Common Network Troubleshooting

Summary

A practical toolkit (ping, traceroute, curl, netstat/ss) for diagnosing connectivity issues — knowing where to look first turns a multi-hour outage investigation into a 10-minute fix.

How to Learn This

1Practice using ping and traceroute to diagnose a connectivity issue.
2Use curl to test an HTTP endpoint's response directly from the command line.
3Learn a systematic troubleshooting order: local machine, DNS, network path, then the remote server.

VPNs & Private Networking

Git Fundamentals

More topics in Networking Fundamentals

OSI & TCP/IP Models IP Addressing & Subnetting DNS HTTP/HTTPS & TLS Load Balancers Firewalls & Security Groups Reverse Proxies (Nginx)VPNs & Private Networking

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