When preparing for the Azure AZ-100 exam, you need to be sure that you know how to perform common day-to-day management tasks because you are going to encounter scenarios and questions that cover these topics.
This article is intended to provide you with a good foundation that covers topics found in the “Managing Azure VMs” learning objective of the AZ-100 exam. We’ll touch on common tasks such as adding managed data disks to a virtual machine (VM) and attaching additional NICs to an existing VM. Other topics that we’ll touch on will include how to manage VM configurations with Azure DSC and what Custom Script Extensions are. We’ll also discuss the process for moving VMs from one resource group to another, as well as how to redeploy VMs when the need arises.
The purpose of this article is to make you aware of what to expect on the AZ-100 exam. You won’t be an Azure expert after reading this article, but if you check out some of our courses such as this one, you’ll be ready to rock the AZ-100 exam.
Managed Data Disks
When using Managed Disks, Azure handles storage for you under the hood. Previously, when using Unmanaged Disk, you would have to create a storage accounts to hold your VM disks, which were essentially VHD files. If you needed to scale up, you had to create additional storage accounts to avoid exceeding the IOPS limit for storage with any of your disks. Using Managed Disks, you are no longer limited by storage account limits, including the 20,000 IOPS/account limit.
Managed Disks allow you to create up to 50,000 virtual machine (VM) disks per subscription, per region. As such, you can create thousands of VMs in a single subscription. Scalability of Virtual Machine Scale Sets is also improved because you can now create

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