Exam ANS-C00 topic 1 question 38 discussion

Answers: A&E. https://aws.amazon.com/ec2/faqs/ (A) SR-IOV is a method of device virtualization that provides higher I/O performance and lower CPU utilization compared to traditional implementations. For supported Amazon EC2 instances, this feature provides higher packet per second (PPS) performance, lower inter-instance latencies, and very low network jitter. (E) In order to enable this feature, you must launch an HVM AMI with the appropriate drivers.

I'd go for AE. multiple ENA is not a requirement, proper driver is.

A & E correct answers

Correct Answer AB

As explained by viduvivek

The question is about Enhanced Networking : High Packer per seconds perfromances Low inter instances latencies Low network jitter How : Using SR-IOV (Single Root I/O Virtualization Update latest drivers AE

I agree A & C. the Reasons: multiple ENA is not a requirement, Jambo is not supported inter-region VPC peering, there is no word saying across regions' VPCs

per bellow comment

I will go with A& E .

B: enhanced networking, lower latencies, highest throughput. C: Inter Region VPC peering does support JUMBO frames: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/network_mtu.html#:~:text=Traffic%20over%20an%20inter%2Dregion%20VPC%20peering%20connection

A and c

Connections across VPC Peering do not support MTU's greater than 1500, Hence Option C is invalidated. Answer - A & E

A: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking.html and C: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking-os.html

A & B for me

A & B for me https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking.html#supported_instances https://aws.amazon.com/about-aws/whats-new/2017/09/announcing-improved-networking-performance-for-amazon-ec2-instances/

Question states: lowest latency and highest packet-per-second network performance + application will talk to other servers in a peered VPC. B. Nope. SRIO provides better latency. C. Nope. Not supported across VPC Peering - limited to 1500. D. Possible but not the best - emp0 has higher IOPS, also there is optimised default and not optimised by default instances - both EBS types. None of these conflict with the instance families supported by SRIO. A. Yes. SRIO. E. Yes. Now instances that support it come with drivers preinstalled - but AWS official documentation recommends actually checking the driver is installed and configured for actual use. There is a difference between preinstalled vs actually using the correct drivers - hence reason why AWS document the process of testing out the drivers. Answer is A E.

I go with A & E