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comptia-a-plus-core2/labs/OS-4-command-line-lab.md

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Lab OS-4: Command-Line Troubleshooting

Domain:

  • 1.0 Operating Systems

Works on:

  • Windows
  • Linux

Does not require:

  • macOS

Goal

Build comfort entering commands and interpreting basic troubleshooting output.

Windows Steps

Run:

hostname
whoami
winver
ipconfig
ipconfig /all
ping 127.0.0.1
nslookup example.com
netstat -ano
sfc /scannow
ipconfig /?

Record:

  • Computer name:
  • Current user:
  • Windows version/build:
  • IPv4 address:
  • Default gateway:
  • DNS server:
  • Loopback ping successful:
  • DNS lookup successful:
  • One active/listening port:
  • SFC result:

Linux Steps

Run:

hostname
whoami
ip addr
ping -c 4 127.0.0.1
df -h
ps aux
top

Press q to exit top.

Record:

  • Hostname:
  • Current user:
  • IP address:
  • Root filesystem free space:
  • One running process:

Safety Notes

Do not run destructive disk commands in this lab.

Know these for the exam, but do not experiment casually:

  • format
  • diskpart
  • robocopy with mirror/delete options
  • chkdsk /f or chkdsk /r on important disks without planning

What You Should Learn

  • ipconfig /all gives detailed IP configuration.
  • ping tests reachability.
  • nslookup tests DNS.
  • netstat -ano shows connections, ports, and process IDs.
  • sfc /scannow repairs protected Windows system files.
  • /? shows command help.