Diagnosing and resolving a DNS resolution failure on a Linux system involves a series of steps to identify the cause of the problem and implement appropriate solutions. DNS resolution is the process of translating domain names (like 'google.com') into IP addresses (like '142.250.185.142'), which computers use to communicate with each other. First, check network connectivity. Verify that the system has a valid network connection. Use the `ping` command to test connectivity to a known IP address, such as a public DNS server like Google's (8.8.8.8): `ping 8.8.8.8`. If the ping is successful, it indicates that the system has basic network connectivity. If the ping fails, troubleshoot network issues such as cable connections, Wi-Fi connectivity, or firewall rules. Second, check the DNS server configuration. Determine which DNS servers the system is configured to use. The DNS server settings are typically stored in the `/etc/resolv.conf` file. You can view the contents of this file using the command: `cat /etc/resolv.conf`. The file should contain one or more `nameserver` entries, specifying the IP addresses of the DNS servers. If the file is empty or contains incorrect DNS server addresses, edit the file to add or correct the `nameserver` entries. For example: `nameserver 8.8.8.8` and `nameserver 8.....
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