A user is having trouble accessing websites on a computer. A technician troubleshoots and tries to access a site the user typically visits but is instead presented with a completely different site…

Clearing the DNS cache removes any poisoned or stale DNS entries that may be resolving domain names to incorrect IP addresses. Checking the hosts file is equally important because malware commonly modifies it to statically redirect specific domains to attacker-controlled servers. Together, these two checks address the most common technical mechanisms behind browser redirection attacks.

An incorrect default gateway would affect all network connectivity broadly, not selectively redirect one specific website to a different destination.

Outbound firewall rule issues would block access to a site entirely rather than redirect the user to a different website.

Configuring IPv6 is unrelated to DNS poisoning or hosts file manipulation and would have no effect on a redirection issue.