I passed the Brocade Certified Network Designer certification yesterday. It was a good learning experience preparing for the exam and learning about Network Design. My study path for successfully achieving the certification included (among other things) reading the CCDA 4th Edition Book. (Hard copy straight from CiscoPress) and studying the BCND in a Nutshell Guide (Free – Online).
Rubbing shoulders with a few network architects at their blogs, podcasts & webinars also helps. If you’re interested you can look at @packetpushers, @etherealmind & @ioshints.