EC2

Question 1

What is the maximum number of EC2 instances that can be attached to a EBS Multi-Attach volume (io family)

Answer 1

16

Question 2

What is EBS Multi-Attach?

Answer 2

A feature that lets you attach one io1 or io2 EBS volume to multiple EC2 instances in the same availability zone

Question 3

Can you use EBS Multi-Attach to attach volumes across availability zones?

Answer 3

No

Question 4

What is the EBS Instance Store?

Answer 4

Short-lived (ephemeral) storage available on the same host as a running EC2 instance. Ideal for cached data or scratch areas.

Question 5

What is an AMI?

Answer 5

Amazon Machine Image

Question 6

What EBS volume type has the highest performance?

Answer 6

io1 & io2 block express

Question 7

What is the general purpose SSD EBS volume type?

Answer 7

gp2 & gp3

Question 8

What EBS volume type is best for less frequently accessed data?

Answer 8

sc1 (HDD)

Question 9

What EBS volume types can be used as boot volumes?

Answer 9

gp2, gp3, io1 & io2 (any SSD)

Question 10

What is the best EBS volume type for database workloads that require high performance?

Answer 10

io1 or io2

Question 11

What is EFS?

Answer 11

Elastic File System - managed network file system that can be mounted on many EC2 instances across availability zones. Is about 3x more expensive than gp3

Question 12

What is a use case of EFS?

Answer 12

Content management, web serving, data sharing

Question 13

How is access to an EFS managed?

Answer 13

A security group

Question 14

What operating systems can EFS be used with?

Answer 14

Linux based only

Question 15

What are the two main storage tiers for EFS?

Answer 15

Standard (for frequently accessed files) and Infrequent Access. A policy can be created to automatically move files to the IA tier to help save money

Question 16

Can you configure a EFS for just one AZ (availability zone)?

Answer 16

Yes, this could be useful for development compared to production

Question 17

What are the three main throughput modes for EFS?

Answer 17

Enhanced Elastic (best for workloads with unpredictable IO). Bursting (throughput scales with amount of storage). Provisioned (best when you can estimate workload in advance).

Question 18

What does EBS stand for?

Answer 18

Elastic Block Storage

Question 19

How do you migrate an EBS volume across AZ?

Answer 19

Take a snapshot, restore the snapshot to another AZ

Question 20

Can you use an AMI from one region to create an instance in a different region?

Answer 20

No

Question 21

You are running a high-performance database that requires an IOPS of 310,000 for its underlying storage. What do you recommend?

Answer 21

EC2 Instance Store (because io2 has a max IOS of about 250,000)

Question 22

Which EC2 Purchasing Option can provide you the biggest discount, but it is not suitable for critical jobs or databases? Dedicated hosts, Spot instances or Convertible reserved instances?

Answer 22

Spot instances

Question 23

How long can you reserve an EC2 Reserved Instance?

Answer 23

1 OR 3 years

Question 24

What is IMDS?

Answer 24

Instance MetaData Service

Question 25

How can you use MFA with the AWS CLI?

Answer 25

Call the STS GetSessionToken API

Question 26

What happens if you don’t specify or configure a default region when using the AWS SDK?

Answer 26

us-east-1 will be chosen by default