AWS Certified Solutions Architect - Associate
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A company recently migrated its web application to AWS by rehosting the application on Amazon EC2 instances in a single AWS Region. The company wants to redesign its application architecture to be highly available and fault tolerant. Traffic must reach all running EC2 instances randomly.
Which combination of steps should the company take to meet these requirements? (Choose two.)
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UAnonymous
A
Create an Amazon Route 53 failover routing policy.
B
Create an Amazon Route 53 weighted routing policy.
C
Create an Amazon Route 53 multivalue answer routing policy.
D
Launch three EC2 instances: two instances in one Availability Zone and one instance in another Availability Zone.
E
Launch four EC2 instances: two instances in one Availability Zone and two instances in another Availability Zone.
Explanation:
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:
- High Availability: Achieved by distributing instances across multiple Availability Zones
- Fault Tolerance: Achieved by having redundant instances in each AZ
- Random Traffic Distribution: Achieved using Route 53 multivalue answer routing policy
- Health Monitoring: Route 53 health checks ensure only healthy instances receive traffic
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