Consider an application that comprises both web and EJB components. What are two benefits of implementing a multitier cluster architecture over a single-tier(basic) cluster architecture? (Chose two.)

A multitier cluster architecture separates application components, such as web and EJB tiers, into distinct clusters. This separation provides significant advantages over a single-tier (basic) architecture where all components reside in one cluster. A primary benefit is independent scalability (C); the web tier can be scaled out to handle increased user traffic without affecting the EJB tier, and vice-versa. This allows for more efficient resource allocation. Another key benefit is reusability (D); a centralized EJB tier can serve multiple, different web applications or front-end clusters. This promotes a service-oriented design, reduces code duplication, and simplifies maintenance by consolidating business logic.

A. Dynamic clusters are only supported for the multitier architecture Dynamic clusters are a feature for managing servers based on a template and are supported in both single-tier and multitier architectures.
B. Remote EJB access is blocked This is incorrect. A multitier architecture is specifically designed to facilitate, not block, remote communication between the web tier and the EJB tier.
E. All servers can be managed (started/stopped) together This is a general feature of WebLogic Server clusters, applicable to both single-tier and multitier architectures, not a unique benefit of one over the other.

1. Oracle® Fusion Middleware

Understanding Oracle WebLogic Server 12.2.1.4

"Recommended Multi-Tier Architecture" section.

This section explicitly details the benefits of a multitier architecture. It states: "You can scale the presentation and business logic tiers independently

which allows you to maximize the use of your hardware." This directly supports option C. It also notes: "Multiple presentation tiers can use the same cluster of EJBs

" which directly supports option D.

2. Oracle® Fusion Middleware

Administering Clusters for Oracle WebLogic Server 12.2.1.4

"Dynamic Clusters" section.

The documentation describes how to create and configure dynamic clusters without any mention of architectural restrictions

confirming they can be used in any cluster topology. This refutes option A.

3. Oracle® Fusion Middleware

Developing Enterprise JavaBeans

Version 2.1

for Oracle WebLogic Server 12.2.1.4

"How a Client Invokes an EJB" section.

This document describes the mechanisms for remote clients (like a servlet in a web tier) to look up and invoke methods on EJBs

which is the fundamental communication pattern in a multitier architecture. This refutes option B.