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comptia-a-plus-core2/labs/TRB-4-pc-security-symptoms-lab.md

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Lab TRB-4: PC Security Symptom Triage

Domain:

  • 3.0 Software Troubleshooting

Works on:

  • Windows
  • Linux comparison optional

Goal

Practice security symptom triage without changing browser profiles or deleting files.

Part 1: Browser Checks

Record:

  • Browser extension count:
  • Default search engine:
  • Proxy setting location found:
  • Certificate warning seen on normal sites, yes or no:
  • Pop-up and notification permissions location found:

Part 2: Windows Checks

Windows:

Get-ComputerInfo | Select-Object OsName,OsVersion
Get-Date
netsh winhttp show proxy

Record:

  • OS version:
  • System date/time:
  • Proxy status:

Part 3: Scenario Triage

For each symptom, list likely cause and first action:

  1. Files are renamed and cannot be opened.
  2. Browser searches redirect to an unfamiliar site.
  3. Fake antivirus warnings demand payment.
  4. Windows Update fails on a previously infected PC.
  5. A banking site certificate warning appears.

What You Should Learn

  • Security troubleshooting starts with symptoms and risk.
  • Some symptoms require isolation before normal repair.
  • Browser settings, proxy settings, date/time, and extensions can explain many security symptoms.