Network troubleshooting basics give you a repeatable way to find and fix connectivity problems without guessing. Below is a short, practical checklist and quick command cheat-sheet you can use right away when diagnosing home, lab, or small-business networks.
Why this works
- Focus on three questions: what changed, where the problem lives (device, LAN, WAN, app), and how to prove the fix.
- Use a layered (OSI/TCP-IP) approach and baseline testing so you can compare "working" vs "broken" behaviour.
Quick step-by-step workflow
- Establish a baseline: record device type, connection (Ethernet/Wi‑Fi), IP addressing, and typical performance.
- Define scope: single device or many users? Local app or external service?
- Layered checks: physical → link → network → transport → application.
- Run diagnostics and form hypotheses: ping, traceroute, DNS checks, and port tests.
- Apply minimal fix and verify with measurable tests.
- Document what changed and how you confirmed the issue was resolved.
Command cheat-sheet (fast reference)
- ping — basic reachability and latency
- traceroute / tracert — path and where packets stop
- ipconfig / ifconfig / ip addr — local IP and interface state
- nslookup / dig — DNS resolution checks
- netstat / ss — open connections and listening ports
Compact troubleshooting checklist
- Can the device reach the gateway? (ping gateway)
- Is DNS resolving? (nslookup/dig)
- Is the path to the remote host complete? (traceroute)
- Any recent changes or updates?
- Capture evidence: timestamps, command output, and screenshots.
Want the full walkthrough, printable checklist, and downloadable command cheat-sheet? Read the full guide and step‑by‑step method here
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