AWS Fundamentals

Question 1

Is S3 a public or private service?

Answer 1

Public

Question 2

Are VPCs isolated by default?

Answer 2

Yes

Question 3

What are the types of network zones available in AWS?

Answer 3

1. AWS Public zone
2. AWS private zone

Question 4

What are the 2 types of AWS deployment?

Answer 4

1. AWS Regions (full deployment of AWS infrastructure: N. Virginia, London, …)
2. AWS Edge Locations (smaller than regions, but in more number than regions. Only have content distribution services and some edge computing)

Question 5

What defines an AWS Region?

Answer 5

1. Geographic separation - isolated fault domain
2. Geopolitical Separation - different governance
3. Location Control - performance

Question 6

What are AZ (Availability Zones)?

Answer 6

Isolated infrastructure inside a region (can exist 2 or more AZ per region).

Question 7

What are 2 globally resilient AWS services?

Answer 7

IAM and Route53

Question 8

What is the use of VPC?

Answer 8

VPC, aka Virtual Private Cloud, is used to create private networks inside AWS.

Question 9

Can I have the same VPC for more than 1 account and/or region?

Answer 9

No. A VPC is within 1 account and 1 region.

Question 10

What are the 2 types of VPCs available?

Answer 10

1. Default VPC (maximum 1 per region).
2. Custom VPC (many per region).

Question 11

What is a VPC CIDR?

Answer 11

Is a range of IP addresses allocated to a VPC.

Question 12

What is the VPC CIDR of the Default VPC?

Answer 12

172.31.0.0/16

Question 13

How are VPC CIDR subnets are allocated for each Availability Zone?

Answer 13

Example:
1. us-east-2a: 172.31.0.0/20
2. us-east-2b: 172.31.16.0/20
3. us-east-2c: 172.31.32.0/20

Question 14

What is IGW?

Answer 14

Internet Gateway

Question 15

What is SG?

Answer 15

Security Group

Question 16

What is NACL?

Answer 16

Network ACL

Question 17

Do Default VPCs have subnets assign public IPv4 addresses?

Answer 17

Yes.

Question 18

What is EC2?

Answer 18

Elastic Compute Cloud. Provides access to virtual machines, known as instances.

Question 19

Is EC2 public or private service by-default?

Answer 19

Private. It uses VPC networking.

Question 20

What means AZ Resilient?

Answer 20

It means that instance fails if AZ fails.

Question 21

How is EC2 billed?

Answer 21

On-Demand Billing, per second

Question 22

What are the types of storage supported by EC2?

Answer 22

1. Local on-host storage
2. Elastic Block Store (EBS)

Question 23

Do you have storage billing charges when your EC2 instance is stopped?

Answer 23

Yes.

Question 24

What is AMI?

Answer 24

Amazon Machine Image.

Question 25

What are AMI permissions available?

Answer 25

1. Public - everyone allowed 2. Owner - implicit allow 3. Explicit - specific AWS accounts allowed

Question 26

What is default RDP (Remote Desktop Protocol) port?

Answer 26

3389

Question 27

What is default SSH port?

Answer 27

22

Question 28

What is S3?

Answer 28

1. Global Storage Platform regional based with AZ replication. 2. Public service 3. Economical 4. It has Objects and Buckets

Question 29

What is the maximum size of a S3 Object?

Answer 29

5TB

Question 30

Are S3 Bucket names globally unique?

Answer 30

Yes

Question 31

Are there folders in S3?

Answer 31

No. It might look like a folder but in reality it is just a name prefix that is appended to the Object name.

Question 32

What are some S3 Bucket name limitations?

Answer 32

1. 3-63 characters 2. All lower case 3. No underscores 4. Start w/ lowercase letter or a number 5. Can't be formatted like IP addresses 6. Maximum buckets per account: 100 soft limit and 1000 hard limit (only using a support request)

Question 33

What is ARN?

Answer 33

Amazon Resource Name

Question 34

What are some CloudFormation components?

Answer 34

1. Resources 2. Description 3. AWSTemplateFormatVersion (this field is not mandatory, but if you use together with Description then Description needs to be added right after this field) 4. Metadata 5. Parameter 6. Mappings 7. Conditions 8. Outputs

Question 35

What is HA?

Answer 35

High Availability - minimizing any outrages

Question 36

What is FT?

Answer 36

Fault Tolerance - operating through faults

Question 37

What is DR?

Answer 37

Disaster Recover - used when HA and FT don't work

Question 38

What is Route53?

Answer 38

1. Register domains 2. Host zone files (DNS information) and managed nameservers 3. Global service w/ single database 4. Globally resilient (replicated between regions)