Q80 — AWS ANS-C01 Ch.1

Question 80 of 100 | ← Chapter 1

A company is running its application servers on Amazon EC2 instances. The EC2 instances run in separate VPCs that are connected by a transit Gateway. The EC2 instances launch in a private subnet with a route to the transit gateway for internal and external connectivity. The external Connectivity is provided by a VPC with firewall devices that perform an inspection for packets that ingress and egress through an internet Gateway.A network engineer needs to help the company’s application team increase the payload size per packet delivery between the EC2 instances. All Network connectivity must be through the transit gateway What should the network engineer do to meet these requirements?

• A. Enable jumbo frames on the transit gateway. Instruct the application team to set the maximum transmission unit (MTU) of the system’s Network interfaces to 9001 bytes. ✓
• B. Instruct the application team to set the maximum transmission unit (MTU) of the VPC to 8500 bytes.
• C. Instruct the application team to set up enhanced networking on the system by using the enhanced networking adapter. Set the maximum Transmission unit (MTU) to 9001 bytes.
• D. Instruct the application team to set the maximum transmission unit (MTU) of the system’s network interfaces to 8500 bytes.

Correct Answer: A. Enable jumbo frames on the transit gateway. Instruct the application team to set the maximum transmission unit (MTU) of the system’s Network interfaces to 9001 bytes.

Explanation

Amazon Transit Gateway支持Jumbo frames，但需要显式启用。EC2实例的网络接口MTU需设置为9001以匹配。VPC本身不直接设置MTU，增强网络适配器不直接影响MTU兼容性。选项A正确启用Transit Gateway的Jumbo frames并配置实例MTU，确保端到端支持大报文传输。AWS文档指出Transit Gateway默认MTU为8500，启用Jumbo frames后提升至8500，结合实例设置9001 MTU可优化负载。