Multi-region architecture patterns in GCP - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Active-Active Multi-Region Setup

In a multi-region architecture, what is the main advantage of an active-active setup compared to active-passive?

A It allows traffic to be served from multiple regions simultaneously, improving availability and reducing latency.

B It keeps one region completely offline until a failure occurs in the primary region.

C It requires manual failover to switch traffic between regions.

D It stores data only in one region to avoid replication delays.

💡 Hint

Think about how traffic is handled in both setups.

Active-active means multiple regions serve traffic at the same time, improving availability and latency. Active-passive keeps one region idle until failover.

❓ Architecture

intermediate

Choosing Data Replication Strategy

You want to design a multi-region system on GCP that keeps data consistent across regions with minimal delay. Which replication strategy fits best?

A Synchronous replication, where writes are confirmed only after all regions have the data.

B Asynchronous replication, where data is copied after the write is acknowledged.

C No replication, data is stored only in the primary region.

D Manual data export and import between regions daily.

💡 Hint

Consider consistency and delay trade-offs.

Synchronous replication ensures data is consistent across regions by confirming writes only after all regions have the data, minimizing inconsistency but may add latency.

❓ service_behavior

advanced

Impact of DNS Failover in Multi-Region Setup

In a multi-region architecture using DNS failover, what is a common limitation affecting failover speed?

A DNS failover only works if regions share the same IP address.

B DNS automatically detects region health instantly and switches traffic immediately.

C DNS failover requires manual intervention to update IP addresses.

D DNS caching by clients and resolvers can delay traffic switching to the healthy region.

💡 Hint

Think about how DNS caching works on the internet.

DNS caching by clients and resolvers can cause delays in failover because cached IP addresses may still point to the failed region until the cache expires.

❓ security

advanced

Securing Data in Multi-Region Replication

Which practice best secures data replicated across multiple GCP regions?

A Store data unencrypted to speed up replication.

B Encrypt data at rest and in transit using managed encryption keys.

C Use the same encryption key without rotation for all regions indefinitely.

D Disable network security to allow faster data transfer between regions.

💡 Hint

Consider encryption best practices for cloud data.

Encrypting data at rest and in transit with managed keys protects data confidentiality and integrity during replication across regions.

✅ Best Practice

expert

Designing for Disaster Recovery in Multi-Region Architecture

Which design choice best supports fast disaster recovery with minimal data loss in a multi-region GCP architecture?

A Use asynchronous replication with manual failover and no health monitoring.

B Rely on client-side retries to handle region failures without failover.

C Use synchronous replication with automated failover and health checks between regions.

D Keep backups only in the primary region and restore manually after failure.

💡 Hint

Think about automation and replication consistency for recovery speed.

Synchronous replication combined with automated failover and health checks enables quick recovery with minimal data loss by switching traffic automatically to a healthy region.