AWS Certified Advanced Networking – Specialty (ANS-C00) — Question 201

Your VPC has a DX connection that is advertising 99 routes. You have two more prefixes to add: 10.223.1.0/24 and 10.223.2.0/24. You have several locations, so you need to be as exact as possible with your routing.
How would you do this?

Answer options

• A. Add the prefixes; AWS allows for as many BGP routes as you need but not static.
• B. Contact AWS to extend the number of prefixes you are allowed to advertise.
• C. Summarize the routes into a 10.223.0.0/22 and advertise that route instead.
• D. Summarize the routes into a 10.223.0.0/12 and advertise that route instead.

Correct answer: C

Explanation

The correct answer is C because summarizing the two routes into 10.223.0.0/22 allows for more efficient routing while staying within the limit of advertised prefixes. Option A is incorrect because while AWS allows many BGP routes, you are already at the limit. Option B is not the right approach since contacting AWS is unnecessary when summarization can solve the issue. Option D is incorrect as it summarizes too broadly, potentially causing routing issues.