Wired network connectivity and internet troubleshooting

3 quick checks≈5% of the testStretch

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By the end you’ll be able to

Diagnose physical wired network issues including no link light, damaged cable, incorrect cable type, loose connectors, bad wall jack, failed NIC and disabled network adapter.
Troubleshoot TCP/IP configuration problems such as incorrect IP address, subnet mask, default gateway, DNS settings, duplicate IP, APIPA assignment and DHCP failure.

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Resolve connectivity problems such as no network access, limited connectivity, intermittent connection, no internet access, inability to reach local resources and inability to reach remote resources.

Differentiate name resolution failures from routing or link failures by testing localhost, local IP, default gateway, DNS resolution and external reachability in a logical sequence.

Select and apply corrective actions such as renewing DHCP leases, resetting the adapter, correcting static settings, replacing cables, enabling the NIC, updating drivers or escalating upstream outages.

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