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Exam ANS-C00 topic 1 question 98 discussion

Exam question from Amazon's ANS-C00

Question #: 98
Topic #: 1

A computing team is evaluating whether to place a high performance computing (HPC) application in AWS. The team is concerned about application performance and wants to know what options are available to increase networking performance.
Which of the following changes would increase performance for this application? (Choose two.)

A. Place the application across many smaller instances to achieve higher total throughput.
B. Increase the MTU of the VPC to 9001.
C. Enable an MTU of 9001 in the application's operating system.
D. Enable enhanced networking on the instances.
E. Deploy the application in two Availability Zones and insert them in one placement group.

Show Suggested Answer

Suggested Answer: CD 🗳️

by pechung1206 at May 7, 2020, 9:05 p.m.

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SilverT

Highly Voted 3 years, 7 months ago

Correct answer C, D A- smaller instances won't increase performance B- Cannot increase MTU on a VPC C- correct D- correct E- cluster placement group could help, needs to be deployed inside one AZ

upvoted 20 times

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ITstudy

Highly Voted 3 years, 8 months ago

It should be C, D

upvoted 9 times

XXXX

3 years, 8 months ago

I support this answer https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/network_mtu.html

upvoted 2 times

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Marty2021

Most Recent 2 years, 11 months ago

Selected Answer: CD

Agree with SilverT's summary

upvoted 1 times

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RenatoFonseca

3 years, 1 month ago

Selected Answer: CD

MTU is configured in OS level, not VCP.

upvoted 3 times

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ChauPhan

3 years, 7 months ago

https://aws.amazon.com/getting-started/hands-on/hpc/3/ WS currently supports Enhanced Networking capabilities using SR-IOV (Single Root I/O Virtualization). SR-IOV is a method of device virtualization that provides higher I/O performance and lower CPU utilization compared to traditional implementations The network speed depends from the instance type and size, for example r4.16xlarge provides 20Gigabit connectivity between instances, when using the same placement group (a logical grouping of instances), and enhanced networking.

upvoted 1 times

ChauPhan

3 years, 7 months ago

So probably D,E

upvoted 1 times

sapien45

3 years, 3 months ago

dude , you just said it cant be E. C and D. MTU is increased at the OS level of the isnatnce

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ChauPhan

3 years, 7 months ago

Review the question: Cluster placement groups A cluster placement group is a logical grouping of instances within a single Availability Zone. A cluster placement group can span peered VPCs in the same Region. Instances in the same cluster placement group enjoy a higher per-flow throughput limit for TCP/IP traffic and are placed in the same high-bisection bandwidth segment of the network. So it cannot E

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CloudyMcClouderson

3 years, 7 months ago

Here is the ideal reference: https://aws.amazon.com/getting-started/hands-on/hpc/3/

upvoted 1 times

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CloudyMcClouderson

3 years, 7 months ago

We can eliminate E, a cluster placement group is within a single AZ.

upvoted 1 times

jason2009

3 years, 7 months ago

Where did you get this info. It is clearly wrong. While in a HPC situation you want a clustered PG in one AZ to maximize performance, there are other situations such as fault isolation that requires for example a spread placement group that cross multiple AZ.

upvoted 1 times

ChauPhan

3 years, 7 months ago

Partition placement groups Partition placement groups help reduce the likelihood of correlated hardware failures for your application. When using partition placement groups, Amazon EC2 divides each group into logical segments called partitions. Amazon EC2 ensures that each partition within a placement group has its own set of racks. Each rack has its own network and power source. No two partitions within a placement group share the same racks, allowing you to isolate the impact of hardware failure within your application.

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ChauPhan

3 years, 7 months ago

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html They all must be in one AZ, please refer to the picture in the link

upvoted 1 times

hecong

2 years, 11 months ago

Spread placement groups A spread placement group can span multiple Availability Zones in the same Region. You can have a maximum of seven running instances per Availability Zone per group.

upvoted 1 times

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ChauPhan

3 years, 7 months ago

Cluster placement groups A cluster placement group is a logical grouping of instances within a single Availability Zone. A cluster placement group can span peered VPCs in the same Region. Instances in the same cluster placement group enjoy a higher per-flow throughput limit for TCP/IP traffic and are placed in the same high-bisection bandwidth segment of the network.

upvoted 1 times

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