Resolve VPC Routing Conflicts

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As a network engineer, you are contacted by a client who cannot reach its website. The client has a two-tier web application in its AWS Cloud environment. The web application consists of two Amazon Virtual Private Clouds (Amazon VPC) peered together with the Application Load Balancer (ALB) nodes hosted in “VPC-ALB” and the web servers (targets) hosted in “VPC-Target”. To resolve the issue reported by client, you will need to troubleshoot all the tasks in this lab.

Level

Advanced

Duration

1 Hour 30 Minutes

Course Objectives

In this course, you will learn how to:

• Determine the elements needed to successfully troubleshoot routing misconfiguration in intra-cloud communication.
  
• Examine and construct the most suitable networking configuration for load balancing in a high availability architecture.

Intended Audience

This course is intended for:

• Infrastructure Engineers responsible for creating the systems and networks needed for  computer cloud systems. 

Prerequisites

We recommend that attendees of this course have the following prerequisites:

Remember that this lab includes all the components that you need to troubleshoot. There will not be troubleshooting steps because you are supposed to figure out by yourself. However, we have included hints at the end of every task to help you troubleshoot the issues. You must be familiar with the following:

• All the components of a VPC and the ALB.
• How the traffic flows in & out of a VPC.
• How to allow and restrict traffic in a VPC.
• How the request flows from the client to the ALB.
• How an ALB routes the requests to the backends.

Course Outline

Task 1: Troubleshoot the connectivity between the instances in VPC-ALB and VPC-Target

Task 2: Investigate why the targets are not processing the incoming requests

Task 3: Investigate why the ALB DNS name is failing intermittently