Suggested Answer:AC🗳️
A placement group can span multiple VPCs but may not experience the full performance benefit. The only way to add instances from one placement group to another is to create AMIs out of the instances and spin them all up into one placement group.
A and C are correct for all three placement group types.
B and D are are correct for some placement types but not for all of them.
For me, the best answer is AC
If they read this, there are 3 valid answers, you can launch security groups in VPCs joined by a Peering, it is better to launch instances of the same type and additionally you cannot join placement groups :
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html
C & D
You can launch multiple instance types into a cluster placement group. However, this reduces the likelihood that the required capacity will be available for your launch to succeed. We recommend using the same instance type for all instances in a cluster placement group.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html#concepts-placement-groups
I think the best answers are C and D.
C is for sure correct as it is stated on the "General rules and limitations" for all placement groups.
D is correct because, even you can deploy different instance types on a placement group, it is a best practice to deploy the same instance type: "You can launch multiple instance types into a cluster placement group. However, this reduces the likelihood that the required capacity will be available for your launch to succeed. We recommend using the same instance type for all instances in a cluster placement group.". The answer says "It is best", not "You have to" or "Is mandatory to".
A and B are confusing because they apply to some types of placement groups but not all. For me C and D apply to all so they are the most correct answers.
I go with B and D.
B
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.
D. Nothing wrong with it. In fact, it is recommended to have consistent performance
C. Can be done but not easy and completed
A. What if VPC is different region? can't do
answer should be CD.
You can launch multiple instance types into a cluster placement group. However, this reduces the likelihood that the required capacity will be available for your launch to succeed. We recommend using the same instance type for all instances in a cluster placement group.
there is nothing specific about cluster type .
The question says can placebout group span AZ
yes they can
technically it is right .
Again its an old question so needs update
CD.
You cannot merge placement groups and from below link.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html#concepts-placement-groups
"You can launch multiple instance types into a cluster placement group. However, this reduces the likelihood that the required capacity will be available for your launch to succeed. We recommend using the same instance type for all instances in a cluster placement group."
Agreed CD.
ABCD all looks correct. But there are some small cases that caused A & B not totally correct.
A. Only cluster placement group can span peered VPCs
B. Only spread placement group can span multiple Availability Zones
D is confusing
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html
General rules and limitations
Before you use placement groups, be aware of the following rules:
The name that you specify for a placement group must be unique within your AWS account for the Region.
You can't merge placement groups.
Changing the placement group for an instance
You can change the placement group for an instance in any of the following ways:
Move an existing instance to a placement group
Move an instance from one placement group to another
Remove an instance from a placement group
You can launch multiple instance types into a cluster placement group. However, this reduces the likelihood that the required capacity will be available for your launch to succeed. We recommend using the same instance type for all instances in a cluster placement group.
D is correct too, mentioned in the following article; B is also partial right if it is the spread placement group. It is false if it is cluster placement group. The question doesn't mention what placement group it refers to. Confusing
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html
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