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One way of getting Cisco supports is to access their website. Cisco website is one of the most complete in perspective of IP technical documentations and solutions. There are numerous support for any IP network technology that apply not only for Cisco products, but also apply for any network products from any vendors in various network design, situations, conditions, and solutions.
Check out the following Official Cisco technical support sites as a start
Cisco Documentation Online
TAC Case Collection
Cisco FTP site
Download Cisco Software for public (without Smartnet contract)