Practitioner Level

Troubleshooting AWS Network Connectivity: Security Groups and NACLs

1 hour

2 Learning Objectives

Troubleshooting basic network connectivity issues is an important skill. This troubleshooting scenario is an opportunity to assess skills in this area. Our scenario is this: a junior administrator has deployed a VPC and instances but there are a few things wrong. `Instance3` is not able to connect to the internet and the junior admin can’t determine why. Being a senior administrator, it’s your responsibility to troubleshoot the issue and ensure that the instance has connectivity to the internet, so that you can ping and log into the instance with SSH.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Determine Why the Instance Cannot Connect to the Internet

Troubleshoot connectivity for Instance3 and resolve the issue.

Identify the Second Issue Preventing the Instance from Connecting to the Internet

Identify and fix the issues that are preventing the instance from connecting to the internet.
Once they’re resolved, connect to the instance using SSH to verify connectivity. Use the cloud_user username and the password identified on the lab credentials page to login:

ssh cloud_user@<PUBLIC_IP_ADDRESS>

Additional Resources

Make sure you are in the us-east-1 region

Based on our scenario, you will need to troubleshoot why Instance3 is not internet accessible. There are issues preventing the instance from connecting to the internet. Your task is to identify and fix those issues, then verify that there is SSH connectivity to the instance.

Need a hint? Check the Hint Video. You can verify your solution watching the Solution Video.

Note: The assigning of the Elastic IP steps have slightly changed. See the lab guide on the assigning of the Elastic IP steps if needed.

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