CompTIA Exam Prep - ITF+, A+, Network+, Security+, CySA+

Every CompTIA Tech+ (FC0-U71) candidate eventually has to answer a deceptively simple question: what operating system should be used for a given job, and why? The exam's Applications and Software domain expects you to recognize the major operating system families, know their typical use cases, and understand how a user interacts with each one. This guide walks through Windows, macOS, Linux, Chrome OS, and the mobile platforms (Android and iOS/iPadOS), then ties it together with the GUI-vs-CLI distinction and the file systems each OS relies on. What Is an Operating System, and Why Does Tech+ Test It? An operating system (OS) is the software layer that manages a device's hardware and provides the environment in which applications run. It schedules the CPU, allocates memory, manages storage through a file system, and provides the interface — graphical or text-based — that a user or administrator interacts with. Tech+ treats OS literacy as foundational because nearly every later...

Remote Disc lets a Mac without an optical drive use the CD or DVD drive in another computer over the local network. Apple introduced it when the MacBook Air shipped without a drive, and it remains in macOS. On the A+ exam it is a named macOS feature, and the more useful knowledge is what it cannot do — because that is where the support calls come from. How it works On the machine with the drive, sharing is enabled in Sharing preferences — DVD or CD Sharing on a Mac, or a small Apple-supplied utility on Windows. The client Mac then shows Remote Disc in the Finder sidebar under Locations, and an inserted disc appears there as though it were local. Both machines must be on the same local network. Discovery uses Bonjour, Apple's zero-configuration service discovery over multicast DNS, which means it works without any configuration on a flat network and stops working the moment the two machines are on different subnets. An option exists to prompt the sharing machine's user b...

Mission Control is the macOS feature that shows every open window, every full-screen application, and every desktop space on one screen. On the A+ exam it appears in the macOS features objective alongside Spotlight, Time Machine, Keychain, and FileVault, and the questions are usually about what a named feature does rather than how to configure it. What Mission Control shows Activating it zooms out to a bird's-eye view of the current desktop. Open windows spread out so none is hidden behind another, grouped by application. Along the top sits a bar containing every desktop space and every full-screen application, and clicking any of them switches to it. The activation methods matter because support calls often start with someone triggering it by accident. A four-finger swipe upward on a trackpad, a three-finger swipe upward if the gesture setting was changed, the Control and Up Arrow keys, the F3 key on Apple keyboards, and a hot corner if one is configured all do the same thing....

The video above runs through shortcuts for minimizing and maximizing windows, but it moves past the exact key combinations quickly and never mentions two features that trip people up constantly: Snap Layouts, and the title-bar shake that Windows 11 quietly turns off by default. This guide fills in the rest — every shortcut on its own, how snapping works for halves, quarters, and full Snap Layouts, why Aero Shake behaves differently depending on which version of Windows you're running, and how to move a window to a second monitor without touching the mouse. The Core Shortcuts: Minimize, Maximize, Restore Four shortcuts cover almost everything: Win+Down — minimizes the active window, or restores it if it's already maximized. Press it twice from a maximized window and it minimizes. Win+Up — maximizes the active window. Win+M — minimizes every open window at once. Win+Shift+M — restores whatever Win+M just minimized, in the order it minimized the...

The video above shows tasklist and taskkill ending a stuck app, but it never shows the actual syntax, what the flags do, or the one thing you should never try to force-kill. This guide fills in the commands themselves: how to find the exact process you're targeting, the difference between a polite request and a forced termination, how to take out an entire process tree at once, and why some processes refuse to die no matter what you throw at them. Finding the Process First: tasklist Before you can end anything, you need to know exactly what you're targeting. Open an elevated Command Prompt and run: tasklist That lists every running process with four columns that matter: Image Name (the executable), PID (its unique process ID), Session Name , and Mem Usage . The PID matters more than the name — if an app is open in three windows, you'll see three entries with the same image name but three different PIDs, and only one of them is the window that's actually frozen....

The video above shows the Game Bar recording a window, but it never names the tool, the shortcuts, or the one limitation that trips up almost everyone who tries this for the first time. This guide fills in the rest: what Game Bar actually is, every shortcut that controls it, where the files land, what it flatly refuses to record, and the built-in alternative Microsoft now points to for the one case Game Bar was never designed for. What Game Bar Actually Is Xbox Game Bar is the overlay that opens with Win+G . "No extra software is needed" is correct, but it's worth knowing why: it's shipped as part of Windows since the 2016 Anniversary Update, originally built for capturing gameplay clips, and it records whatever app currently has focus — game or not. It's a Microsoft Store app tied to the Xbox identity stack, which is also why the first launch on a fresh install sometimes prompts for an Xbox sign-in before the capture tools become available. Every Shortcut ...

The video above shows Task View in action, but it never says what you're looking at or why it matters on the exam. This guide fills in the rest: every shortcut and menu path for creating, switching, and closing virtual desktops, which features are genuinely new to Windows 11 and which ones go back further than most people assume, and the one distinction — between a virtual desktop and a virtual desktop infrastructure — that trips up more exam-takers than the feature itself. What a Virtual Desktop Actually Is A virtual desktop is a separate workspace on the same physical screen, with its own set of open windows. Nothing about the hardware changes — there's still one monitor, one GPU, one running copy of Windows — Explorer just keeps several independent window arrangements in memory and shows you one at a time. Keep a browser and a ticketing system on one desktop, a build environment on a second, and a video call on a third, and switching between them replace...