Exam 4

Question 1

How would you gradually introduce a new Lambda version by routing 10% of the incoming traffic away from the older version?

Answer 1

Lambda Aliases

Question 2

What protocols does an ALB support?

Answer 2

HTTP and Websocket

Question 3

How would you track CPU utilization of EC2 instances that evaluate as frequently as every 10 seconds?

Answer 3

Create a high resolution custom metric and push the data using cron

Question 4

What is the total size of the set of AWS Lambda environment variables you can create?

Answer 4

4KB

Question 5

What deployment strategy would you use if you choose to stop instances and install the new application version?

Answer 5

In place deployment

Question 6

What deployment strategy would you use if you choose to reroute traffic from your applications original environment to the new environment?

Answer 6

Blue/Green

Question 7

Do EBS volumes support in flight encryption?

Answer 7

Yes

Question 8

What 2 services rely on CloudFormation to provision resources?

Answer 8

• Step Function

- Elastic Beanstalk

Question 9

What does the PutMetricData API allow you to do?

Answer 9

It allows you to publish Custom Metrics down to 1-second resolution

Question 10

How would you allow auto-scaling based on metrics based on CPU utilization and incoming network traffic?

Answer 10

Create a Custom Metric in Cloudwatch and make your instances send data to it using PutMetricData. Create an alarm based on that metric.

Question 11

What is the max SQS message retention?

Answer 11

14 days

Question 12

What is the default SQS message retention?

Answer 12

4 days

Question 13

If your API’s resources receive requests from a domain other than the API’s own domain and you want to restrict servicing these requests, what should you do?

Answer 13

Restrict CORS

Question 14

How should you do to connect your AWS Lambda function to your RDS instance?

Answer 14

Deploy in a VPC and assign a security group

Question 15

How would you send email notifications every time someone comments on a pull request for AWS CodeCommit

Answer 15

Cloudwatch Event Rules

Question 16

What period can you specify if you set an alarm on a high-resolution metric?

Answer 16

10 seconds or 30 seconds

Question 17

What period can you specify if you set an alarm on a regular metric?

Answer 17

any multiple of 60 seconds

Question 18

If you do not select a region when first using AWS, what region will you be assigned to?

Answer 18

us-east-1

Question 19

What deployment strategy would you use if you want to be able to quickly rollback any failed deployments, and cost is not a problem?

Answer 19

Immutable: Immutable deployments perform an immutable update to launch a full set of new instances running the new version of the application in a separate Auto Scaling group, alongside the instances running the old version

Question 20

If you have an IAM user that has 2 policies attached, one to allow EC2 actions, and one to deny EC2 actions, what will happen when the user attempts an EC2 action?

Answer 20

The user will get denied because the policy has an explicit deny. Deny overrides allow.