EFS

Question 1

Which AWS service provides scalable, elastic, concurrent (with some restrictions), and encrypted file storage for use with both AWS services and on-premises resources?

Answer 1

Elastic File System (EFS) - implements NFSv4

Question 2

What is the resiliency posture of the EFS service?

Answer 2

EFS is a region-resilient service

Question 3

Can EFS be used with Windows systems?

Answer 3

No, EFS can only be mounted on Linux-based systems, including EC2 instances

Question 4

How do other services access the EFS service?

Answer 4

EFS is isolated to the VPC in which it is provisioned and is accessed through mount targets located in subnets within the VPC, these mount targets have IP addresses

Question 5

How can the EFS service be accessed from on-premises systems?

Answer 5

EFS can be accessed from on-premises systems via VPN Connection, or Direct Connect

Question 6

What family of standards is specified by the IEEE Computer Society, for maintaining compatibility between operating systems (the interface that Linux-based systems understand)?

Answer 6

Portable Operating System Interface (POSIX)

Question 7

What are the two performance modes available in EFS?

Answer 7

• General Purpose (default, used 99% of the time): Suitable for latency-sensitive use cases, such as web servers, content management, and general file serving
• Max I/O: Designed for high throughput and IOPS but may have increased latency, ideal for big data, media processing, and scientific analysis (parallel computing workloads)

Question 8

What are the two throughput modes available in EFS?

Answer 8

• Bursting Throughput: Similar to gp2 EBS volumes, throughput scales with EFS size
• Provisioned Throughput: Throughput can be specified independently of EFS size

Question 9

What are the two storage classes available in EFS?

Answer 9

• Standard (default): For storing frequently accessed data
• Infrequent Access: For storing infrequently accessed data

Question 10

What is the ideal use case for the Amazon EFS service?

Answer 10

• Web serving and content management
• Enterprise applications
• Media and entertainment
• Home directories
• Database backups
• Developer tools
• Container storage
• Big data analytics

Question 11

How can high availability be achieved with Amazon EFS?

Answer 11

By placing mount targets in multiple AZs

Question 12

What are the supported options for mounting Amazon EFS using the EFS mount helper?

Answer 12

• Mount on supported EC2 instances
• Mount with IAM authorization
• Mount with Amazon EFS access points
• Mount from an on-premises Linux client
• Auto-mount on EC2 instance reboot
• Mount on EC2 instance launch

Question 13

How to enforce creation of only encrypted-at-rest Amazon EFS file systems?

Answer 13

Use the elasticfilesystem:Encrypted IAM condition key in identity-based policies

Question 14

What types of access control can Amazon EFS access points enforce?

Answer 14

• User identity, including POSIX groups, for all requests
• Custom root directory to limit access to a specific directory and its subdirectories