Increase MTU for AWS Connectivity

Answer - D.

You are already working at the maximum allowable MTU of 1500 available for traffic traversing via the Internet.

If you are in a VPC, then you can use Jumbo frames.

This is also given in the AWS Documentation.

Jumbo frames allow more than 1500 bytes of data by increasing the payload size per packet, thus increasing the packet's percentage that is not packet overhead.

Fewer packets are needed to send the same amount of usable data.

However, outside of a given AWS region (EC2-Classic), a single VPC, or a VPC peering connection, you will experience a maximum path of 1500 MTU.

VPN connections and traffic sent over an Internet gateway are limited to 1500 MTU.

Option A is invalid because the maximum MTU in a VPN tunnel is still 1,500.

Options B and C are invalid because this will still not affect the overall MTU.

For more information on Network MTU, please visit the following URL:

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/network_mtu.html

When a device sends data over the network, the data is broken down into packets, and each packet has a maximum size that can be transmitted at once. This maximum size is called the Maximum Transmission Unit (MTU) and is usually set to 1500 bytes. However, in some cases, such as when sending large files, increasing the MTU can improve network performance.

In the given scenario, there are two AWS regions hosting applications and an on-premises network that needs to connect to these regions over the internet. The current MTU is 1500, but the payload size per packet needs to be increased.

Option A suggests creating a VPN tunnel between the two VPCs and increasing the MTU on the instances. While VPN tunnels provide a secure connection between VPCs, increasing the MTU on the instances alone won't have any impact on the payload size over the internet. Therefore, option A is incorrect.

Option B suggests increasing the MTU on the instances. Although increasing the MTU on the instances may help in sending larger packets within the same VPC, it won't have any impact on the payload size over the internet. Therefore, option B is also incorrect.

Option C suggests installing the Enhanced Networking modules on the instances. Although Enhanced Networking can improve the network performance of instances within a VPC, it won't have any impact on the payload size over the internet. Therefore, option C is also incorrect.

Option D suggests using AWS Direct Connect and routing packets between the on-premises network and AWS VPC using Jumbo Frames. AWS Direct Connect is a dedicated network connection between an on-premises network and AWS, and Jumbo Frames are larger than standard Ethernet frames and can carry more data. Using AWS Direct Connect with Jumbo Frames can improve network performance and allow for larger packet payloads, making option D the correct answer.

In conclusion, the correct answer to the given scenario is option D - Use AWS Direct Connect and route packets between the on-premises network and AWS VPC using Jumbo Frames.