Another option would have been to make a custom Block in Drupal with your 2 links as simply an HTML list.
So far as I know
/node/add/alert is 1 page in Drupal, Pylons, Joomla whatever .... its 1 page path to Apache or Nginx. The querystring is simply key-value pairs of arguments you are passing to the page.
The default Menu system in drupal doesnt allow for a single page to exist in more than 1 spot of your site (see NodeSymlink for a module that allows an alias of a page to live in different places of your site, but only 1 master location for the content).
I believe what you're seeing here is an example of drupal's 1 piece of content, lives only 1 place in drupal; so disallow multiple links to the same thing for SEO purposes.