk.

Input and audio accessories

Trackpad (touchpad): The flat touch surface below a laptop keyboard that moves the pointer, with gestures like two-finger scrolling.
Track point (pointing stick): A small rubber nub in the middle of some laptop keyboards that moves the pointer when pushed.
Drawing pad (graphics tablet): An external pad used with a pen for drawing or signing, mapping the pen position to the screen.
Stylus: A pen for touch screens. A passive stylus just imitates a fingertip. An active stylus has electronics for pressure and palm rejection and may need charging or pairing.
Headset: Headphones with a microphone, connected by USB, 3.5 mm jack or Bluetooth, for calls and meetings.
External speakers: Speakers connected by cable or Bluetooth when the built-in ones are too weak.
External webcam: A USB camera clipped on a monitor, used when the laptop is closed on a dock or when better image quality is needed.

1.3 Configure mobile connectivity and support apps

Cellular, Bluetooth, location, company management and synchronization

Cellular and Wi-Fi data

Cellular data (enable or disable): The switch that lets the phone use the mobile network for internet. Turned off, apps only work on Wi-Fi.
Airplane mode: One switch that turns off all radios (cellular, Wi-Fi, Bluetooth). Wi-Fi and Bluetooth can then be turned back on one by one.
4G (LTE): The mobile data generation most devices still fall back to, with broad coverage.
5G: The current mobile generation: higher speeds and lower delay than 4G. Its fastest high-band signal (millimeter wave) reaches only short distances.
3G: An older mobile data generation, now largely switched off by carriers.
Wi-Fi on a mobile device: Connecting the phone or tablet to a wireless network, which saves cellular data and is usually faster indoors.
SIM card: Subscriber Identity Module: the small removable card that identifies the subscriber to the carrier.
eSIM: An embedded SIM chip soldered into the device. The carrier profile is downloaded (often by scanning a QR code), and several profiles can be stored.

Pairing a Bluetooth device

Enable Bluetooth: Turn Bluetooth on in the phone or computer settings.
Enable pairing: Put the accessory into pairing (discoverable) mode, often by holding a button until a light blinks.
Find a device for pairing: Scan from the phone or computer and pick the accessory from the list.
Enter the PIN code: Type or confirm the personal identification number (PIN) shown, often 0000 or 1234 for simple accessories, to complete pairing.
Test connectivity: Make a call, play audio or type to confirm the accessory works after pairing.

Location services

Global positioning system (GPS): The phone computes its position from satellite signals. Accurate outdoors, works without cell service, but needs a view of the sky and uses battery.
Cellular location services: The position is estimated from nearby cell towers, so it works indoors and saves battery but is only approximate.
Location permission per app: Each app asks whether it may use location always, only while open, or never; the user or the company policy decides.

Managing company devices

Mobile device management (MDM): A central service that enrolls phones and tablets, pushes settings (Wi-Fi, email, VPN), installs apps, enforces rules and can lock or wipe a lost device.
Mobile application management (MAM): Not named in the objectives, but the usual answer for personal phones: IT manages only the company apps and their data, not the whole device.
Corporate-owned device: A phone or tablet bought by the company. IT can fully configure, restrict and wipe it.
Bring your own device (BYOD): Employees use their personal phones for work, usually after enrolling them and accepting the company's rules.
Policy enforcement: Rules the management service applies automatically: screen lock and passcode, encryption, OS version, allowed apps, disabled camera.
Corporate applications: The work apps IT pushes to managed devices, often from a company app catalog, kept separate from personal apps.

Synchronization

Mobile device synchronization: Keeping mail, calendar, contacts and files identical between the phone, the computer and the cloud account.
Recognizing data caps: A cellular plan may limit how much data is used each month. Large syncs (photos, backups, files) should be set to Wi-Fi only.
Calendar and contacts: Personal information synced from an account (company mail server or cloud account) so meetings and phone numbers follow the user.
Mail on a mobile device: Adding the user's mail account so messages sync. Company mail often uses Exchange ActiveSync (Microsoft's protocol that also syncs calendar and contacts).
Cloud storage: An online drive that syncs files between the phone and other devices, so work files are reachable anywhere.
Business applications: Work apps (collaboration, CRM, expense tools) that keep their own data in sync with company servers.

Part of the CompTIA A+ Core 1 (220-1201) Study Kit: Concept Maps, Flashcards and practice questions. Also free: the Domain 1 flashcards. New to the exam? Read the 220-1201 study guide.