CIDR blocks and IP addressing in AWS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a VPC with a CIDR block of 10.0.0.0/16.

AWS

resource "aws_vpc" "main" {
  cidr_block = "[1]"
}

Drag options to blanks, or click blank then click option'

A172.16.0.0/12

B192.168.0.0/24

C255.255.255.0

D10.0.0.0/16

Attempts:

3 left

💡 Hint

Common Mistakes

Using a subnet mask like 255.255.255.0 instead of a CIDR block.

Choosing a CIDR block that is too small for the VPC.

The CIDR block 10.0.0.0/16 defines a private network range suitable for a VPC.

2fill in blank

medium

Complete the code to create a subnet with CIDR block 10.0.1.0/24 inside the VPC.

AWS

resource "aws_subnet" "subnet1" {
  vpc_id     = aws_vpc.main.id
  cidr_block = "[1]"
}

Drag options to blanks, or click blank then click option'

A10.0.1.0/24

B10.0.0.0/16

C192.168.1.0/24

D172.16.1.0/28

Attempts:

3 left

💡 Hint

Common Mistakes

Using a CIDR block outside the VPC range.

Choosing a subnet that overlaps with another subnet.

The subnet CIDR block 10.0.1.0/24 fits inside the VPC's 10.0.0.0/16 range.

3fill in blank

hard

Fix the error in the subnet CIDR block to be a valid subnet inside the VPC 10.0.0.0/16.

AWS

resource "aws_subnet" "subnet2" {
  vpc_id     = aws_vpc.main.id
  cidr_block = "[1]"
}

Drag options to blanks, or click blank then click option'

A10.1.0.0/16

B192.168.0.0/24

C10.0.2.0/24

D172.16.0.0/12

Attempts:

3 left

💡 Hint

Common Mistakes

Using a subnet CIDR block that is the same size or larger than the VPC.

Choosing a subnet outside the VPC's IP range.

The subnet 10.0.2.0/24 is valid inside the VPC 10.0.0.0/16. The option 10.1.0.0/16 is outside the VPC range.

4fill in blank

hard

Fill both blanks to create a subnet with 512 IP addresses inside the VPC 10.0.0.0/16.

AWS

resource "aws_subnet" "subnet3" {
  vpc_id     = aws_vpc.main.id
  cidr_block = "[1]"
  availability_zone = "[2]"
}

Drag options to blanks, or click blank then click option'

A10.0.4.0/23

Bus-east-1a

C10.0.8.0/24

Dus-west-2b

Attempts:

3 left

💡 Hint

Common Mistakes

Using a /24 subnet which only has 256 IP addresses.

Choosing an availability zone from a different region.

A /23 subnet has 512 IP addresses, and us-east-1a is a valid availability zone.

5fill in blank

hard

Fill all three blanks to define a route table with a route to the internet gateway for the VPC 10.0.0.0/16.

AWS

resource "aws_route_table" "rt" {
  vpc_id = aws_vpc.main.id

  route {
    cidr_block = "[1]"
    gateway_id = aws_internet_gateway.[2].id
    depends_on = [aws_internet_gateway.[3]]
  }
}

Drag options to blanks, or click blank then click option'

A0.0.0.0/0

Bigw_main

D10.0.0.0/16

Attempts:

3 left

💡 Hint

Common Mistakes

Using the VPC CIDR block instead of 0.0.0.0/0 for the route.

Mismatching the internet gateway resource name in gateway_id and depends_on.

The route to 0.0.0.0/0 sends all traffic to the internet gateway. The gateway_id and depends_on must reference the correct internet gateway resource name.