Azure Interview Questions Part #2

Q #1 Explain the fault domain

that it is a logical working domain in which the underlying hardware is sharing a common power source and switch network. This means that when VMs is created the Azure distributes the VM across the fault domain that limits the potential impact of hardware failure, power interruption or outages of the network.

Q #2 Explain the Update domain

It is a logical group that undergoes maintenance by rebooting the system. The system automatically distributes the created VMs across the updated domain that enables the user to run any one of the applications while the Azure platform is undergoing maintenance. The update domain does not work sequentially to the manual rebooting.

Q #3 What is blob and how many types are there in Azure

Blobs – Blob stands for Binary large objects & Azure Blob storage is Microsoft's object storage solution for the cloud. Blob storage is optimized for storing massive amounts of unstructured data. We have 3 types of blobs

·                  Block blobs – this is made up of blocks of data that can be managed individually upto 4.7TB. It stores text and binary data.

·                    Append Blobs – this is also made up of block as block blob but are optimized for append operations. This is ideal for scenarios such as logging data from virtual machines.

·                    Page Blobs – This is for random access files up to 8 TB in size. Page blobs store virtual hard drive (VHD) files and serve as disks for Azure virtual machines

https://pachehra.blogspot.com/2019/12/azure-storage-account-lets-understand.html

Q #4 Difference between AV-Set and AV-Zone

https://pachehra.blogspot.com/2019/08/availability-sets-vs-availability-zones.html

https://www.youtube.com/watch?v=_e3dXbkq-pE&list=PL2rqVLfBxq_gnvnnfQVs1TlXU_cfPjnil

Q #5 What is Service Principle & if you have contributor access can you create Service Principle.

An Azure service principal is an identity created for use with applications, hosted services, and automated tools to access Azure resources. This access is restricted by the roles assigned to the service principal, giving you control over which resources can be accessed and at which level. For security reasons, it's always recommended to use service principals with automated tools rather than allowing them to log in with a user identity.

Create an App >> Assing Role (permissions) >> Use App ID & certificates to give access to the app, hosted service and automated tools.

Contributor can not create the SP because its about giving access to the application.

Q #6 Are there any restrictions on using IP addresses within these subnets and what’s the smallest subnet that we can create.

Yes. Azure reserves 5 IP addresses within each subnet. These are x.x.x.0-x.x.x.3 and the last address of the subnet. x.x.x.1-x.x.x.3 is reserved in each subnet for Azure services.

• x.x.x.0: Network address
• x.x.x.1: Reserved by Azure for the default gateway
• x.x.x.2, x.x.x.3: Reserved by Azure to map the Azure DNS IPs to the VNet space
• x.x.x.255: Network broadcast address

The smallest supported IPv4 subnet is /29, and the largest is /8 (using CIDR subnet definitions). IPv6 subnets must be exactly /64 in size.

Q #7 How to reset the local admin password of VM

We can do that from Azure portal from the VM pane under Support and troubleshooting we have Password reset Option.

Q #8 How to reset the NIC

https://docs.microsoft.com/en-us/azure/virtual-machines/troubleshooting/reset-network-interface

Q #9 Why we re-deploy the VM & what it does.

If you have been facing difficulties troubleshooting Remote Desktop (RDP) connection or application access to Windows-based Azure virtual machine (VM), redeploying the VM may help. When you redeploy a VM, Azure will shut down the VM, move the VM to a new node within the Azure infrastructure, and then power it back on, retaining all your configuration options and associated resources. You will loose the data on temp disk.

We can Redeploy from Azure portal under support and troubleshooting.

Q #10 What all you will do, if you are unable to RDP on Azure VM

1.     Reset Remote Desktop configuration.

2.     Check Network Security Group rules / Cloud Services endpoints.

3.     Review VM console logs.

4.     Reset the NIC for the VM.

5.     Check the VM Resource Health.

6.     Reset your VM password.

7.     Restart your VM.

8.     Redeploy your VM.

Stay Tuned for next part !!!!!!!