The simplest way is by comparing what you expect a domain to be with your ISP's DNS response for that same domain. If these two values don't match, the DNS server's response has been spoofed. The results of these two commands should be the same. If they're not, then your ISP's DNS server has been spoofed.
C. DNS servers
When a user attempts to access a website and gets redirected to a different site, the issue often relates to DNS (Domain Name System) resolution problems. DNS is responsible for translating human-readable domain names (like www.example.com) into IP addresses that computers use to locate and connect to websites.
If the DNS servers are misconfigured or compromised, it can result in incorrect mappings, leading to unexpected website redirections. Therefore, the technician should first check the DNS server settings to ensure they are correct and not tampered with. This can involve verifying the DNS server IP addresses configured on the user's system or router and, if necessary, using a reliable DNS service or resetting the DNS settings to defaults.
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