TJ - Review mode set 4

Question 1

You pay for all bandwidth in/out of S3, except for 3 cases. List the 3 cases where you do NOT pay for bandwidth in/out of S3.

Answer 1

– Data transferred in from the Internet.

– Data transferred out to an Amazon EC2 instance, when the instance is in the same AWS Region as the S3 bucket (including to a different account in the same AWS region).

– Data transferred out to Amazon CloudFront.

Question 2

What is Lambda@Edge?

Answer 2

a feature of Amazon CloudFront that lets you run code closer to users of your application, which improves performance and reduces latency.

Question 3

What is AWS Health?

Answer 3

provides ongoing visibility into your resource performance and the availability of your AWS services and accounts

Question 4

In AWS Health, What is the difference between AWS PERSONAL Health Dashboard and AWS SERVICE Health Dashboard?

Answer 4

-Personal health is tailored to a specific AWS account.
-Service health provides a high-level overview of the health and status of AWS services across all regions. Has nothing to do with a specific AWS customer but alerts to anyone in the affected region

Question 5

What service is most “tightly coupled” with AWS Health?

Answer 5

AWS EventBridge

It is specifically designed to integrate with AWS Health events, providing real-time, automated responses to health issues.

Question 6

What is Eventbridge?

Answer 6

EventBridge is a versatile event bus service designed to integrate with numerous AWS services, such as Lambda, Step Functions, SNS, SQS, and more (cloudwatch, AWS health)

Question 7

In S3, how do you protect data in a bucket from an AZ wide or region wide failure?

Answer 7

Enable cross-region replication

Question 8

What is the charge for a stopped On-Demand EC2 instance?

Answer 8

there is no charge for a stopped EC2 instance that you have shut down.

Question 9

What is the behavior of EBS volumes on a stopped instance?

Answer 9

EBS volumes are off-instance storage that can keep information and continue to accrue charges even when an instance is stopped

Question 10

which SSE provides an audit trail that shows when your key was used and by whom?

-Server-Side Encryption with Amazon S3-Managed Keys (SSE-S3)
- Server-Side Encryption with Customer Master Keys (CMKs) Stored in AWS Key Management Service (SSE-KMS)
- Server-Side Encryption with Amazon S3-Managed Keys (SSE-S3)

Answer 10

• Server-Side Encryption with Customer Master Keys (CMKs) Stored in AWS Key Management Service (SSE-KMS)

Question 11

How do you collect logs from your Amazon EC2 instances and on-premises servers into CloudWatch?

Answer 11

unified CloudWatch agent, or the old CloudWatch Logs agent.

Question 12

what is the difference in SSM Agent and cloudwatch agent?

Answer 12

The SSM Agent is used for securely managing and configuring AWS resources, whereas the CloudWatch Agent is used for collecting and tracking metrics and logs from AWS resources.

Question 13

What is the behavior for standard SQS queues (The default) ?

Answer 13

SQS Standard Queues do not guarantee message order and may deliver duplicates.

Question 14

What is the behavior for FIFO SQS queues?

Answer 14

SQS FIFO Queues guarantee message order and ensure no duplicates are sent, making them suitable for scenarios where the order of processing and exactly-once delivery are crucial.

Question 15

List Example Use Cases for FIFO SQS:

Answer 15

-Order processing systems where the order of transactions must be preserved.
-Financial transactions that require exactly-once processing without duplicates.
-Task queues where tasks must be executed in the order they are received.

Question 16

List Example Use Cases for KDS:

Answer 16

-Real-time log and event data collection and analysis.
-Real-time data processing for analytics dashboards.
-Streaming data ingestion for IoT devices.
-AI training involving processing large volumes of data in real-time and requires high-throughput data ingestion