AWS Certified Advanced Networking – Specialty (ANS-C01) — Question 12

A company has two on-premises data center locations. There is a company-managed router at each data center. Each data center has a dedicated AWS Direct Connect connection to a Direct Connect gateway through a private virtual interface. The router for the first location is advertising 110 routes to the Direct Connect gateway by using BGP, and the router for the second location is advertising 60 routes to the Direct Connect gateway by using BGP. The Direct Connect gateway is attached to a company VPC through a virtual private gateway.
A network engineer receives reports that resources in the VPC are not reachable from various locations in either data center. The network engineer checks the VPC route table and sees that the routes from the first data center location are not being populated into the route table. The network engineer must resolve this issue in the most operationally efficient manner.
What should the network engineer do to meet these requirements?

Answer options

• A. Remove the Direct Connect gateway, and create a new private virtual interface from each company router to the virtual private gateway of the VPC.
• B. Change the router configurations to summarize the advertised routes.
• C. Open a support ticket to increase the quota on advertised routes to the VPC route table.
• D. Create an AWS Transit Gateway. Attach the transit gateway to the VPC, and connect the Direct Connect gateway to the transit gateway.

Correct answer: B

Explanation

The correct answer is B because summarizing the advertised routes allows more routes to fit within the limits of the VPC route table, ensuring they are populated correctly. Option A is incorrect as removing the Direct Connect gateway is unnecessary and would disrupt connectivity. Option C does not address the immediate issue since increasing the quota might not solve the underlying problem of route advertisement. Option D introduces unnecessary complexity by adding a Transit Gateway when the issue can be resolved by modifying the route advertisement.