Which persistent block storage attaches to a single EC2 instance, is used like a disk, and stores OS and database data?

1 / 1
Select an answer
CorrectB

Explanation

Question Overview

Choosing the persistent block storage that attaches to EC2.

Requirements to satisfy
  • 1「attaches to a single EC2 instance」Attached to an instance = EBS
  • 2「used like a disk」A characteristic of block storage
  • 3「persistent block storage」Data persists after stop = EBS
Per-option explanation
AIncorrect

Amazon S3

S3 is object storage that stores and retrieves files over HTTP.

It is not block storage that attaches to EC2 as a disk, so it is incorrect.

BCorrect

Amazon EBS

Correct. Amazon EBS (Elastic Block Store) is persistent block storage that attaches to an EC2 instance. It can be used like a local disk for OS boot volumes and database data. Data persists even when the instance is stopped.

CIncorrect

Amazon VPC

VPC is a service that provides a virtual network.

It is not block storage that attaches to EC2, so it is incorrect.

DIncorrect

AWS IAM

IAM is a service that manages access permissions.

It is not block storage that stores data, so it is incorrect.

Key Takeaway

'Attaches to EC2', 'disk', and 'block storage' point to Amazon EBS. Objects are S3, and a file system shared by multiple EC2 instances is EFS — distinguish them by type.

Related Links