An enterprise is migrating its on-premises data center to AWS. They have a legacy mainframe application that cannot be migrated. However, the new microservices built on AWS need to query data from the mainframe with sub-millisecond latency. The mainframe and AWS are connected via AWS Direct Connect. How can the architect meet the latency requirement?

Answer options:

Use Amazon ElastiCache in the AWS region to cache mainframe data.

Deploy AWS Outposts in the on-premises data center and host the microservices on it.

Upgrade the Direct Connect connection to 100 Gbps.

Use AWS Local Zones.

How to approach this question

Identify the service that brings AWS compute on-premises to solve extreme latency constraints.

Full Answer

B.Deploy AWS Outposts in the on-premises data center and host the microservices on it.✓ Correct

Deploy AWS Outposts in the on-premises data center and host the microservices on it.

When single-digit millisecond latency is required between AWS workloads and legacy on-premises systems (like mainframes), the physical distance must be eliminated. AWS Outposts allows you to run AWS compute and storage on-premises, directly adjacent to the legacy systems.

Common mistakes

Thinking more bandwidth (100 Gbps) reduces latency.

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