High availability design patterns in Azure - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Architecture

intermediate

Understanding Azure Load Balancer behavior in HA setup

You deploy two virtual machines behind an Azure Load Balancer for high availability. One VM is healthy, the other is unhealthy. What will the Load Balancer do?

A It will send traffic to both VMs regardless of health status.

B It will send traffic only to the healthy VM and stop sending to the unhealthy one.

C It will stop sending traffic to both VMs until both are healthy.

D It will send traffic only to the unhealthy VM to try to recover it.

💡 Hint

Think about how load balancers maintain service availability by checking health probes.

Azure Load Balancer uses health probes to detect unhealthy VMs and routes traffic only to healthy instances to maintain availability.

❓ service_behavior

intermediate

Azure SQL Database failover behavior in HA configuration

You configure an Azure SQL Database with geo-replication for high availability. If the primary region fails, what happens to the database endpoint?

A The database endpoint switches to a read-only mode until manual intervention.

B The database endpoint remains pointing to the primary region and requires manual update.

C The database endpoint is deleted and must be recreated in the secondary region.

D The database endpoint automatically redirects to the secondary region after failover.

💡 Hint

Consider how geo-replication supports automatic failover to maintain availability.

Azure SQL Database geo-replication supports automatic failover where the endpoint redirects to the secondary region to maintain service continuity.

❓ security

advanced

Securing high availability Azure App Service with private endpoints

You want to secure your Azure App Service in a high availability setup by restricting access to only your virtual network. Which configuration achieves this?

A Use IP restrictions on the App Service to allow only your public IP addresses.

B Deploy the App Service in an isolated App Service Environment without private endpoints.

C Enable Private Endpoint for the App Service and integrate it with your virtual network.

D Configure a Network Security Group to block all inbound traffic to the App Service.

💡 Hint

Think about how private endpoints provide secure, private connectivity within a virtual network.

Private Endpoints allow Azure App Service to be accessed privately within a virtual network, enhancing security in HA setups.

✅ Best Practice

advanced

Designing multi-region high availability for Azure Storage accounts

Which Azure Storage redundancy option provides the highest availability and durability across regions?

A Geo-zone-redundant storage (GZRS)

B Locally-redundant storage (LRS)

C Read-access geo-redundant storage (RA-GRS)

D Zone-redundant storage (ZRS)

💡 Hint

Consider redundancy that combines zone and geo replication for maximum resilience.

GZRS replicates data across availability zones and regions, providing the highest availability and durability.

🧠 Conceptual

expert

Impact of Azure Traffic Manager routing methods on high availability

You configure Azure Traffic Manager with multiple endpoints in different regions. Which routing method ensures traffic is sent to the closest healthy endpoint to reduce latency and maintain availability?

A Performance routing method

B Priority routing method

C Weighted routing method

D Geographic routing method

💡 Hint

Think about routing methods that optimize for lowest network latency.

The Performance routing method directs traffic to the endpoint with the lowest network latency, improving availability and user experience.