Bird
Raised Fist0
AWScloud~10 mins

Default VPC overview in AWS - Interactive Code Practice

Choose your learning style10 modes available
LearnWhyDeepVisualTryChallengeProjectRecallTime

Start learning this pattern below

Jump into concepts and practice - no test required

or
Recommended
Test this pattern10 questions across easy, medium, and hard to know if this pattern is strong
Practice - 5 Tasks
Answer the questions below
1fill in blank
easy

Complete the code to describe the default VPC CIDR block.

AWS
The default VPC uses the CIDR block [1].
Drag options to blanks, or click blank then click option'
A10.0.0.0/16
B192.168.1.0/24
C172.31.0.0/16
D192.168.0.0/16
Attempts:
3 left
💡 Hint
Common Mistakes
Confusing default VPC CIDR with common private IP ranges like 10.0.0.0/16.
Using a smaller subnet mask like /24 instead of /16.
2fill in blank
medium

Complete the code to identify the default VPC's subnet type.

AWS
The default VPC contains [1] subnets in each Availability Zone.
Drag options to blanks, or click blank then click option'
Apublic
Bisolated
Cprivate
DVPN-only
Attempts:
3 left
💡 Hint
Common Mistakes
Thinking default subnets are private or isolated.
Confusing subnet types with VPN configurations.
3fill in blank
hard

Fix the error in the statement about the default VPC's internet gateway.

AWS
The default VPC [1] an internet gateway attached by default.
Drag options to blanks, or click blank then click option'
Adoes not have
Bhas
Cmay have
Drequires
Attempts:
3 left
💡 Hint
Common Mistakes
Assuming the internet gateway must be manually attached.
Confusing 'may have' with guaranteed default behavior.
4fill in blank
hard

Fill both blanks to complete the default VPC route table configuration.

AWS
The default route table has a route where destination is [1] and target is [2].
Drag options to blanks, or click blank then click option'
A0.0.0.0/0
Blocal
Cigw-12345678
Dvpc-12345678
Attempts:
3 left
💡 Hint
Common Mistakes
Using 'local' as the destination instead of 0.0.0.0/0.
Confusing VPC ID with internet gateway ID as route target.
5fill in blank
hard

Fill in the blank to describe the default VPC's security group rules.

AWS
The default security group allows inbound traffic from [1].
Drag options to blanks, or click blank then click option'
A0.0.0.0/0
B22
Ctcp
Dthe security group itself
Attempts:
3 left
💡 Hint
Common Mistakes
Assuming inbound traffic is allowed from anywhere (0.0.0.0/0) by default.
Confusing port numbers or protocols.

Practice

(1/5)
1. What is the main purpose of the AWS Default VPC?
easy
A. To monitor application performance
B. To store data backups automatically
C. To provide a ready-to-use network for launching resources quickly
D. To manage user permissions and roles

Solution

  1. Step 1: Understand what a VPC is

    A VPC is a virtual network where AWS resources run.

  2. Step 2: Identify the role of the Default VPC

    The Default VPC is pre-made to let users launch resources without extra setup.

  3. Final Answer:

    To provide a ready-to-use network for launching resources quickly -> Option C

  4. Quick Check:

    Default VPC = ready network [OK]
Hint: Default VPC means ready network for quick resource launch [OK]
Common Mistakes:
  • Confusing VPC with storage or permissions
  • Thinking Default VPC manages backups
  • Assuming Default VPC monitors performance
2. Which of the following is TRUE about the Default VPC's subnets?
easy
A. Subnets must be created manually before use
B. It has no subnets by default
C. It only has private subnets without internet access
D. It includes one subnet in each Availability Zone

Solution

  1. Step 1: Recall Default VPC subnet setup

    The Default VPC automatically creates one subnet per Availability Zone.

  2. Step 2: Check internet access for subnets

    These subnets are public and have internet access by default.

  3. Final Answer:

    It includes one subnet in each Availability Zone -> Option D

  4. Quick Check:

    Default VPC = subnet per AZ [OK]
Hint: Default VPC auto-creates subnets per AZ [OK]
Common Mistakes:
  • Thinking Default VPC has no subnets
  • Assuming subnets are private only
  • Believing subnets require manual creation
3. If you launch an EC2 instance in the Default VPC, what is the default behavior regarding internet access?
medium
A. The instance automatically gets a public IP and internet access
B. The instance can only access other instances in the same subnet
C. The instance has no internet access unless manually configured
D. The instance is blocked from all network traffic by default

Solution

  1. Step 1: Understand Default VPC internet setup

    Default VPC subnets are public and assign public IPs automatically.

  2. Step 2: Check instance network behavior

    Instances launched get internet access by default through the internet gateway.

  3. Final Answer:

    The instance automatically gets a public IP and internet access -> Option A

  4. Quick Check:

    Default VPC instance = public IP + internet [OK]
Hint: Default VPC instances get public IPs automatically [OK]
Common Mistakes:
  • Assuming no internet without manual setup
  • Thinking instances are isolated by default
  • Believing network traffic is blocked initially
4. You try to launch an EC2 instance in the Default VPC but get a network error. What is the most likely cause?
medium
A. The Default VPC was deleted or modified incorrectly
B. You forgot to create a subnet manually
C. The instance type is not supported in the Default VPC
D. AWS does not allow EC2 in Default VPC

Solution

  1. Step 1: Recall Default VPC properties

    Default VPC exists by default with subnets and internet gateway.

  2. Step 2: Analyze network error cause

    If network errors occur, it often means the Default VPC was deleted or changed wrongly.

  3. Final Answer:

    The Default VPC was deleted or modified incorrectly -> Option A

  4. Quick Check:

    Network error = Default VPC missing/changed [OK]
Hint: Network errors often mean Default VPC missing or changed [OK]
Common Mistakes:
  • Assuming subnets must be created manually
  • Thinking instance type blocks launch
  • Believing EC2 is disallowed in Default VPC
5. You want to launch a private EC2 instance without internet access using the Default VPC. What should you do?
hard
A. Launch in the Default VPC subnet and disable the public IP
B. Create a new private subnet in the Default VPC and launch the instance there
C. Use the Default VPC as is; all instances are private by default
D. Delete the Default VPC and create a custom VPC with no internet gateway

Solution

  1. Step 1: Understand Default VPC subnet types

    Default VPC subnets are public with internet access by default.

  2. Step 2: Plan for private instance launch

    To have a private instance, create a new private subnet without internet gateway attachment.

  3. Step 3: Avoid deleting Default VPC unnecessarily

    Deleting Default VPC is not required; just add private subnet inside it.

  4. Final Answer:

    Create a new private subnet in the Default VPC and launch the instance there -> Option B

  5. Quick Check:

    Private instance = new private subnet in Default VPC [OK]
Hint: Add private subnet in Default VPC for no internet [OK]
Common Mistakes:
  • Assuming disabling public IP alone makes instance private
  • Thinking all Default VPC instances are private
  • Deleting Default VPC unnecessarily