What is a benefit of running multiple instances of a back-end service and using load balancing to distribute the communication between the front-end and back-end services?
A.
High availability is provided for the back-end services.
B.
Scaling horizontally is automated out of the box.
C.
The total load on the database servers decreases.
D.
The consistency of data for stateful services increases.
A is correct DEVCOR Study guide p 19
Load balancing has other benefits besides performance scalability:
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- High availability and reliability: Requests are only sent to servers that
are online and healthy.
- Reduced downtime: A single server failure does not bring service down.
- Redundancy: Operational servers take over a failed server’s load.
- Flexibility: Servers may be transparently added or removed from their
group, as needed.
- Efficiency: The load may be distributed across servers based on their
load, response time, number of connections, and so on.
A. Correct
B. No
C. No, the total load is the same but it is distributed over each
D. No
From DEVCOR 350-901 Study Guide.
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