Exam AWS Certified SysOps Administrator - Associate topic 1 question 9 discussion

D - I think. Keep in mind placement groups can't cross regions.

answer D: Spread works only in 1 region. Max instace per avalibility zone 7. if 3 availibility zone = 21 Istance. ( Question=10 istance) "A spread placement group is a group of instances that are each placed on distinct racks, with each rack having its own network and power source." All istance are placed on different racks for a maximun of 7 istance for Availability Zone. "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." https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html#placement-groups-spread

Answer is D

D is the answer

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html A spread placement group is a group of instances that are each placed on distinct hardware.

B. Launch the instances into a partition placement group in multiple AWS Regions.

D. Launch the instances into a spread placement group in a single AWS Region. A spread placement group is a logical grouping of instances that are placed on distinct underlying hardware to reduce the risk of simultaneous failures due to hardware issues. This ensures high availability. In this scenario, the requirement is to have the instances on distinct underlying hardware, and since the application needs to be highly available, you should launch them in a single AWS Region to keep them close for low latency. Options A and B are incorrect because they involve multiple AWS Regions, which is not necessary for the given requirements. Option C is incorrect because it suggests using a spread placement group in multiple AWS Regions, which is not supported.

Placement groups are within AZs, hence one AZ correlates to only one Region https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html Spread placement for unique hardware across the same AZ for ultimate redundancy Cluster placement uses hardware within the same AZ for faster networking Partition placement deploys equal sets of hardware across unique racks for redundancy

D. Launch the instances into a spread placement group in a single AWS Region is right answer.

What is the difference between spread placement group and partition group? The spread placement group setup may be similar to partition placement groups, but the main difference is that partition placement groups are made of several instances on each partition, while spread groups are just single individual instances spread through different racks or AZs.

We know its spread placement because this is associated with high availability. But its D because they cannot travel across regions

ddddddd

B incorrect - you cant launch them in multiple AWS regions.. Only D

Ans: D

Spread – strictly places a small group of instances across distinct underlying hardware to reduce correlated failures. A rack spread placement group can span multiple Availability Zones in the same Region. For rack spread level placement groups, you can have a maximum of seven running instances per Availability Zone per group.

D. Spread in single region is the answer (max 7 instances per AZ). Not that placement groups can't cross regions.

D definitely, because we need ec2s in separated racks and because placement groups do not cross regions