IT fundamentals cheat sheets

Everyday troubleshooting references for Windows and Linux hosts: addressing, DNS resolution, TCP reachability, service state, event logs and listening sockets.

3 free references in this topic. Each lists the command, what it inspects and how to read the result.

• Linux network essentials — A small toolkit for inspecting a Linux host’s network.
• Windows network troubleshooting — Inspect addressing, DNS resolution and TCP reachability with PowerShell.
• Windows services and event logs — Build a focused picture of service state and recent system errors.