Question 1

Which statement about Amazon EC2 Auto Scaling is accurate?

It can launch Amazon EC2 instances, but customers must terminate instances after they are no longer needed.
It can launch Amazon EC2 instances in multiple Availability Zones.
It requires the customer to use Reserved Instances only.
It can launch new Amazon EC2 instances based on a schedule.

Amazon EC2 Auto Scaling can launch instances in multiple Availability Zones, which increases overall reliability for an implementation.

Question 2

A devops engineer detected that the demand on a fleet of Amazon EC2 instances in an Auto Scaling group increases by a set amount on weekend days. Which type of scaling is the MOST appropriate in this case?

Manual
Dynamic
Scheduled
Predictive

Question 3

A devops engineer launches a fleet of Amazon EC2 instances in an Auto Scaling group behind an Application Load Balancer. The EC2 instances must maintain 50 percent average CPU utilization. Which type of scaling is appropriate to use based on CPU utilization usage?

Step scaling
Manual scaling
Simple scaling
Target tracking scaling

Target tracking scaling provides the average CPU utilization as a standard target metric. A user can specify the target value and let Amazon EC2 Auto Scaling handle the rest.

Question 4

How can a user vertically scale an Amazon RDS database?

By creating dedicated read and write nodes
By adding read replicas
By changing the instance class or size
By sharding the database

Question 5

How can an AWS customer horizontally scale an Amazon Aurora database?

By creating a scaling policy
By adding Aurora Replica instances by using Aurora Auto Scaling
By creating Amazon CloudWatch alarms
By changing the instance type

An Aurora cluster consists of a primary Aurora DB instance and one or more Aurora Replicas. It is possible to scale horizontally by adding read replicas using Aurora Auto Scaling.

Question 6

How does Amazon DynamoDB perform automatic scaling?

It adjusts the provisioned throughput capacity in response to traffic patterns.
It adds read replicas in response to increased read demand.
It changes the instance type in response to changes in processing load.
It adds and removes database instances in response to changes in traffic.

DynamoDB provisioned mode uses Amazon CloudWatch and AWS Application Auto Scaling to adjust the provisioned throughput capacity of a table within minimum and maximum limits. DynamoDB on-demand mode scales a table based on actual reads and writes without any limits.

Question 7

A fleet of Amazon EC2 instances is launched in an Amazon EC2 Auto Scaling group. The instances run an application that uses a custom protocol on TCP port 42000. Connections from client systems on the internet must balance across the instances. Which load balancing solution is the best solution?

Application Load Balancer
Gateway Load Balancer
Classic Load Balancer
Network Load Balancer

A Network Load Balancer can handle TCP, UDP, and TLS network traffic protocols. As a feature of Elastic Load Balancing (ELB), a Network Load Balancer is highly available.

Question 8

A company must build a highly available website that uses server-side scripts to serve dynamic HTML. Which solution provides the HIGHEST availability for the LEAST cost and complexity?

The customer deploys a second web server in another Region. Amazon Route 53 uses failover routing for disaster recovery (DR).
Amazon S3 hosts the website. DNS name resolution points to the S3 bucket.
An Auto Scaling group launches Amazon EC2 instances, which are served by a Network Load Balancer. Amazon Route 53 uses latency-based routing.
An Auto Scaling group launches Amazon EC2 instances, which are served by an Application Load Balancer. DNS name resolution points to the load balancer.

The Auto Scaling group can automatically launch instances to handle increased load and can terminate instances when they become unhealthy or when the load decreases. The Application Load Balancer is highly available and distributes the load across the instances.

Question 9

Users in location A connect to an application in Region A. Users in location B connect to the same application in Region B. If the application in Region A becomes unhealthy, traffic for location A must be redirected to the application in Region B. Which solution meets this requirement?

Use geolocation routing with failover records in Amazon Route 53.
Use geoproximity routing and a Network Load Balancer that is attached to both Regions.
Use latency-based routing in Amazon Route 53 with Amazon CloudWatch alarms.
Use an Application Load Balancer with Amazon CloudWatch alarms.

Geolocation routing enables the separation of traffic based on location. A failover record that points to the application in Region B enables failover if the application in Region A becomes unhealthy.

Question 10

A software engineer has created an AWS account for their own personal development and testing. They want the account to stay within the AWS Free Tier and to not generate unexpected costs. Which approach will work and will require the LEAST effort?

Create a service control policy (SCP) to restrict all services that are not included in the AWS Free Tier.
Create an Amazon CloudWatch alarm to send an email message when the account billing exceeds $0.
Create an Amazon CloudWatch metric to monitor account billing and limit it to $0.
Sign in to the AWS Management Console each month and check the billing dashboard.

Create an alarm for the estimated charges and receive a notification when the estimated charges exceed the AWS Free Tier limit.

CLD120 Module 10 Knowledge Check

Implementing Monitoring, Elasticity, and High Availability

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