EC2

Question 1

What is AMI?

Answer 1

An AMI (Amazon Machine Image) is a template that contains the software configuration (operating system, application server, and applications) required to launch an EC2 instance

Question 2

Permissions required on the private key (pem file)

Answer 2

0400

Question 3

Default policy for inbound traffic in a security groups

Answer 3

Deny all

Question 4

Default policy for outbound traffic in a security group

Answer 4

Allow all

Question 5

What is an Elastic IP?

Answer 5

a static public IPv4 IP designed for dynamic cloud computing.

Question 6

are Elastic IPs region specific or global?

Answer 6

region specific

Question 7

command used to start services in an Amazon Linux 2 machine

Answer 7

systemctl

Question 8

Whats bootstrapping?

Answer 8

Launching commands when the machine starts

Question 9

what user is used to run the bootstrap routine?

Answer 9

root

Question 10

What is the EC2 User data?

Answer 10

Data used to perform common automated configuration tasks and even run scripts after the . EC2 instance starts

Question 11

What types of used data can you pass to Amazon EC2?

Answer 11

shells scripts and cloud-init directives

Question 12

When are the user data scripts run?

Answer 12

By default they are only run during the boot cycle when you first launch an EC2 instance

Question 13

Where is the user data script copied to for execution?

Answer 13

it is copied to the directory /var/lib/cloud

Question 14

Why should you delete the user data script from the EC2 instance?

Answer 14

If you were to create an AMI from the EC2 instance and the user data was not deleted, then the script would be executed for every EC2 instance created from the resulting AMI

Question 15

You pay for an EC2 instance compute component only when it’s in “running” state or also when it is on “stopped” state?

Answer 15

Only when it is in “running” state

Question 16

Security Groups can reference all of the following except:

• IP address
• CIDR block
• Security Group
• DNS name

Answer 16

DNS name

Question 17

What security groups are locked down to?

• a region
• a vpc
• a region/vpc combination

Answer 17

a region/vpc combination

Question 18

What does EC2 stand for?

Answer 18

Elastic Compute Cloud

Question 19

EC2 Instance Purchasing Options

Answer 19

• On-demand instances
• Reserver Instances
• Scheduled Instances
• Spot instances
• Dedicated Hosts
• Dedicated Instances
• Capacity Reservations

Question 20

What is an on-demand instance?

Answer 20

it is an EC2 instance purchasing option where you pay bay the second for the instances that you launch

Question 21

Whats is a Reserved Instance?

Answer 21

EC2 instance purchasing option where you pay for a term from one to three years

Question 22

What is a Scheduled Instance?

Answer 22

EC2 instance purchasing option where the instance are always available on the specified recurring schedule, for a one-year term

Question 23

What is a Spot instance?

Answer 23

EC2 instance purchasing option where you request unused EC2 instances

Question 24

Whats a dedicated host?

Answer 24

EC2 instance purchasing option where you pay for a physical host that is fully dedicated to run you EC2 instances

Question 25

What is a dedicated instance?

Answer 25

EC2 instance purchasing option where you pay by the hour, for instances that run in a single-tenant hardware

Question 26

What is Capacity Reservation?

Answer 26

EC2 instance purchasing option where you reserve capacity for your EC2 instances in a specific Availability Zone for any duration

Question 27

EC2 R instance type

Answer 27

Instances for applications that need a lot of RAM - in memory caches

Question 28

EC2 C instance type

Answer 28

Instances for applications that need good CPU - compute/databases

Question 29

EC2 M instance type

Answer 29

Instances for applications that are balanced - general/web app

Question 30

EC2 I instance type

Answer 30

Instances for applications that need a good local I/O (instance storage) - databases

Question 31

EC2 G instance type

Answer 31

Instances for applications that need GPU - video rendering/machine learning

Question 32

EC2 T2/T3 Instance type

Answer 32

Burstable instances

Question 33

EC2 T2/T3 - unlimited instances type

Answer 33

Unlimited burst

Question 34

Are custom AMI available region-wise or globally?

Answer 34

Region-wise

Question 35

What type of placement groups there exist for EC2 instances?

Answer 35

Cluster and Spread

Question 36

Cluster placement group

Answer 36

• Have great network speed (10 Gb)
• All EC2 instances in a Cluster are in the same Rack (same hardware/Availability Zone)

Use cases:

• BigData job that needs to be completed fast
• Applications that need extremely low latency and high network throughput

Question 37

Spread placement group

Answer 37

• All EC2 instances are located in different hardware
• Can span across multiply Availability Zones
• Reduced risk of simultaneous failure
• Limited to 7 instances per AZ per placement group

Use case:

• Application that needs to maximize high availability
• Cassandra Cluster, Kafka, Clustered Web Application that is distributed

Question 38

EC2 instances that can not be instantiated in a placement group

Answer 38

T2

Question 39

Difference between Cluster and Spread placement groups

Answer 39

Clusters

• have great network speed (10 Gb)
• All EC2 instances in a Cluster are in the same Rack (same hardware/Availability Zone)