- Check Ethernet cables for damage.
- Ensure cables are firmly plugged into NIC and switch/router.
- Confirm indicator LEDs are lit.
ipconfig /all (Windows) ifconfig -a (macOS/Linux)
Make sure the interface has a valid IP, subnet mask, and gateway.
ping 192.168.1.1
If no response, verify router is powered and the device is on the same subnet.
nslookup example.com
If DNS fails, try using a public DNS (8.8.8.8) or check your DNS server settings.
tracert example.com (Windows) traceroute example.com (macOS/Linux)
Identify where packets stop to pinpoint the failing hop.