1Z0-133 practice question 22 of 25

You are creating and configuring a cluster by using the administration console. Which two statements are true?

Answer options

A: All servers that will be part of the cluster must be created before the cluster is created.

B: You must pick the cluster messaging mode. Correct answer

C: Even though you create a non dynamic cluster, you can change it to a dynamic cluster later. Correct answer

D: Once the cluster is created, you cannot change its messaging mode.

E: The administration console does not provide a way to manually migrate singleton services. It must be set up to be done automatically or by using WLST.

Correct Answer:

B. You must pick the cluster messaging mode.; C. Even though you create a non dynamic cluster, you can change it to a dynamic cluster later.

Explanation

When creating a WebLogic Server cluster using the Administration Console, you are required to select a messaging mode—either unicast or multicast—which defines the communication protocol for cluster members. This is a fundamental step in the cluster configuration process. Additionally, WebLogic Server offers the flexibility to convert a configured (non-dynamic) cluster into a dynamic cluster after its initial creation. This conversion is accomplished by creating a server template from one of the configured servers and then modifying the cluster to use this template for managing its members.

Why Incorrect

A. Servers can be created during the cluster creation wizard; they are not required to exist before starting the process.
D. The cluster messaging mode (unicast or multicast) is a configurable attribute that can be changed after the cluster is created.
E. The Administration Console provides a direct interface for manually migrating singleton services and migratable servers between cluster members.

References

1. Oracle Fusion Middleware

Administering Clusters for Oracle WebLogic Server

12c (12.2.1.3.0)

Chapter 3

"Creating and Configuring Clusters".

Reference for B: In the section "Create a cluster

" step 6 of the procedure states

"Select the messaging mode for the cluster: Unicast or Multicast." This confirms the selection is a required step.

Reference for D: In the section "Unicast or Multicast?"

the documentation states

"You can change the messaging mode at any time." This contradicts option D.

Reference for A: The section "Methods of Creating and Configuring Clusters" describes creating servers as part of the cluster configuration

invalidating the claim that they must be created beforehand.

2. Oracle Fusion Middleware

Administering Clusters for Oracle WebLogic Server

12c (12.2.1.3.0)

Chapter 4

"Understanding Dynamic Clusters".

Reference for C: The section "Converting Configured Clusters to Dynamic Clusters" explicitly states

"You can convert a configured cluster to a dynamic cluster by creating a server template from one of the configured servers in the cluster..."

3. Oracle Fusion Middleware

Administering Clusters for Oracle WebLogic Server

12c (12.2.1.3.0)

Chapter 6

"Service Migration".

Reference for E: The section "Manually Migrating a Pinned Service to a Different Server" provides instructions for performing manual migration using the Administration Console

directly refuting option E.

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