As of today the last update to the exam blueprint for VCA-DCV was in January 2014, suggesting it's based on vSphere 5.x - if you've used vSphere for any length of time you should find VCA-DCV fairly straightforward.
The launch of vSphere 6 (and many other new products) has caused updates to be made to the certifications, there is no VCA6-DCV at the moment but there will be soon: VMware Certification
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