CSI System Design & Architecture 3

Question 1

Which integration middleware pattern uses a central hub to route messages between systems, creating a hub-and-spoke topology?

Accepted Answer

Enterprise Service Bus (ESB)

Answer

An ESB acts as a central hub orchestrating message routing, transformation, and protocol mediation between connected spoke systems.

Question 2

A system must handle 10,000 concurrent users during peak hours but only 500 during off-peak. Which architecture strategy best addresses this requirement?

Accepted Answer

Horizontal auto-scaling with elastic infrastructure

Answer

Horizontal auto-scaling dynamically adds or removes instances based on load, efficiently handling variable traffic without over-provisioning.

Question 3

What is the key difference between synchronous and asynchronous integration patterns?

Accepted Answer

Synchronous waits for a response before proceeding; asynchronous sends and continues without waiting

Answer

Synchronous integration blocks the caller until a response is received, while asynchronous integration allows the caller to continue processing without waiting.

Question 4

In database design for integrated systems, which normalization form ensures that every non-key attribute is fully dependent on the entire primary key?

Accepted Answer

Second Normal Form (2NF)

Answer

Second Normal Form (2NF) requires that all non-key attributes be fully functionally dependent on the complete primary key, eliminating partial dependencies.

Question 5

Which architectural pattern stores state changes as an immutable sequence of events rather than the current state snapshot?

Accepted Answer

Event Sourcing

Answer

Event Sourcing persists every state change as an immutable event, allowing the current state to be rebuilt by replaying the event log.

(CSI) Certified System Integrator Practice Test

(CSI) Certified System Integrator Practice Test

CSI System Design & Architecture 3