The Internet (such as Cisco's website) has a ton of free resources for learning objectives and homing your skills....
The information section below, for example, shows SearchNetworking.com's most popular CCNA certification material.
The biggest challenge you will face, however, is finding enough content to fully understand each objective on the exam. Not to mention, you will need to be proficient with configuring and troubleshooting Cisco routers and switches.
If your work has a lab or you have access to routers and switches that are not in production, then you can get your practice in that way. Otherwise, I fear you will have to secure some money to rent online rack access or even buy a set of used equipment.
For more information:
SearchNetworking.com has a CCNA exam preparation guide, as well as an all-inclusive Cisco certification guide.
This peer-written article series on how to pass your networking certifications has helped others pass everything from their CCNA to their MCSA.
In this Q&A interview, Wendell Odom, author of Cisco Press' best-selling CCNA certification book, gives advice on how to study for and pass your CCNA exam.
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