Introduction
With the increasing dominance of cloud computing in the IT industry, Microsoft Azure is a prominent platform for building large-scale solutions. Whether you have just started your career or want to advance to a senior position, preparation is vital for technical interviews. The guide below includes an exhaustive list of questions and answers related to Microsoft Azure that help beginners and experts alike prepare well for their interviews.
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Azure Interview Questions and Answers for Freshers
Preparation for entry-level cloud jobs necessitates the understanding of fundamentals and how cloud resources function. Listed below are 10 fundamental questions for getting familiarized.
1. Explain Microsoft Azure?
Microsoft Azure is a cloud computing platform by Microsoft. It allows customers access to resources such as VMs, databases, and networks. The working principle includes virtualization which is the process of running several virtual machines in physical servers that are present in global data centers by utilizing a hypervisor. Users can manage the resources through Azure Portal and command-line tools to design their applications.
2. Distinguish between IaaS, PaaS, and SaaS.
- IaaS – (Infrastructure): Rents infrastructure from the cloud provider (e.g., VMs). The customer will have control over the OS and applications.
- PaaS – (Platform): A development environment provided by Azure (e.g., Azure App Service). The user will have control over the code only.
- SaaS – (Software): A ready-to-use application provided by Azure (e.g., Microsoft 365). Azure manages everything; the customer has no control.
3. Azure Resource Groups
Resource Groups are logical groupings of resources used in an Azure solution. The concept allows you to manage the deployment, update, and deletion of resources as a single entity (for example, a VM, disk, or virtual network), which ensures proper organization and monitoring of resource billing.
4. What is a Virtual Network (VNet)?
VNet is a private network in the cloud that enables the secure exchange of information between Azure resources and the internet/on-premises networks. This helps to isolate and segment resources. A Virtual Network can be created through the Azure CLI:
az network vnet create –name MyVnet –resource-group MyRG –address-prefix 10.0.0.0/16
5. Why use Azure Load Balancer?
Azure Load Balancer routes network traffic to the set of backend servers or services. It provides high availability and reliability by ensuring that if one of the servers stops working, traffic will be redirected to the functioning ones, avoiding downtime for the end-user applications.
6. Compare Public, Private, and Hybrid Clouds.
- Public Cloud: Services provided through the internet and shared among various organizations.
- Private Cloud: All cloud computing resources are dedicated to one company.
- Hybrid Cloud: Merging of public and private cloud features that facilitate the movement of data and applications between the two environments.
7. Define Azure Blob Storage.
Azure Blob Storage is meant to store large amounts of unstructured data, like text and binary files. Its best use case is for delivering images to a web browser, streaming videos, or keeping backups. Blob Storage allows accessing its contents through URLs.
8. What are Azure Availability Sets?
An availability set is a configuration to ensure that VMs are placed on different physical servers, racks, and switches. It prevents your application from being affected by hardware failures in a data center and/or during maintenance. At least one VM will be active throughout the process.
9. How would you secure Azure resources?
Identity security is provided by Azure Active Directory (Entra ID), and filtering of traffic is achieved using Network Security Groups (NSGs), where each network security group works like a firewall. The following command enables you to define a rule to allow traffic on Port 22:
az network nsg rule create –resource-group MyRG –nsg-name MyNSG –name AllowSSH –priority 100 –destination-port-ranges 22 –access Allow
10. What is Azure PowerShell, and how would you use it?
Azure PowerShell is a module with cmdlets designed to interact with Azure resources. Azure PowerShell is used to perform tasks such as creating and deleting resource groups and resources.
Azure Interview Questions and Answers for Experienced Professionals
These questions deal with architecture, scalability, security, and automation for senior cloud jobs.
11. Azure Traffic Manager versus Azure Front Door – which one to use under what conditions?
Both of these are routing products, but they work at different levels of the protocol stack:
- Azure Traffic Manager: A DNS-based load balancer. It routes users to the closest endpoint using DNS lookups. It is best suited for non-HTTP protocols or when it is important to connect to the nearest regional endpoint to reduce latency.
- Azure Front Door: A Layer 7 (HTTP/HTTPS) load balancer. It uses Anycast routing to connect users to the nearest point of presence (PoP) and offers SSL offloading, WAF, and path-based routing.
- Recommendation: Use Azure Front Door for web applications needing high availability and security. Use Azure Traffic Manager for routing non-HTTP protocols globally.
2. How can you implement Zero Trust Security in an Azure cloud environment?
To adopt Zero Trust Security, one needs to switch from the concept of “perimeter-only” to “never trust, always verify.” The following will help implement it:
- Identity: Multi-Factor Authentication and Conditional Access policies are implemented using Microsoft Entra ID.
- Network: Microsegmentation is achieved by NSG and ASG in Azure.
- Encryption: Data is protected both at rest (encryption of data with the help of Azure Key Vault) and in transit (use of TLS).
- Governance: Azure Policy is employed to block any resource creation that violates compliance.
- Least Privilege: RBAC & PIM should be used here.
3. Explain the Hub-and-Spoke Architecture in Azure and its advantages.
In hub-and-spoke architecture, a central virtual network called the Hub serves as a connectivity point between on-premises networks and shared services like Azure Firewall or Azure Virtual Network Gateway. The Spokes virtual networks establish peering with the Hub and isolate individual applications.
- Advantages: Centralized control over shared services, reduced cost by using costly gateways collectively, and improved security by enforcing all spoke-to-spoke communications to pass through a firewall in the Hub.
- Configuration: Peering should be enabled with “Gateway Transit” capabilities from the Hub to the Spokes.
4. Define Azure Managed Identities and their advantages over Service Principals.
Managed Identities removes the requirement for developers to incorporate authentication secrets (credentials) into their applications.
- System-Assigned Identity: Directly bound to a specific resource (such as a VM).
- User-Assigned Identity: An independent resource that can be attached to any number of Azure services.
Advantages over Service Principals: In contrast to Service Principals, there are no secrets associated with Managed Identities, which cannot expire or get compromised. Azure automatically manages and rotates the identities’ credentials, minimizing the risk of account compromise due to credential mismanagement.
5. How do you automate your deployment of a multilayered application in Bicep/Terraform?
Experienced practitioners leverage IaC in order to guarantee idempotency and versioning.
- Modularity: Segmentation of the code into modules (e.g., Network, Compute, Database).
- State management: Remote backend usage (Azure storage) for storing Terraform states.
Example (Bicep Script):
resource vnet ‘Microsoft.Network/virtualNetworks@2023-05-01’ = {
name: ‘prod-vnet’
location: resourceGroup().location
properties: {
addressSpace: { addressPrefixes: [‘10.0.0.0/16’] }
}
}
- CI/CD: Implement these scripts using GitHub Actions or Azure DevOps pipelines for automation during provisioning of Dev, QA, and Prod environments.
6. Elaborate on “Infrastructure Drift” and its resolution strategy.
Infrastructure Drift refers to any situation in which the current infrastructure is not aligned with what is defined in the infrastructure code.
Detect: Perform Terraform plan for detecting drifts or use Azure Policy with the effect “DeployIfNotExists”.
Remedy:
- Run the IaC pipeline for overriding the manual modifications.
- Add the manual modifications to the codebase if these changes make sense.
- Query Azure Resource Graph for analyzing the current state of all resources across different subscriptions.
7. What can be done to minimize costs in an Azure setup at scale?
Cost optimization should be a priority for senior cloud engineers. These include:
Azure Reservations: Purchase of 1 or 3 years upfront for consistent loads (VMs, SQL), and you can cut your costs by up to 72%.
- Spot Instances: Leveraging leftover capacity and saving money on interruption loads.
- Right Sizing: Using Azure Advisor for under-provisioned resources.
- Auto Scaling: Use of Scale Sets (VMSS) to make sure that you only pay for computing during busy periods.
- Tagging: Enforce rigorous tagging practices to ensure accurate cost allocation per department/project.
8. Describe the differences between Azure Service Bus vs. Azure Storage Queues.
Although both deal with asynchronous messaging, the following differentiates them:
- Storage Queue: Basic queue with up to 500 TB of messages. No added features. Best suited for basic queuing of tasks.
- Azure Service Bus: Enterprise-level message broker.
- Features: Allows use of Topics for Pub/Sub messaging pattern, support for sessions with FIFO ordering, Transactions, and dead-lettering queues.
- Uses: When ordering, more complicated routing logic, or duplicate detection is needed in the Microservice architecture, use Service Bus.
9. How do you perform Disaster Recovery on Azure using Azure Site Recovery (ASR)?
ASR offers Business Continuity and Disaster Recovery services. This is done through orchestrating VM Replication.
- VM Replication: Continuous replication from Primary Region to Secondary Region.
- Recovery Plan: Script-like recovery order of the VMs (example, Database VM, followed by Application Server VM, and finally Web Servers)
- Practice DR Plans: Test Failover to a separate isolated network for practice purposes.
- Recovery Objectives: The Recovery Point Objective can be reduced to minutes, and the Recovery Time Objective to hours.
10. Describe AKS Networking: Comparison of Kubernet (Basic) with Azure CNI (Advanced).
- Kubernet (Basic): Nodes are assigned a private IP address from the Virtual Network, while pods get their own from a separate, virtualized address space. Route Tables are needed for communication between pods. More difficult to implement than Azure CNI, but conserves IPs on the VNet subnet.
- Azure CNI (Advanced): Each pod has a “real” IP address from the VNet Subnet. Direct connectivity to other resources in the VNet is possible, without any routing required. Faster connection and enables Network Policies like Calico or Azure, yet IP allocation becomes more challenging.
Conclusion
Achieving success in the Microsoft Azure interview requires a combination of both theoretical knowledge and problem-solving skills. Regardless of whether you are new to cloud storage services or a seasoned professional architecting intricate hub-and-spoke architectures, it is important to keep abreast of all changes that occur within the Azure environment. Utilize these Azure interview questions and answers to assess your knowledge and find out how various services can be used together to address business problems in your organization.
If you need additional practical knowledge that would complement the theory that you already possess, consider taking up a mentorship program offered by experts. Become a Microsoft Azure Specialist with our software training institute in Chennai.