From Seo Wiki - Search Engine Optimization and Programming Languages
If a webmaster wishes to restrict the information on their site available to a Googlebot, or another well-behaved spider, they can do so with the appropriate directives in a robots.txt file, or by adding the meta tag
<meta name="Googlebot" content="nofollow" /> to the webpage. Googlebot requests to Web servers are identifiable by a user-agent string containing "Googlebot" and a host address containing "googlebot.com".
Currently Googlebot only follows HREF links and SRC links. Googlebot discovers pages by harvesting all of the links on every page it finds. It then follows these links to other web pages. New web pages must be linked to other known pages on the web in order to be crawled and indexed or manually submitted by the webmaster.
A problem which webmasters have often noted with the Googlebot is that it takes up an enormous amount of bandwidth. This can cause websites to exceed their bandwidth limit and be taken down temporarily. This is especially troublesome for mirror sites which host many gigabytes of data. Google provides "Webmaster Tools" that allow website owners to throttle the crawl rate.
- ↑ 1.0 1.1 1.2 "Webmaster Tools". http://www.google.co.uk/intl/en_uk/webmasters/bot.html.
- ↑ Exact Googlebot client info can be found in Google-cached copies of pages which display such data to visitors. For example, see 
- ↑ "Stackoverflow-Blog about traffic generating Google Bot". http://www.codinghorror.com/blog/archives/001224.html.
- ↑ https://www.google.com/webmasters/tools/docs/en/about.html
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