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The Cisco website has a lot of online documentation within it, ranging from troubleshooting tips to configuring and installation notes. There is also another side to the website, the Cisco University, which can be accessed via clicking the Technical Documentation link in the Useful Links menu on the right hand side on the main page.
It can also be accessed here.
A very useful link within the Cisco University for CCNA candidates and Cisco newbies is this. It contains an overview of all the internetworking technologies and protocols.
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