Redis connection and basic commands in Azure - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ service_behavior

intermediate

What happens when you try to connect to Azure Redis Cache with an incorrect access key?

You have an Azure Redis Cache instance. You try to connect using a Redis client but provide a wrong access key. What will be the result?

A The client connects and commands execute but data is lost.

B The client connects successfully but cannot execute commands.

C The client connection is refused with an authentication error.

D The client connection times out without any error.

💡 Hint

Think about what happens when credentials are invalid in a secure service.

Azure Redis Cache requires correct access keys for authentication. If the key is wrong, the connection is refused with an authentication error.

❓ Configuration

intermediate

Which Redis command sets a key with an expiration time in seconds?

You want to store a key-value pair in Redis that expires automatically after some time. Which command should you use?

A DEL key EX seconds

B SET key value EX seconds

C GET key EX seconds

D EXPIRE key value seconds

💡 Hint

Look for the command that sets a value and expiration together.

The SET command with the EX option sets the key and expiration time in seconds atomically.

❓ Architecture

advanced

How does Azure Redis Cache ensure high availability in a production environment?

Which architecture feature does Azure Redis Cache use to provide high availability and failover?

A Primary-replica replication with automatic failover

B Active geo-replication across regions

C Single instance with daily backups

D Manual snapshot restore on failure

💡 Hint

Think about how Redis handles failover automatically.

Azure Redis Cache uses primary-replica replication with automatic failover to maintain availability.

❓ security

advanced

Which practice improves security when connecting to Azure Redis Cache?

To secure your connection to Azure Redis Cache, which option is best?

A Allow all IP addresses to connect for easier access

B Use only the default access key without restrictions

C Disable authentication to simplify connections

D Use SSL/TLS encryption and firewall rules to restrict access

💡 Hint

Consider encryption and limiting who can connect.

Using SSL/TLS encrypts data in transit and firewall rules restrict access to trusted sources, improving security.

✅ Best Practice

expert

What is the recommended way to handle Redis connection failures in a cloud application?

Your cloud app connects to Azure Redis Cache. Sometimes connections fail due to network issues. What is the best practice to handle this?

A Retry connections with exponential backoff and jitter

B Immediately stop the app on first failure

C Ignore failures and continue without caching

D Restart the Redis server manually each time

💡 Hint

Think about how to avoid overwhelming the service during failures.

Retrying with exponential backoff and jitter prevents flooding Redis with retries and handles transient failures gracefully.