Why can't I access the Internet after obtaining an IP address using DHCP?

Please refer to the following troubleshooting solutions:
1. Ensure that the terminal receives the correct network parameters assigned by the router and that the WAN port's parameters are in a different subnet from the router's LAN port;
2. Check if the computer's network parameters are correct;
3. Change the WAN port speed settings;
4. Clone the MAC address of a computer that can connect to the internet;
5. Replace the network cable connected to the router's WAN port (Cat 5e or Cat 6, 8-core cable);
6. Update the router system to the latest version;
7. Try resetting the router.