EC2

Question 1

How to connect to EC2 instances in private subnet ?

Answer 1

Configure a bastion host in the public subnet and ssh into it. Then ssh to the backend instance from the bastion

Question 2

How to create Instances with software pre-installed ? (2)

Answer 2

. Add the script for the installation in the User data section
. Create an AMI and then create a launch configuration

Question 3

How to secure the data in EBS volume ?

Answer 3

encrypt the data using KMS

Question 4

Type of EBS ?
. Low latency
. Development and test environments
. Balance of price and performance.

Answer 4

General purpose SSD

Question 5

Type of EBS ?
High performance for mission critical 
Low latency 
Sustained IOPS performance
More than 64 000 IOPS

Answer 5

Provisioned IOPS SSD

Question 6

Type of EBS ? 
. Big data, data warehouses, log processing
. Low-cost 
. Frequently accessed 
. Throughput intensite workloads

Answer 6

throughput optimized HDD

Question 7

Type of EBS ?
. Lowest cost
. Designed for less frequently accessed workloads

Answer 7

Cold HDD

Question 8

Type of EC2 instance ?
. Development/testing cases where you are not certain about the best EC2 instance to use for an application
. cannot be interrupted, short-term use, highly variable, or unpredictable

Answer 8

On demand

Question 9

Type of EC2 instance ?
. Application that is tolerant of potential interruption/failure,
. Using those instances has the potential for providing substantial cost savings (up to 90% than others)
. Useful to scale up an application that suddenly needs a great deal more compute capacity

Answer 9

Spot instance

Question 10

Type of EC2 instance ?
. Reduce costs by making 1 or 3 year commitment to a consistent amount of usage (don’t support RDS)
. Used if you know your applications’ workload profiles

Answer 10

savings plans

Question 11

. Reduce costs by making 1 or 3 year commitment to a consistent amount of usage (don’t support RDS)
. Used if you know your applications’ workload profiles
. Assigned to a specific AZ

Answer 11

Reserved instance

Question 12

Instance metadata vs user data ?

Answer 12

Instance metadata is data use to configure or manage the running instance. for example, host name, events, and security groups.

User Data specified by the user, for example, you added a new bucked, its unique bucked name will be part of user data.

Question 13

Random High rate read and writes
Works with SQL & NoSQL
“intensive read/write and consistent” for IO

Answer 13

Provisioned IOPS SSD

Question 14

the most cost-effective EBS storage option

Answer 14

Throughput Optimized HDD

Question 15

Storing of settings such as AMI ID, instance type, key pairs and Security Groups

Answer 15

EC2 launch template

Question 16

What is the default limit of EC2 per region ?

Answer 16

20 instances

Question 17

Where are stored Ip addresses, instance ID, public keys and network interfaces for EC2 ?

Answer 17

store in the metadata of EC2 instance

Question 18

small and random I/O operations, SSD or HDD ?

Answer 18

SSD

Question 19

SSD vs HDD, which is the cheapest ?

Answer 19

HDD

Question 20

Best for transactional workloads , SSD or HDD ?

Answer 20

SSD

Question 21

Can be used as a bootable volume, SSD or HDD ?

Answer 21

SSD

Question 22

How to remotely and securely manage the configuration of your managed instances ?

Answer 22

Systems Manager Run Command