Operating Systems: a practical CompTIA A+ guide
Windows tools, permissions, Linux basics, and recovery strategy. Learn the mental models, common failure modes, and evidence-based troubleshooting steps.
01. Choose the right Windows tool
Task Manager identifies resource-consuming processes; Event Viewer provides logs and timestamps; Device Manager surfaces drivers and hardware errors; Disk Management shows partitions and volumes; Services manages service state; Reliability Monitor tracks failures over time. Correlate findings rather than using tools in isolation.
02. File systems and permissions
NTFS supports Windows access control lists and encryption-related features. FAT32 has broad compatibility but a 4 GiB single-file limit. exFAT is useful for large removable media. Effective access may reflect share permissions, NTFS permissions, group membership and inherited rules; apply least privilege rather than granting broad administrative rights.
03. Recovery sequence
Before repair, protect data if possible and note recent changes. Safe Mode reduces drivers/services; Startup Repair addresses certain boot problems; System Restore rolls back supported system changes; sfc /scannow checks protected Windows system files; DISM can repair the component store. A reset or reinstall is higher impact and should not be the default first step.
04. Command line in context
ipconfig /all: view addresses; ping: test IP reachability; tracert: inspect network path; nslookup: DNS troubleshooting; netstat: connections; chkdsk: file-system checks; sfc: protected system files. On Linux, ls lists files, chmod modifies permissions, grep searches matching text, and sudo runs with authorized privilege. Validate scope and risk before executing commands.
Apply the lesson: real support cases
A Windows app crashes every morning at 9:00. Compare Event Viewer timestamps with scheduled tasks and application logs.
A USB drive must hold a 7 GB file for Windows/macOS transfer. FAT32 is unsuitable because of its per-file size limit; consider exFAT.
These are original explanatory notes aligned to the named exam domains; review the current official objectives for exact scope. The mock exam is practice only and is not scored on CompTIA's scale.