The recommended training is: VMware vSphere: Design and Deploy Fast Track [V6]
As per this page about the exam: VMware Certified Advanced Professional 6 – Data Center Virtualization Deployment Exam
Here are some resources/links that should help you prepare:
VCAP6-DCV Deployment Study Guide – vJenner Blog
https://thesaffageek.co.uk/vsphere-6-x-dcv-study-resources/vcap6-deploy-design/
VCAP6-DCV Deploy Practice | SOSTech
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