And ofcourse :
The CCA certification program focuses on the skills and knowledge foundation necessary to successfully support an existing implementation of specific Citrix products. System administrators, Citrix resellers and business affiliates, and independent consultants will find that the CCA certification is an excellent credential.
Certification Requirements
Note: Citrix Solution Advisor (CSA) requirements pertaining to certification differ for each region. Please contact your regional channel representative for additional information.
Select from the following CCA tracks:
CCA for XenApp (Presentation Server 4)
Citrix Certified Administrator for Citrix Provisioning Server 4
Citrix Certified Administrator for Citrix Password Manager 4
Citrix Certified Administrator for Citrix Access Gateway 4
Citrix Certified Administrator for Citrix Access Gateway 8 Enterprise Edition
Citrix Certified Administrator for Citrix NetScaler 8
Citrix Certified Administrator for Citrix EdgeSight 4
Citrix Certified Administrator for Citrix WANScaler 4
Citrix Certified Administrator for XenServer Enterprise Edition 4
The following CCA tracks are no longer attainable, though remain valid certifications. For information on the requirements of these tracks, or your certification status, please refer to Certification Manager
Citrix Certified Administrator for MetaFrame Access Suite 3.0
Citrix Certified Administrator for MetaFrame XP Presentation Server
Here : http://www.certbible.org/citrix-certified-administrator-cca/