A company wants to ensure that two Amazon EC2 instances are in separate data centers with minimal communication latency between the data centers. How can the company meet this requirement?
A.
Place the EC2 instances in two separate AWS Regions connected with a VPC peering connection.
B.
Place the EC2 instances in two separate Availability Zones within the same AWS Region.
C.
Place one EC2 instance on premises and the other in an AWS Region. Then connect them by using an AWS VPN connection.
D.
Place both EC2 instances in a placement group for dedicated bandwidth.
the answer is B.
A cluster placement group is a logical grouping of instances within a SINGLE AVAILABILITY ZONE that benefits from low network latency, high network throughput.
in the question, it said DIFFERENT DATA CENTERS
D. Place both EC2 instances in a placement group for dedicated bandwidth.
"You can use placement groups to influence the placement of a group of interdependent instances to meet the needs of your workload. Depending on the type of workload, you can create a placement group using one of the following placement strategies:
Cluster – packs instances close together inside an Availability Zone. This strategy enables workloads to achieve the low-latency network performance necessary for tightly-coupled node-to-node communication that is typical of high-performance computing (HPC) applications."
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html
Cluster, Partition, Spread- none of the guarantee that the instances will be placed different data centers. Instead, the instances will not be placed in the same underlying hardware.
Question says DIFFERENT DATA CENTERS, so it cannot be placement groups, as yourself mentioned "packs instances close together inside an Availability Zone". Same Availability Zone = Same Data Center
Availability Zones are isolated locations within an AWS Region that are connected by low-latency networks. Placing the EC2 instances in two separate Availability Zones will ensure that they are in different data centers, while still maintaining low communication latency.
in the same AvZone the latency will be lower. Actually the placement group will be a choice but it did not give the option to differenciate the datacenter between the EC2 instance.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html
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