Once you have confirmed that the physical network is working, the next step is to troubleshoot your network and here we come to our topic which is Linux network commands and how to use them to troubleshoot your network.

1 Check Network Connectivity Using ping Command
2 Get DNS Records Using dig and host Commands
3 Diagnose Network Latency Using traceroute Command
4 mtr Command (Real-time Tracing)
5 Checking Connection Performance Using ss Command
6 Install and Use iftop Command For Traffic Monitoring
7 arp Command
8 Packet Analysis with tcpdump

https://likegeeks.com/linux-network-commands/

Hope you like it.
Regards,