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76 multiple-choice questions and 35 flashcards on Core 2 — Operating Systems, about 14% of the CompTIA A+ bank. Every one carries a written rationale.
Core 2 — Operating Systems is one of 9 chapters in CoStudy's CompTIA A+ bank, and it holds 76 of the bank's 540 multiple-choice questions — roughly 14% of the total. That proportion is not arbitrary: chapters follow the certifying body's published exam outline, and the number of questions in each is set by that domain's published weight, so the share of your practice time this chapter takes matches the share of the real exam it accounts for.
Studying by chapter is worth doing once you have a diagnostic score. A single overall percentage tells you whether you are close; it does not tell you which domain is dragging. Working a weak chapter in isolation, and re-testing it in isolation, is the fastest way to move a score that has stalled — and it is why the mock exams in CoStudy report by domain rather than as one number.
10 questions drawn from this chapter, with the full rationale shown — the controlling principle behind the right answer, and why each wrong option tempts and fails.
A macOS application downloaded from a developer's website refuses to open with a message that it cannot be verified. The feature responsible is:
Answer: B — Gatekeeper, which checks signing and notarization
A) synchronizes files and does not gate applications. B) Correct — Gatekeeper verifies developer signatures and notarization before permitting first launch. C) performs backups and never blocks execution. D) repairs and formats volumes; it has no launch role.
Which Linux command attaches a file system on a partition to a directory in the existing directory tree?
Answer: A — the mount command
A) Correct — mount associates a device's file system with a mount point in the tree. B) transfers data to or from URLs. C) prints the effective user name. D) searches text for patterns.
A Linux volume is nearly full. The technician needs to find which subdirectory under /var is consuming the most space. The MOST appropriate command is:
Answer: D — du -sh /var/*
A) reports free space per file system, which confirms the problem but does not localize it. B) checks integrity, which is a different concern. C) mounts entries listed in the file-system table. D) Correct — du summarizes usage per directory, and the wildcard with human-readable totals ranks the subdirectories.
Two users edit the same synchronized file offline and reconnect. The file-synchronization client creates a second copy labeled as a conflicted version. The BEST explanation is:
Answer: D — the client found divergent changes it could not merge
A) would produce an access-denied result rather than a preserved second copy. B) would typically surface as sync errors or re-downloads, not a labeled conflict copy. C) would block the upload outright with a size message. D) Correct — conflict copies are the standard outcome when two independent edits to one file cannot be reconciled, preserving both versions.
Which Windows install/upgrade method preserves user data and apps when going from Windows 10 to Windows 11?
Answer: D — In-place upgrade through the Installation Assistant
An in-place upgrade, run from Windows Update or the Installation Assistant, keeps apps and data. A clean install and a reset that removes everything both wipe the drive. mbr2gpt is a real tool for boot-mode preparation but is not itself the upgrade.
A user reports that a Windows 11 Home laptop cannot be configured with a local Group Policy setting the security team published. The BEST explanation is that:
Answer: C — Home does not ship the Group Policy Editor; registry edits are needed
A) is a plausible-sounding troubleshooting step but there is no policy to refresh. B) is wrong on the facts: the tool is not present at all rather than filtered. C) Correct — gpedit.msc is absent from Home, so equivalent configuration must be made through registry values or a management platform. D) confuses local policy with domain policy; local Group Policy works on standalone Pro machines.
An administrator must choose between NTFS and ReFS for a volume that will store user home directories with per-user disk quotas and file-level encryption. The BEST choice and reason is:
Answer: B — NTFS, because it supports quotas and encrypting file system
A) is false, as the two differ substantially in supported features. B) Correct — quotas and the encrypting file system remain NTFS capabilities that ReFS does not provide, so the requirement dictates NTFS. C) overstates ReFS, which targets specific data-volume resiliency scenarios rather than replacing NTFS everywhere. D) confuses integrity checksums with confidentiality; they detect corruption, not eavesdropping.
A Windows Server storage volume must self-heal from bit rot and verify data integrity using checksums, and it will not host the operating system. The MOST appropriate file system is:
Answer: B — ReFS, the resilient file system built for integrity streams
A) is a legacy file system with volume and file-size limits unsuited to this role. B) Correct — the Resilient File System uses checksums and, on mirrored storage, automatically repairs detected corruption, which is its defining purpose. C) is the standard Windows file system and journals metadata, but it does not checksum file data or self-heal. D) has no journaling or integrity features at all.
A user's Windows 11 machine shows a service that should start automatically but is stopped, and the technician needs to change both its startup type and its recovery action. The MOST appropriate tool is:
Answer: B — the Services console, editing the service properties
A) can launch a program at boot but does not configure a service's own restart behavior. B) Correct — services.msc exposes startup type and the Recovery tab that defines failure actions, which is exactly the pair required. C) shows live service resource use and can stop a service, but has no configuration surface. D) can enable or disable services for a diagnostic boot, yet it offers no recovery settings.
Which Windows tool is BEST for analyzing system performance issues over time?
Answer: B — Performance Monitor, for counters logged over time
B is right because Performance Monitor collects selected counters into data collector sets that can be reviewed as a trend, which is what analysis over time requires. A shows only the current instant and keeps no history. C reports static configuration, not behavior. D is a maintenance utility with no measurement role. E records discrete events rather than sampled performance counters, so it cannot show gradual degradation.
4 cards from the 35 in this chapter.
What is Spotlight on macOS?
System-wide search indexer — finds files, apps, definitions, calculations. Keyboard shortcut: ⌘+Space.
What's the difference between Reset, Refresh, and Reinstall?
Reset: keep or remove files, reinstall Windows. Refresh: reinstall keeping personal files (older). Reinstall: clean install from media.
What is the package manager for RHEL/Fedora?
dnf (replacing yum). Common: dnf install, dnf update, dnf remove. Underlying packages are RPMs.
Name the mainstream Windows 11 editions and the capability that distinguishes each tier.
Home, which cannot join a domain and lacks BitLocker management and Group Policy • Pro, which adds domain join, Group Policy, BitLocker, Remote Desktop hosting, and Hyper-V • Enterprise, which is volume licensed and adds advanced security and deployment management features on top of Pro.
These are a sample. The full Core 2 — Operating Systems chapter runs 111 items with per-chapter progress tracking, on the web and in the iOS app.