### AWS Certified Solutions Architect – Associate (SAA-C01) Exam Sample Questions Analysis
#### NO.1: Spot Instance Interruption Handling
**Question:** Which requirements must be met in order for a Solutions Architect to specify that an Amazon EC2 instance should stop rather than terminate when its Spot Instance is interrupted? (Choose two.)
**Answer:** C, D
- **C: The Spot Instance request type must be persistent.**
- **Explanation:** A persistent Spot Instance request allows the instance to remain running even if the Spot price exceeds the bid price. In this case, the instance will stop instead of terminating upon interruption, preserving data and state until it can be restarted.
- **D: The root volume must be an Amazon EBS volume.**
- **Explanation:** Using an Amazon Elastic Block Store (EBS) root volume ensures that the instance’s data is preserved during a stop/start operation. This is essential because the instance will need to be restarted with the same data after a Spot Instance interruption.
#### NO.2: Internet Accessibility from an EC2 Instance
**Question:** Your Amazon VPC has a public subnet with a route that sends all internet traffic to the internet gateway. An Amazon EC2 instance in the Public subnet has an assigned private IP address. The instance belongs to a security group set to allow all outbound traffic. The instance cannot access the internet. Why could the internet be unreachable from this instance?
**Answer:** D
- **D: The instance does not have a public IP address.**
- **Explanation:** For an EC2 instance to access the internet directly, it needs either a public IP address or an Elastic IP address. Without one of these, the instance cannot communicate with resources outside the VPC. Even though the subnet routes traffic to the internet gateway and the security group allows outbound traffic, without a public IP, the instance cannot initiate connections to external resources.
#### NO.3: Tracking Customer Session Data
**Question:** A company is rolling out a new web service but is unsure how many customers the service will attract. However, the company is unwilling to accept any downtime. What could a Solutions Architect recommend to the company in order to keep track of customers’ current session data?
**Answer:** A
- **A: Amazon DynamoDB**
- **Explanation:** Amazon DynamoDB is a fully managed NoSQL database service that provides fast and predictable performance with seamless scalability. It is suitable for storing session data due to its ability to handle large volumes of reads and writes with consistent, single-digit millisecond response times. Additionally, DynamoDB automatically scales to accommodate varying traffic patterns, making it ideal for services with uncertain traffic patterns like the one described.
#### NO.4: Collecting and Processing Sequential Page Clicks
**Question:** A company’s website receives 50,000 requests each second, and the company wants to use multiple applications to analyze the navigation patterns of the users on their websites so that the experience can be personalized. What can a Solutions Architect use to collect page clicks for the website and process them sequentially for each user?
**Answer:** D
- **D: Amazon Kinesis Stream**
- **Explanation:** Amazon Kinesis Streams is designed to handle real-time streaming data such as clickstreams, application logs, and IoT telemetry data. It enables the collection and processing of large streams of data records in real time. By using Kinesis Streams, the company can ingest and process the high volume of clickstream data, ensuring that each user’s interactions are processed in sequence. This is particularly useful for personalization algorithms that require a chronological understanding of user behavior.
#### NO.5: Leveraging AWS Services
**Question:** Although not fully presented, this question likely asks about leveraging AWS services to meet specific business needs.
**Possible Scenario:** A customer is leveraging AWS services to improve the scalability and performance of their applications while minimizing operational overhead.
**Recommendation:** Depending on the specific requirements, a Solutions Architect might recommend services such as:
- **AWS Lambda:** For serverless compute to handle spikes in traffic without managing servers.
- **Amazon S3:** For scalable and durable object storage to store static content and media files.
- **AWS CloudFormation:** For infrastructure as code, enabling the automatic creation and management of AWS resources.
- **AWS Auto Scaling:** To automatically adjust capacity to maintain steady, predictable performance at the lowest possible cost.
In conclusion, the AWS Certified Solutions Architect – Associate (SAA-C01) exam covers various aspects of designing and deploying scalable, reliable, and cost-effective systems using AWS services. Understanding the principles and practices outlined in these sample questions is crucial for passing the exam and effectively architecting solutions on AWS.
