Pattern Design Architectural and Enterprise Patterns 3

Question 1

The Bulkhead pattern in distributed systems is analogous to:

Accepted Answer

Watertight compartments in a ship that prevent one leak from sinking the whole vessel

Answer

The Bulkhead pattern isolates elements of an application into pools so that if one fails, the others continue to function.

Question 2

The Circuit Breaker pattern helps prevent:

Accepted Answer

Cascading failures when a downstream service is unavailable

Answer

The Circuit Breaker monitors calls to an external service and stops sending requests when failures exceed a threshold, giving the service time to recover.

Question 3

In Domain-Driven Design, an Aggregate is:

Accepted Answer

A cluster of domain objects treated as a single unit for data changes

Answer

An Aggregate is a boundary around a group of domain objects that ensures consistency — all changes go through the Aggregate Root.

Question 4

The Backend for Frontend (BFF) pattern creates:

Accepted Answer

A dedicated API layer tailored for each specific frontend client

Answer

BFF creates separate backend services optimized for each frontend (e.g., web BFF, mobile BFF), avoiding a one-size-fits-all API.

Question 5

Eventual consistency in distributed systems means:

Accepted Answer

All nodes will reach the same state given enough time and no new updates

Answer

Eventual consistency guarantees that, in the absence of new updates, all replicas will converge to the same value, trading immediate consistency for higher availability.

Pattern Design Practice Test

Pattern Design Practice Test

Pattern Design Architectural and Enterprise Patterns 3