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Exam ANS-C00 topic 1 question 322 discussion

Exam question from Amazon's ANS-C00

Question #: 322
Topic #: 1

Your company wishes to improve the performance of its EC2 instances. They require low latency and high throughput. They are currently deployed on T2.medium.
It is imperative that you experience as little downtime as possible, but cost and performance are most important. How should you accomplish this?

A. Create AMIs from the instances, create new instances on t2.medium, and start those instances in a placement group.
B. Create AMIs from the instances, deploy the instances as i3.large, and start those instances in a placement group.
C. Stop the instances and restart them in a placement group.
D. Add an extra ENI to the instances and team them to provide greater throughput.

Show Suggested Answer

Suggested Answer: B 🗳️
T2. medium is not compatible with placement groups. You cannot team ENIs to add more throughput on AWS.

by doski at Jan. 2, 2021, 11:06 a.m.

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Comments

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shaji123

2 years, 11 months ago

Answer C Why - You can add/remove/change the placement group of a stopped instance. Refer - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html#change-instance-placement-group

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Krish812003

3 years, 7 months ago

The answer is B because t2.medium instances are not supported in the Cluster Placement group. I tried to launch a t2.medium instance and place it under the placement group it throws an error that it is not supported.

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wahlbergusa

3 years, 7 months ago

Answer is B. The requirement is clearly mentioned in the question as "low latency and high throughput" According to this AWS doc = > https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html#concepts-placement-groups , T2 instances are not supported in Cluster Placement Group. Period.

upvoted 4 times

walkwolf3

3 years, 7 months ago

Agreed answer is B.

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ChauPhan

3 years, 7 months ago

C. Stop the instances and restart them in a placement group. Create AMIs will generate more cost. As the little DT is acceptable, stop/start instances save cost

upvoted 1 times

ChauPhan

3 years, 7 months ago

Change my mind to A. Create AMIs from the instances, create new instances on t2.medium, and start those instances in a placement group. Because it requires shortest DT.

upvoted 1 times

jithin1234

3 years, 7 months ago

Cluster placement group rules and limitations The following rules apply to cluster placement groups: Instances in a cluster placement group you must use the following supported instance types: Current generation instances, except for burstable performance instances (for example, T2) and Mac1 instances. The following previous generation instances: A1, C3, cc2.8xlarge, cr1.8xlarge, G2, hs1.8xlarge, I2, and R3.

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eeghai7thioyaiR4

3 years, 8 months ago

Ans: B

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Ganfeng

3 years, 8 months ago

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html ... Instances in a cluster placement group you must use the following supported instance types: Current generation instances, except for burstable performance instances (for example, T2) and Mac1 instances. ==== Except type like T2?

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VEV

3 years, 8 months ago

It should be B as T2.Medium is not supported in placement groups nor it supports ENA

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doski

3 years, 8 months ago

Correct answer is A. It was already stated that there's allowance for minimal downtime. Also T2.medium supports all types of placement groups (as of today)

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fgg89

3 years, 7 months ago

Where is it stated that placement groups support burstable performance instances like T2?

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JamesTR

3 years, 7 months ago

If T2.medium supports placements groups, you can as well move existing instances to placement group. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html#change-instance-placement-group Answer C is then the correct one ?

upvoted 1 times

ChauPhan

3 years, 7 months ago

It requires shortest DT, so you need to launch new instances from AMI first, put them into placement group, then terminate old instances. If you stop/restart instances, it causes DT.

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