312-50V9 Question #144: Real Exam Question with Answer & Explanation

The correct answer is A: Application layers can be separated, allowing each layer to be upgraded independently from other. N-tier architecture uniquely separates application functionality into distinct layers that can be independently deployed, scaled, and upgraded without affecting other layers.

Question

Which of the following items is unique to the N-tier architecture method of designing software applications?

Options

AApplication layers can be separated, allowing each layer to be upgraded independently from other
BIt is compatible with various databases including Access, Oracle, and SQL.
CData security is tied into each layer and must be updated for all layers when any upgrade is
DApplication layers can be written in C, ASP.NET, or Delphi without any performance loss.

Explanation

N-tier architecture uniquely separates application functionality into distinct layers that can be independently deployed, scaled, and upgraded without affecting other layers.

Common mistakes.

B. Database compatibility with multiple vendors is not unique to N-tier - many architectures including monolithic and two-tier designs can connect to Access, Oracle, or SQL databases.
C. Requiring security updates across all layers simultaneously describes a tightly coupled system, which is the opposite of N-tier's independent-layer design philosophy.
D. Language flexibility in writing application components is not unique to N-tier architecture - other architectural patterns also support multiple programming languages without performance penalties.

Concept tested. N-tier architecture layer independence and separation of concerns

Reference. https://learn.microsoft.com/en-us/azure/architecture/guide/architecture-styles/n-tier

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