SOA-C02 · Question #177
A gaming application is deployed on four Amazon EC2 instances in a default VPC. The SysOps administrator has noticed consistently high latency in responses as data is transferred among the four…
The correct answer is C. a placement group. Placement groups (option C) cluster EC2 instances onto physically close hardware within a single Availability Zone, using high-bandwidth, low-latency networking - exactly what inter-instance communication in a gaming app demands. A dedicated VPC (A) changes network isolation…
Question
A gaming application is deployed on four Amazon EC2 instances in a default VPC. The SysOps administrator has noticed consistently high latency in responses as data is transferred among the four instances. There is no way for the administrator to alter the application code. The MOST effective way to reduce latency is to relaunch the EC2 instances in:
Options
- Aa dedicated VPC.
- Ba single subnet inside the VPC.
- Ca placement group.
- Da single Availability Zone.
How the community answered
(35 responses)- A14% (5)
- B3% (1)
- C77% (27)
- D6% (2)
Explanation
Placement groups (option C) cluster EC2 instances onto physically close hardware within a single Availability Zone, using high-bandwidth, low-latency networking - exactly what inter-instance communication in a gaming app demands. A dedicated VPC (A) changes network isolation, not physical proximity, so latency is unaffected. A single subnet (B) ensures instances are in the same AZ but does not guarantee physical co-location on the same underlying hardware. A single Availability Zone (D) is what a cluster placement group already enforces plus adds the physical proximity guarantee - AZ alone without a placement group still allows instances to be spread across distant racks. Memory tip: Think of a placement group as "packing your instances into the same room" - the closer the hardware, the faster the conversation between instances.
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