AWS Certified Advanced Networking – Specialty (ANS-C00) — Question 153

You want to ensure you have the absolute best transmission rates inside and outside your VPC. You are concerned about the MTU settings. What is the best way to configure your T2 instances to ensure the best compatibility?

Answer options

• A. Set all MTU to 1500 as that is the best way to ensure compatibility.
• B. Leave everything as is.
• C. Configure two ENIs, one for internal traffic and one for external traffic. Configure the external ENI with an MTU of 1500 and the internal ENI with an MTU of 9001.
• D. Set all MTU to 9001 as that is the best way to ensure the best speed. The packets will be fragmented if they have to be.

Correct answer: C

Explanation

Option C is correct because it allows for optimal MTU settings for different types of traffic, ensuring the best performance by using an MTU of 1500 for external traffic and 9001 for internal traffic. Option A is incorrect as setting all MTUs to 1500 may not leverage the benefits of larger packets for internal traffic. Option B does not address the MTU concerns at all, and Option D, while aiming for speed, could lead to fragmentation for external traffic, resulting in inefficiencies.