Troubleshooting AWS Network Connectivity: Security Groups and NACLs

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Troubleshooting AWS Network Connectivity: Security Groups and NACLs

Troubleshooting basic network connectivity issues is an important skill. This troubleshooting scenario is an opportunity to assess your skills in this area. In this lab scenario, 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 the instance has connectivity to the internet, so that you can ping and log in to the instance using SSH.

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Lab Info

Level

Intermediate

Last updated

Sep 24, 2025

Duration

1h 0m

Challenge

Determine Why the Instance Cannot Connect to the Internet
1. Troubleshoot connectivity for Instance3 and resolve the issue. You can use ping tests from either your local PC or you can ssh into Instance 1 to do the ping tests for the lab.
Challenge

Identify the Issues Preventing the Instance from Connecting to the Internet
1. Identify and fix the issues that are preventing the instance from connecting to the Internet.
2. 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>

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