VPC - Virtual Private Cloud

Question 1

What is a Switch?

Answer 1

It connects computers on the same network to allow them to share the same data, without requiring use of the router/internet.

Question 2

What does VPC stand for?

Answer 2

Virtual Private Cloud

Question 3

What is the definition of VPC?

Answer 3

Simplied Definition:
A Virtual Private Cloud (VPC) is a private subsection of AWS that you control, into which you cna place AWS resrources (such as EC2 isntances and databses). You have full control over who has access to the AWS resources that you place inside your VPC.

AWS Definition:
Amazon Virtual Private Cloud (Amazon VPC) lets you provision a logically isolated section of AWS cloud where you can launch AWS resources in a virtual network that you define. You have complete control over your virtual networking environment, including selection of your own IP address range, creation of subnets, and configuration of route tables and network gateways.

NOTE: When you create an AWS account, a “default” VPC is created for you.

Question 4

True or False: A default VPC is created for you when you create an AWS account?

Answer 4

True

Question 5

What is a Subnet?

Answer 5

A subnet (Subnetwork) is a subection of a network. Generally, a subnet includes all of the computers in a specific location.

Example: All houses on the same street in a neighborhood would be a subnet.

Question 6

What does IGW stand for?

Answer 6

Internet Gateway

Question 7

Definition of Internet Gateway (IGW)?

Answer 7

Simplified Definited:

A combination of hardware and software that provides your private network with a route to the world outside (the internet) of the VPC.

AWS Defintion:

An internet Gateway is a horizontally scaled, redundant and highly available VPC component that allows communication between instances in your VPC and the internet. It therefore imposes no availability risks or bandwith constraints on your network traffic.

Question 8

True or False: Your default VPC already has an IGW attached?

Answer 8

True

Question 9

What is the definition of a Route Table?

Answer 9

A route table contains a set of rules, called routes, that are used to determine where network traffic is directed.

Question 10

True or Fales: Your default VPC does not contain a main route table?

Answer 10

False: Your default VPC already has a main route table.

Question 11

What does NACL stand for?

Answer 11

Network Access Control List

Question 12

What is a Network Access Control List (NACL)?

Answer 12

A firewall/security layer on the subnet level that con trols inbound and outbound traffic for one or more subnets.

Question 13

What is a Security Group?

Answer 13

A firewall/security layer on the instance/server level.

Question 14

True or False: You can add one or more subnets in each Availability Zone?

Answer 14

True

Question 15

True or False: Each subnet can span more than one Availability Zone?

Answer 15

False: Each subnet must reside entirely within one Availability Zone and cannot span zones.

Question 16

True or False: The default VPC has an NACL associated with the default subnet?

Answer 16

True.

Question 17

What is the default of an NACL?

Answer 17

Allows ALL inbound and outbound traffic.

Question 18

How are Inbound and Outbound Rules Processed?

Answer 18

1. Rules are evaluated based on rule # from the lowest to highest.
2. The first rule evaluated that applies to the traffic types gets immediately applied and executed regardless of the rules that come after (have a higher rule #).