What is the reason why the network cannot be connected?

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Reasons for network failure include hardware failure, network setting problems, network provider failure, and device software problems. Solution: 1. Hardware failure, check whether the network cable is plugged in properly, replace the network cable or restart the router to solve the problem; 2. Network setting problem, try to reconfigure the IP address, check whether the DNS server settings are correct, or reset the network settings. Just solve the problem; 3. If the network provider fails, contact the network provider to find out if there is a network failure and wait for the provider to fix the problem; 4. Equipment software problems, etc.