Kentico handles this without modifying your web.config. I'd suggest reading up on their documentation. If /Test1 is an actual document within your content tree, you can add a URL alias to that document of /Test. By default when /Test is requested it will serve up /Test1. If you want it to fully perform a redirect, then change your settings in the Site Manager>Settings>URLs and SEO to Allow permanent (301) redirection and Redirect document aliases to main URL. This will then perform a 301 redirect when /Test is requested to /Test1.