CompTIA A+ Core 2 (220-1202) Cheat Sheet
High-yield review of operating systems, endpoint security, permissions, recovery tools, scripting, and operational procedures for CompTIA A+ Core 2.
On this page
Use this for last-mile review. Star weak rows and re-drill with practice.
Final 20-minute recall (exam day)
Cue -> best move (scenario map)
| If the question says… | Usually best answer |
|---|---|
| PC unstable after update/driver | Safe Mode -> rollback/update removal -> logs -> sfc/DISM |
| “Access denied” on shared folder | Evaluate share + NTFS effective permissions, ownership, elevation |
| Browser popups/hijack symptoms | Malware workflow + extension cleanup + DNS/hosts verification |
| BitLocker recovery prompt | TPM/hardware change path, recover key from approved store |
| User needs app but not admin rights | Least privilege + Run as needed + allow-list approach |
| Domain login slow/failing | DNS to DC, network profile/firewall, time sync, GPO processing |
| Suspicious process persistence | Startup items/services/tasks + EDR/AV scan + containment |
| Need secure remote support | VPN + MFA + controlled RDP/remote tooling with logging |
| Repeated helpdesk issue | Document root cause + standardize fix/runbook |
| New script for operations | Test in non-prod, parameterize, log actions, least privilege execution |
Must-memorize Core 2 anchors
| Topic | Fast recall |
|---|---|
| Recovery order | Identify -> contain -> eradicate -> recover -> lessons learned |
| WinRE tools | Startup Repair, System Restore, Uninstall Updates, Command Prompt |
| Health repair pair | DISM /RestoreHealth + sfc /scannow |
| Permission rule | Most restrictive effective access wins |
| Security baseline | Patching, AV, firewall, MFA, least privilege |
| Data handling | Need-to-know access, encryption, secure disposal |
Last-minute traps
- Disabling security controls as first troubleshooting step.
- Confusing local account issues with domain/DNS/time issues.
- Applying broad admin permissions instead of scoped rights.
- Skipping documentation/change control for “quick fixes.”
1) Windows editions & features (quick map)
| Feature | Home | Pro | Enterprise/Education | Notes |
|---|---|---|---|---|
| Domain join / Group Policy | ✗ | ✓ | ✓ | Business environments |
| BitLocker | ✗ | ✓ | ✓ | Full-disk encryption |
| Hyper-V | ✗ | ✓ | ✓ | Virtualization |
| Remote Desktop host | ✗ | ✓ | ✓ | Client → host access |
| Assigned Access / AppLocker | ✗ | Limited | ✓ | Kiosk / allow-lists |
2) Core Windows tools (where to click)
| Need | Tool | Path |
|---|---|---|
| System overview | System / About | Settings → System → About |
| Device drivers | Device Manager | Win+X → Device Manager |
| Network basics | Network & Internet | Settings → Network & Internet |
| Local security | Local Security Policy | secpol.msc (Pro+) |
| Local users/groups | lusrmgr.msc | Pro+ (not Home) |
| Services | Services | services.msc |
| Disk tasks | Disk Management | diskmgmt.msc |
| Resource view | Task Manager | Ctrl+Shift+Esc |
| Logs | Event Viewer | eventvwr.msc |
3) Windows command quickies
| Task | Command | Notes |
|---|---|---|
| IP/DNS | ipconfig /all | Stack config |
| Reachability | ping, tracert | Path/latency |
| Name lookup | nslookup | DNS test |
| Filesystem check | chkdsk /f | Fix errors (may require reboot) |
| System files | sfc /scannow | Verify/repair protected files |
| Image repair | DISM /Online /Cleanup-Image /RestoreHealth | Use before/after SFC |
| Boot repair | bootrec /fixmbr bootrec /fixboot bootrec /rebuildbcd | WinRE |
| Boot config | bcdedit | Edit boot entries |
| Startup apps | taskmgr → Startup tab | Enable/disable |
| Processes | tasklist, taskkill /PID n /F | CLI control |
| Policy refresh | gpupdate /force | Pro+ |
4) Startup, recovery & reset
- Safe Mode: Shift+Restart → Troubleshoot → Advanced → Startup Settings.
- WinRE tools: Startup Repair, System Restore, Command Prompt, Uninstall Updates, UEFI Firmware Settings.
- System Restore: Roll back system files/registry (not documents).
- Reset this PC: Keep files vs remove everything; local vs cloud reinstall.
- MSConfig (legacy): Diagnostic/Selective startup; today prefer Task Manager + Services.
5) Disks, file systems & shares
- NTFS: permissions, quotas, EFS; exFAT for flash; FAT32 legacy.
- Share vs NTFS permissions: Effective = most restrictive. Share applies over network; NTFS local & network.
- Attributes: Read-only, Hidden, System; show via Folder Options.
- Map network drive: Explorer or
net use Z: \\server\share /user:DOMAIN\user.
6) Accounts, UAC & permissions
- Local vs Microsoft accounts; Groups: Administrators, Users, Guests.
- UAC: prompts on elevation; keep at default or higher.
- Least privilege: standard user for daily tasks; elevate only when needed.
- Run as: Shift-right-click → Run as different user.
7) Security hardening (Windows)
- Updates: Windows Update automatic.
- Defender AV/Firewall: on by default; real-time + periodic scans.
- Firewall profiles: Domain, Private, Public; set correct network profile.
- BitLocker (Pro+): TPM + PIN for best protection; store recovery key safely.
- RDP: allow only when required; restrict via firewall, NLA, and groups.
- Account policies: lockout thresholds; password length/age (or passphrases + MFA).
8) Malware response (CompTIA order)
- Identify symptoms (pop-ups, slowdowns, unknown processes).
- Quarantine the system (isolate network, no file sharing).
- Disable System Restore (prevents re-infection from restore points).
- Remediate: update definitions, Safe Mode scan, remove malware; reimage if needed.
- Schedule scans / updates; enable System Restore.
- Create restore point.
- Educate the user (phishing, attachments, macros, downloads).
9) macOS essentials
| Need | Tool | Path |
|---|---|---|
| System info | About This Mac | → About |
| Activity | Activity Monitor | Applications → Utilities |
| Disks | Disk Utility | Apps → Utilities |
| Updates | System Settings → General → Software Update | |
| Terminal | bash/zsh | Apps → Utilities |
- Time Machine backups; FileVault full-disk encryption; Keychain passwords/certs.
10) Linux essentials
- Package managers:
apt,dnf,yum,pacman. - Services:
systemctl status|start|stop <svc>. - Network:
ip a,ip r,nmcli,ping,dig. - Permissions:
chmod,chown,sudo. - Logs:
/var/log,journalctl. - Editors:
nano,vi.
11) Mobile OS & MDM (Core 2 depth)
- iOS: Face ID/Touch ID, iCloud, Screen Time, profiles via MDM.
- Android: Google account, biometric unlock, app permissions, Work Profile.
- MDM controls: passcode policy, remote lock/wipe, app allow/deny, Wi-Fi/VPN profiles, certificate deployment.
- Secure comms: company portal apps, per-app VPN, device compliance checks.
12) Authentication & access
- Something you know/have/are; prefer MFA.
- Biometrics: Windows Hello, Touch ID, Android biometrics.
- Certificates/Smart cards in enterprise; 802.1X (awareness).
- SSO improves UX; still enforce least privilege.
13) Scripting basics (PowerShell, Bash, Python)
- PowerShell: objects,
Get-Command,Get-Help,Get-Service,Get-Process, pipes; run as admin. - Bash: shebang
#!/usr/bin/env bash, variables,if/for, exit codes$?. - Python: shebang,
venv,pip, simple file/OS tasks. - Task scheduling: Task Scheduler (Windows),
cron/systemd timers(Linux). - Safety: test in non-prod; log actions; parameterize paths; validate inputs.
14) Operational procedures
- Documentation: ticket notes, change records, asset tags, diagrams.
- Change management: request → assess risk → approvals → maintenance window → backout plan → comms.
- Incident response: identify → contain → eradicate → recover → lessons learned.
- SLAs/OLAs: response vs resolution targets; prioritize accordingly.
- Professionalism: active listening, empathy, avoid jargon, confirm resolution, follow-up.
15) Privacy, safety & disposal
- PII/PHI/PCI: handle on a need-to-know basis; encrypt at rest/in transit.
- Safety: ESD strap/mat, proper lifting, cable management, power off & unplug before service.
- Disposal: shred/drill platters, secure erase/crypto-erase SSDs, follow e-waste laws.
16) Quick pickers (scenario speed)
- App won’t start after update → Safe Mode, roll back/uninstall, Event Viewer,
sfc/DISM. - Slow login on domain → Network profile/Public firewall, DNS to domain controller, GPO processing.
- High CPU/Mem → Task Manager → sort by usage; check startup items/services.
- Disk 100% → Resource Monitor; check Superfetch/SysMain, updates, AV scan, SMART.
- Browser hijack → Extensions/add-ons, reset profile, DNS, hosts file, full malware workflow.
- Access denied → NTFS permissions vs share; ownership; run elevated.
- BitLocker prompt for key → Hardware change/TPM event; retrieve key from Azure AD/AD or printed copy.
How to use: If you hesitate on any row, convert it into a 2-bullet rule of thumb and drill a 20–25 question set on that topic tomorrow.
Quiz
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From here, move to the FAQ for deeper workflow explanations or use the resources page for official exam details and platform references.