Reliability pillar principles in Azure - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Azure Availability Zones

Which statement best describes the purpose of Azure Availability Zones in the context of the Reliability pillar?

A They are a type of Azure virtual machine optimized for high compute workloads.

B They are used to increase the speed of data transfer within a single datacenter.

C They automatically back up data to an external cloud provider.

D They provide isolated locations within an Azure region to protect applications from datacenter failures.

💡 Hint

Think about how to keep your app running even if one part of the datacenter stops working.

Azure Availability Zones are physically separate locations within an Azure region. They help keep applications running by isolating failures to one zone.

❓ Architecture

intermediate

Designing for Fault Tolerance in Azure

You want to design an Azure solution that continues working even if one virtual machine fails. Which Azure service or feature should you use?

A Azure Virtual Machine Scale Sets with multiple instances across Availability Zones.

B Azure Blob Storage with geo-redundant storage.

C Azure Functions with a single instance plan.

D Azure Virtual Network peering.

💡 Hint

Think about running many copies of your app to handle failures.

Virtual Machine Scale Sets allow you to run multiple VM instances across zones, so if one fails, others keep running.

❓ security

advanced

Impact of Security on Reliability

Which security practice directly supports the Reliability pillar by preventing unauthorized changes that could cause downtime?

A Using Azure Security Center to scan for malware on virtual machines.

B Implementing Azure Role-Based Access Control (RBAC) to limit who can modify resources.

C Encrypting data at rest using Azure Storage Service Encryption.

D Configuring Azure Firewall to block all inbound traffic.

💡 Hint

Think about controlling who can change your cloud setup.

Azure RBAC restricts permissions to only authorized users, reducing the risk of accidental or malicious changes that could cause outages.

❓ service_behavior

advanced

Azure Service Behavior Under Failure

What happens to Azure SQL Database when a hardware failure occurs in the primary region configured with geo-replication?

A The system automatically fails over to the secondary region with minimal downtime.

B The primary database switches to read-only mode but continues serving queries.

C Data is lost because geo-replication only backs up data once a day.

D The database becomes unavailable until manual intervention restores it.

💡 Hint

Consider how geo-replication helps keep data available during failures.

Geo-replication creates a readable secondary database in another region. If the primary fails, Azure automatically switches to the secondary to keep the database available.

✅ Best Practice

expert

Implementing Reliable Backup Strategies in Azure

You need to ensure your Azure virtual machines can be restored quickly after accidental deletion or corruption. Which backup strategy best supports the Reliability pillar?

A Create VM images only during initial deployment.

B Rely on Azure Site Recovery without regular backups.

C Use Azure Backup service with application-consistent snapshots and retention policies.

D Manually copy VM disks to a storage account once a month.

💡 Hint

Think about automated, consistent backups that can restore your VM state.

Azure Backup provides automated, application-consistent snapshots with retention policies, enabling quick and reliable recovery of VMs.