The Microsoft Azure cloud is constantly evolving and it was time for me to update on the basics of Azure and more particularly the Hyperscale infrastructures of Azure datacenters I encourage you to read this :
Azure infrastructure security – Shared responsibility model
Directory of Azure Cloud Services
What are Availability Zones in Azure?
Azure Global Infrastructure
Azure Datacenter Video
Microsoft Global Datacenters and Network Infrastructure
Inside Azure datacenter architecture
Azure Trust Center
Last but not least, don’t forget to spend time on http://microsoft.com/learn where you can find additional materials to prepare your certification.