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IBM Cloud Platform Application Development v2 Sample Questions:

1. Which statement is true regarding horizontal scaling in IBM Cloud Foundry applications?

A) Horizontal scaling increases the Memory (RAM).
B) Horizontal scaling is achieved by increasing the resources available to an application instance.
C) Horizontal scaling is not available.
D) Horizontal scaling is achieved by increasing the number of application instances.

2. What is the output of the cf apps command?

A) a list of all the running applications on IBM Bluemix PaaS with application owner ID
B) a list of all the applications in the developer's space with the name and resource utilization
C) a list of services bound to each application for the developer's organization
D) a list of all the applications and services for the developer's organization

3. A developer is building an IBM Cloud Foundry application that uses an enterprise service available as a RESTful API. Following security best practices, how should credentials for the service be stored?

A) In a properties file in the same code repository as the application
B) As constants in the application source code
C) As environment variables in a user-provided service
D) In a file located within a custom buildpack

4. An e-commerce web site currently consists of a 2-tier web application (app server + DB) deployed on IBM Cloud: 1 webapp instance for the Java front-end and 1 Cloudant instance for the DB.
Immediately after deployment on Bluemix, the application fails to start. When reviewing the application logs the following excerpt is found:
App instance exited with guid 549fb650-8ded-43aa-b895-f230692be4b0 payload:
{... "index"=>0, "reason"=>"CRASHED", "exit_status"=>255,
"exit_description"=>"out of memory",...}
How can the problem be fixed?

A) Use the IBM Static Analyzer for Bluemix to run a static code analysis on the entire web application to identify memory leaks.
B) It looks like an internal Bluemix problem, open a ticket with IBM Support so they can fix it for you.
C) Not enough memory is allocated to the application. Increase the memory either via the command line, in the manifest.yml file, or through the Bluemix console.
D) The application is overloaded with more requests than it can handle. Increase the number of instances either via the command line, in the manifest.yml file or through the Bluemix console.

5. A utility company has an existing web application developed in Java for Websphere Application Server and is currently running on premises. They want to move that application to IBM Cloud.
The existing application is stateful and maintains persistent session data using JavaEE standard HTTP sessions. Which Bluemix service should be used to avoid making any change to the application code and maintain the statefulness of the application?

A) MySQL
B) Session Cache
C) Object Storage
D) Compose for Redis

Solutions: