AWS Certified Solutions Architect - Associate
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A company wants to migrate two DNS servers to AWS. The servers host a total of approximately 200 zones and receive 1 million requests each day on average. The company wants to maximize availability while minimizing the operational overhead that is related to the management of the two servers.
What should a solutions architect recommend to meet these requirements?
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UAnonymous
A
Create 200 new hosted zones in the Amazon Route 53 console Import zone files.
B
Launch a single large Amazon EC2 instance Import zone tiles. Configure Amazon CloudWatch alarms and notifications to alert the company about any downtime.
C
Migrate the servers to AWS by using AWS Server Migration Service (AWS SMS). Configure Amazon CloudWatch alarms and notifications to alert the company about any downtime.
D
Launch an Amazon EC2 instance in an Auto Scaling group across two Availability Zones. Import zone files. Set the desired capacity to 1 and the maximum capacity to 3 for the Auto Scaling group. Configure scaling alarms to scale based on CPU utilization.
Explanation:
Explanation
Correct Answer: A - Create 200 new hosted zones in the Amazon Route 53 console Import zone files.
Why this is the correct answer:
-
Maximize Availability: Amazon Route 53 is a highly available and scalable DNS service with a 100% availability SLA. It automatically distributes DNS queries across multiple AWS regions and Availability Zones, providing better availability than self-managed DNS servers.
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Minimize Operational Overhead: Route 53 is a fully managed service, eliminating the need for:
- Managing EC2 instances
- Configuring Auto Scaling groups
- Setting up monitoring and alarms
- Patching and maintaining operating systems
- Managing DNS server software
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Scalability: Route 53 can easily handle 1 million requests per day (which is approximately 11.6 queries per second) and can scale to handle billions of queries per day.
-
Zone Management: Route 53 supports importing zone files, making migration straightforward for the 200 zones.
Why the other options are incorrect:
B. Launch a single large Amazon EC2 instance:
- Single point of failure (not highly available)
- Requires ongoing operational overhead (patching, monitoring, scaling)
- Doesn't maximize availability
C. Migrate the servers using AWS SMS:
- This simply lifts and shifts the existing DNS servers to EC2
- Doesn't reduce operational overhead
- Doesn't maximize availability (still self-managed servers)
D. Launch EC2 instance in Auto Scaling group:
- While better than option B (with Auto Scaling across AZs), it still requires:
- Managing EC2 instances
- Configuring and maintaining Auto Scaling policies
- Managing DNS software
- Operational overhead for monitoring and maintenance
- Route 53 is a fully managed service that provides better availability with less operational overhead.
Key AWS Services Mentioned:
- Amazon Route 53: AWS's scalable DNS web service
- AWS Server Migration Service (AWS SMS): Service for migrating on-premises servers to AWS
- Amazon EC2 Auto Scaling: Service for automatically scaling EC2 instances
- Amazon CloudWatch: Monitoring and observability service
Best Practice: When migrating DNS services to AWS, Route 53 is the recommended solution for maximizing availability and minimizing operational overhead, as it's a fully managed service with built-in high availability and scalability.
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