From this article you will know how to forbid search engine bots indexing and following certain links.
Solution

When web site is under construction, it is often stored within subfolder of the existing site so search engines are able to index it. And after the site moves to server root all indexed links …

This article is devoted to quick search engine optimization of Drupal sites. Drupal is the most search engine friendly, out of the box, solution today. Nevertheless you should get some thing done to any installation.

Drupal in my opinion is the most search engine friendly, out of the box, solution in existence today. However, with that said, there are still some things that need to be done to any installation …