Hardware and Operating Systems
What this domain tests
Identification of internal and external hardware, ports and cables, storage devices, and the functions of an operating system, including the boot sequence and file management.
Core concepts
- Motherboard hosts the CPU socket, RAM slots, expansion slots (PCIe) and chipsets; SMPS supplies power.
- Ports: USB, HDMI, VGA, Ethernet (RJ-45), audio jack. Know which device uses which.
- Storage: HDD (magnetic platters, moving head) vs SSD (flash, no moving parts, faster, quieter).
- OS functions: process management, memory management, file management, device management, security and user interface.
- Boot sequence: power on → POST (power-on self-test) → BIOS/UEFI locates the boot device → bootloader loads the OS kernel.
- Interface types: GUI (windows, icons, menus, pointer) vs CLI (typed commands).
- File names carry an extension that tells the OS which application opens them: .docx, .xlsx, .pptx, .pdf, .txt, .jpg, .exe.
Worked example
A user reports the machine beeps and shows nothing on screen, but the fans spin. Reasoning: power reaches the board, so the supply is probably fine; a beep code during POST points to faulty or unseated RAM. Reseat or swap the RAM module, then re-test. Replacing the monitor first would be guessing, not diagnosis.
Traps that cost marks
- Saying formatting deletes the partition - formatting prepares a partition for use; deleting the partition removes the volume itself.
- Confusing a driver (software that lets the OS talk to a device) with the device itself.
- Claiming an SSD has platters.
- Mixing up POST and bootloader in the start-up order.