aakk9999 - 7:40 pm on Dec 21, 2013 (gmt 0)
You can point it so that both .com and .net resolve to the same IP, but you must implement redirect at the same time so that any request for any URL on .net domain redirects to the equivalent URL on your .com domain otherwise you will create duplicate of your .com domain content on the .net domain.
If your .htaccess follows the best practices then this should already be catered for.
Best practices for non-www to www redirection is something alongside the following lines: if the host is not www.example.com then redirect to www.example.com, which means that www.example.net would nicely redirect to www.example.com without a need to add new rules.
However you MUST test the redirect properly, not just for the domain root, but test that any URL on .com domain, if you replace .com with .net, will redirect to .com. It is so easy to leak large number of URLs to Google and so difficult and time consuming to remove them.