I want to take the CCDA Exam

in CCDA & CCDP
Hello Guys 
I decided to pursue the CCDA certification,, first of all: do I HAVE TO take CCNA first?? I read in their site that there are no prerequisites to taking the 640-864 DESGN exam..
I don't have cisco experience,, I'm a system administrator with Windows Server experience,, though I once watched a video course preparing for CCNA..
Also,, I really don't have the luxury to study everything,, I can only find two or four hours daily to study... Can I prepare in two months?? if not, how much time is required??
I already obtained the official study guide of Bruno and Jordan..
Please Advice

I decided to pursue the CCDA certification,, first of all: do I HAVE TO take CCNA first?? I read in their site that there are no prerequisites to taking the 640-864 DESGN exam..
I don't have cisco experience,, I'm a system administrator with Windows Server experience,, though I once watched a video course preparing for CCNA..
Also,, I really don't have the luxury to study everything,, I can only find two or four hours daily to study... Can I prepare in two months?? if not, how much time is required??
I already obtained the official study guide of Bruno and Jordan..
Please Advice

Comments
I really want a Design career,, and I think the CCAr career path is the best for me,, I once watched a video course on CCNA and all I remember is all those command-lines which I may never use
Announcement[/h] Beginning October 1, 2013, the CCENT certification will become a prerequisite prior to achieving the CCDA certification.
» Learn More.
Cisco Certified Design Associate (CCDA) is for network design engineers, technicians, and support engineers, who enable efficient network environments with an understanding of network design fundamentals. A CCDA certified network professional demonstrates the skills required to design basic campus, data center, security, voice, and wireless networks.
[h=2]Prerequisites[/h] There are no prerequisite certifications for CCDA, however knowledge at the CCNA level and the CCNP level for switching is recommended to pass the CCDA exam.
[h=2]CCDA Exams & Recommended Training[/h]
Required Exam(s)
Recommended Training
640-864 DESGN
Designing for Cisco Internetwork Solutions (DESGN)
NOTE: Updated ICND1, ICND2, and CCNA Composite exams can be applied towards the achievement of several Cisco associate-level certifications. Please visit the Associate-level Exam Logic Tool for more details.
My ultimate career goal: To climb to the top of the computer network industry food chain.
"Winning means you're willing to go longer, work harder, and give more than anyone else." - Vince Lombardi
Thanks everyone for replying..