AWS ECS

Question 1

What is the difference between EC2 and EBS volumes

Answer 1

EC2s are virtual machines that you rent, EBS volumes are virtual drives

Question 2

What is it called when you bootstrap your instance (launching a command on startup)

Answer 2

User Data

Question 3

What must you have if you want to manipulate an instance through SSH?

Answer 3

Key-Pair

Question 4

You’ve stopped and started an instance, which IP address will change, the private or public?

Answer 4

Public

Question 5

An instance name has which 3 following parameters

Answer 5

type, version, size within instance class ; i.e. m5.2xlarge

Question 6

What 4 types of instance types do you have

Answer 6

General, Compute, Memory, Storage

Question 7

You are working on an application with a large database, data warehousing, and distributed file systems. You need high sequential read/write access to these large datasets. Which instance type should you use?

Answer 7

Storage

Question 8

What EC2 feature behaves like the firewall for an EC2 instance

Answer 8

Security Groups

Question 9

Security groups have allow, or deny rules?

Answer 9

Allow

Question 10

Security Groups regulate what?

Answer 10

port access, authorized IP ranges, inbound/outbound traffic

Question 11

True or False, Security Groups can be attached to multiple instances

Answer 11

True

Question 12

You’ve gotten a timeout where you are stuck on the loading page, what is the issue

Answer 12

security group

Question 13

How could you easily get two instances to share information?

Answer 13

Put them in the same security group

Question 14

What are the 7 Instance purchasing options?

Answer 14

on Demand, Reserved, Savings Plan, Spot Instances, Dedicated Host, Dedicated Instances, Capacity Reservations

Question 15

What is the difference between the Dedicated Hosts and Dedicated Instances savings plan

Answer 15

Hosts are booking physical servers, Dedicated Instances allow customers to not share hardware with others

Question 16

You know what your usage, workload will be for the next 1 or 3 years, which plan should you go for?

Answer 16

Savings Plan

Question 17

Which Instance Purchasing Option is the MOST cost effective?

Answer 17

Spot Instances

Question 18

Should you use Spot Instances for databases?

Answer 18

No

Question 19

You have a short term application you need to run with an uninterrupted workload and remain in a specific AZ. Which purchasing option should you go with?

Answer 19

Capacity Reservations

Question 20

What is a Spot Fleet

Answer 20

a set of Spot Instances and optional on demand instances

Question 21

How do you have your public IPv4 from changing when you stop/start an instance?

Answer 21

Use an Elastic IP

Question 22

What are the 3 Placement Group types

Answer 22

Cluster, Spread, and Partition

Question 23

You need a low latency option for your application, what Placement Group should you choose?

Answer 23

Cluster

Question 24

Why would you want to use a Spread Placement Group

Answer 24

You need to minimize failure risk, all EC2 instances will be on different hardware and span across AZs

Question 25

What is the EC2s virtual version of a network card? This provides the EC2 with network connectivity

Answer 25

ENI (Elastic Network Interface)

Question 26

You can create an ENI without attaching it to an EC2 instance True or False?

Answer 26

True

Question 27

What mode can you put the EC2 instance into to preserve RAM and boot back up much faster?

Answer 27

Hibernate

Question 28

ENIs and EC2s must be in the same AZ True or False?

Answer 28

True