Question 22

Explanation

Correct option:

To support throughput near or exceeding 20K packets per second (PPS) on the VIF driver - Enhanced networking uses single root I/O virtualization (SR-IOV) to provide high-performance networking capabilities on supported instance types. SR-IOV is a method of device virtualization that provides higher I/O performance and lower CPU utilization when compared to traditional virtualized network interfaces. Enhanced networking provides higher bandwidth, higher packet per second (PPS) performance, and consistently lower inter-instance latencies. There is no additional charge for using enhanced networking.

Consider using enhanced networking for the following scenarios:

1. If your packets-per-second rate reaches its ceiling, consider moving to enhanced networking. If your rate reaches its ceiling, you've likely reached the upper thresholds of the virtual network interface driver.

2. If your throughput is near or exceeding 20K packets per second (PPS) on the VIF driver, it's a best practice to use enhanced networking.

All current generation instance types support enhanced networking, except for T2 instances.

Incorrect options:

To reach speeds up to 2,500 Gbps between EC2 instances - If you need to reach speeds up to 25 Gbps between instances, launch instances in a cluster placement group along with ENA compatible instances. If you need to reach speeds up to 10 Gbps between instances, launch your instances into a cluster placement group with the enhanced networking instance type. This option has been added as a distractor, as it is not possible to support speeds up to 2,500 Gbps between EC2 instances.

To configure multi-attach for an EBS volume that can be attached to a maximum of 16 EC2 instances in a single Availability Zone - An EBS (io1 or io2) volume, when configured with the new Multi-Attach option, can be attached to a maximum of 16 EC2 instances in a single Availability Zone. Additionally, each Nitro-based EC2 instance can support the attachment of multiple Multi-Attach enabled EBS volumes. Multi-Attach capability makes it easier to achieve higher availability for applications that provide write-ordering to maintain storage consistency. You do not need to use enhanced networking to configure this option.

To configure Direct Connect to reach speeds up to 25 Gbps between EC2 instances - AWS Direct Connect is a networking service that provides an alternative to using the internet to connect your on-premises resources to AWS Cloud. In many circumstances, private network connections can reduce costs, increase bandwidth, and provide a more consistent network experience than internet-based connections. You cannot use enhanced networking to configure Direct Connect to reach speeds up to 25 Gbps between EC2 instances.

References:

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking.html

https://aws.amazon.com/premiumsupport/knowledge-center/enable-configure-enhanced-networking/

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-volumes-multi.html