Dear Mark:
As an entry-level (or at most, a just-barely-mid-level) certification, the CCDA aims to identify individuals who know how to design relatively modest networks around Cisco systems and components. If you do some poking around at a few Web sites -- most notably, http://www.gocertify.com, http://www.itcertinfo.com, and http://www.certcities.com -- you should be able to learn plenty about the CCDA and other certifications that might interest you. The recommended course of study to obtain a CCDA is to first obtain the CCNA. If you're starting from scratch, I'd precede that with the CompTIA Network+ and i-Net+ certifications as well.
I hope this answers your questions, or at least lets you know where to go looking for more answers. Good luck with your program of study.
--Ed--
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