That was the most inaccurate description of DNS lookup I have ever read.
The idea that a bad entry in the local host file would send the browser to a different URL than the one the user types in does not wash. The host file is just a mapping from host names to IP addresses. A bad entry in the local host file (or a bad DNS lookup, which is much more likely) would have one of the following results:
1. If the IP address is good, and the web page exists at that IP address, the browser will load the web page from the server at that IP but the displayed URL would appear to be correct. This is very unlikely and would most likely be caused by deliberate spoofing.
2. If the IP address is good but the web page doesn't exist there, the browser will give a "file not found" error. But the URL in the browser search bar would be correct.
3. If the IP address is bad, then the browser would generate an "unable to connect" type of error. Again, the URL in the search bar would be correct.
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