ACorrect
Amazon EBS - persistent block storage attached to an EC2 instance.
Correct. Amazon EBS is persistent block storage attached to an EC2 instance, used for the OS or database data area.
Which combinations of an AWS storage service and its characteristics are correct? (Choose TWO.)
1 / 1
Select all that apply
CorrectA, D
Explanation
A question about choosing the two correct combinations of storage services and their characteristics.
- 1「AWS storage service and its characteristics」Correctly match the characteristics of EBS/EFS/S3/Snow Family
BIncorrect
Amazon S3 - block storage mounted directly as the OS boot disk of an EC2 instance.
The block storage used as the OS boot disk of an EC2 instance is EBS.
S3 is object storage, so this description is wrong, and it is incorrect.
CIncorrect
Amazon S3 Glacier - storage for frequently accessed data that requires millisecond access.
Amazon S3 Glacier is a low-cost storage class for long-term retention and archiving.
It is designed so that retrieval takes time and incurs retrieval fees, and it is not a place for frequently accessed data, so this combination is incorrect.
DCorrect
Amazon EFS - a managed file system that multiple Linux EC2 instances can share simultaneously.
Correct. Amazon EFS is a managed NFS file system that multiple Linux EC2 instances can mount and share simultaneously, and its capacity scales automatically.
EIncorrect
Amazon EFS - block storage attached to a single EC2 instance for its exclusive use.
Amazon EFS is a shared file system that multiple EC2 instances can mount simultaneously.
'Block storage attached to a single instance for exclusive use' is a characteristic of EBS, and it is wrong as a description of EFS, so it is incorrect.
Key Takeaway
Mapping: EBS = block (attached to EC2) / EFS = shared file system / S3 = object / Glacier = long-term archive. Watch out for distractors that swap the characteristics.