Answer: Create an Amazon Route 53 multivalue answer routing policy., Launch four EC2 instances: two instances in one Availability Zone and two instances in another Availability Zone.

## Explanation **Correct Answers:** C and E **Why C (Route 53 multivalue answer routing policy) is correct:** - The multivalue answer routing policy returns multiple values (IP addresses) in random order to the client - It performs health checks on each resource and only returns healthy instances - This ensures traffic reaches all running EC2 instances randomly as required - If an instance fails health checks, it's automatically removed from the response **Why E (Launch four EC2 instances across two Availability Zones) is correct:** - For high availability and fault tolerance, instances should be distributed across multiple Availability Zones - Having two instances in each of two AZs provides redundancy at the AZ level - If one AZ fails, the other AZ can continue serving traffic - Four instances provide better load distribution than three **Why other options are incorrect:** - **A (Route 53 failover routing policy):** This is for active-passive failover scenarios, not for random traffic distribution to all instances - **B (Route 53 weighted routing policy):** This distributes traffic based on assigned weights, not randomly to all instances - **D (Three EC2 instances with uneven distribution):** While better than single AZ, having only one instance in the second AZ creates a single point of failure in that AZ **Key Architecture Principles:** 1. **High Availability:** Achieved by distributing instances across multiple Availability Zones 2. **Fault Tolerance:** Achieved by having redundant instances in each AZ 3. **Random Traffic Distribution:** Achieved using Route 53 multivalue answer routing policy 4. **Health Monitoring:** Route 53 health checks ensure only healthy instances receive traffic

Author: LeetQuiz Editorial Team