Congratulations! If you are reading far enough to look at this book’s Introduction, you’ve probably already decided to pursue your Cisco CCNA Data Center certification. Cisco dominates the networking marketplace, and after a few short years of entering the server marketplace, Cisco has achieved significant market share and has become one of the primary vendors for server hardware. If you want to succeed as a technical person in the networking industry in general, and in data centers in particular, you need to know Cisco. Getting your CCNA Data Center certification is a great first step in building your skills and becoming a recognized authority in the data center field.