A company is running big data analytics and massive parallel computations on its AWS test and development servers. The company can tolerate occasional downtime.
What is the MOST cost-effective Amazon EC2 purchasing option for the company to use?
A. On-Demand Instances
B. Spot Instances
C. Reserved Instances
D. Savings Plans
Show Answer
Correct Answer: B
Explanation: Spot Instances offer the lowest EC2 pricing and are ideal for fault-tolerant workloads like big data analytics and parallel computations where occasional interruptions are acceptable. On-Demand, Reserved Instances, and Savings Plans cost more and are better suited for steady or interruption-sensitive workloads.
Question 12
Which design principles are included in the reliability pillar of the AWS Well-Architected Framework? (Choose two.)
A. Automatically recover from failure.
B. Grant everyone access to increase AWS service quotas.
C. Stop guessing capacity.
D. Design applications to run in a single Availability Zone.
E. Plan to increase AWS service quotas first in a secondary AWS Region.
Show Answer
Correct Answer: A, C
Explanation: The Reliability pillar design principles include automatically recovering from failure and stopping the need to guess capacity. These principles focus on building systems that can adapt to change, handle failures through automation, and scale appropriately without manual capacity planning. The other options do not align with the stated Reliability design principles.
Question 13
A company is planning to use the Amazon EC2 instances as web servers. Customers from around the world will use the web servers. Most customers will use the web servers only during certain hours of the day.
How should the company deploy the EC2 instances to achieve the LOWEST operational cost?
A. In multiple Availability Zones
B. In an Auto Scaling group
C. In a placement group
D. In private subnets
Show Answer
Correct Answer: B
Explanation: Using an Auto Scaling group allows the company to automatically scale the number of EC2 instances up during peak usage hours and scale them down during off-peak hours. This ensures customers are served when demand is high while minimizing the number of running instances when demand is low, resulting in the lowest operational cost compared to fixed deployments across Availability Zones, placement groups, or private subnets.
Question 14
A company is using multiple AWS accounts for different business teams. The finance team wants to receive one bill for all of the company's accounts.
Which AWS service or tool should the finance team use to meet this requirement?
A. AWS Organizations
B. AWS Trusted Advisor
C. Cost Explorer
D. AWS Budgets
Show Answer
Correct Answer: A
Explanation: AWS Organizations provides consolidated billing, allowing multiple AWS accounts to be grouped so the finance team receives a single bill while still maintaining separate accounts for different teams.
Question 15
Which AWS service provides serverless compute for use with containers?
A. Amazon Simple Queue Service (Amazon SQS)
B. AWS Fargate
C. AWS Elastic Beanstalk
D. Amazon SageMaker
Show Answer
Correct Answer: B
Explanation: AWS Fargate is a serverless compute engine specifically designed to run containers without requiring users to manage servers or clusters. The other options do not provide serverless container compute: SQS is a messaging service, Elastic Beanstalk is a PaaS that still manages underlying resources, and SageMaker is focused on machine learning.
Question 16
A company uses Amazon RDS for a product database. The company wants to ensure the database is highly available.
Which feature of Amazon RDS will meet this requirement?
A. Read replicas
B. Blue/green deployment
C. Multi-AZ deployment
D. Reserved Instances
Show Answer
Correct Answer: C
Explanation: Multi-AZ deployment provides high availability by automatically provisioning and maintaining a synchronous standby replica in a different Availability Zone, enabling automatic failover during outages. Read replicas are mainly for read scaling, blue/green deployments are for safer updates, and Reserved Instances are a pricing option.
Question 17
Which AWS services or features form the AWS Cloud global infrastructure? (Choose two.)
A. Availability Zones
B. Amazon ElastiCache
C. AWS Regions
D. Amazon S3
E. Amazon VPC
Show Answer
Correct Answer: A, C
Explanation: AWS global infrastructure is composed of AWS Regions and Availability Zones. Regions are separate geographic areas, and each Region contains multiple Availability Zones designed for fault isolation. The other options are AWS services that run on top of this infrastructure, not components of it.
Question 18
Which advantage of cloud computing allows users to scale resources up and down based on the amount of load that an application supports?
A. Go global in minutes
B. Stop guessing capacity
C. Benefit from massive economies of scale
D. Trade fixed expense for variable expense
Show Answer
Correct Answer: B
Explanation: The advantage that allows scaling resources up or down with application load is the ability to stop guessing capacity. Cloud services provide elastic scaling so resources can match actual demand instead of being provisioned in advance.
Question 19
Which guidelines are best practices for using AWS Identity and Access Management (IAM)? (Choose two.)
A. Share access keys.
B. Create individual IAM users.
C. Use inline policies instead of customer managed policies.
D. Grant maximum privileges to IAM users.
E. Use groups to assign permissions to IAM users.
Show Answer
Correct Answer: B, E
Explanation: IAM best practices include creating individual IAM users so actions can be audited and credentials are not shared, and using IAM groups to manage permissions efficiently and consistently. Sharing access keys, granting maximum privileges, and preferring inline policies over managed policies all violate the principle of least privilege and recommended IAM management practices.
Question 20
A company needs to host a web server on Amazon EC2 instances for at least 1 year. The web server cannot tolerate interruption.
Which EC2 instance purchasing option will meet these requirements MOST cost-effectively?
A. On-Demand Instances
B. Partial Upfront Reserved Instances
C. Spot Instances
D. No Upfront Reserved Instances
Show Answer
Correct Answer: B
Explanation: The workload must run continuously for at least 1 year and cannot tolerate interruption, which rules out Spot Instances. For long-term, steady-state usage, Reserved Instances are more cost-effective than On-Demand. Among Reserved Instance options, Partial Upfront Reserved Instances typically provide a lower total cost over the term than No Upfront Reserved Instances while still guaranteeing capacity and no interruptions. Therefore, Partial Upfront Reserved Instances are the MOST cost-effective choice.
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