Free S90.02 sample questions

Correct answer: False

This statement is false. In the PaaS model, the cloud provider manages the underlying infrastructure, including the physical hardware, networking, and the operating system. The cloud consumer is responsible for deploying and managing their applications and data, but not the OS itself. The provider handles OS patching, updates, and maintenance. This abstraction is a key benefit of PaaS.

Correct answers: xs:complexType; xs:sequence

The `xs:complexType` element is the primary mechanism in XSD for defining custom data structures that can contain other elements, attributes, or a combination of both.

The `xs:sequence` element is a compositor used within an `xs:complexType` to specify that the child elements must appear in the defined order. It is a key part of defining the structure.

Correct answer: Safety

The primary violation is of the 'safety' property. Safe HTTP methods, like GET and HEAD, are defined as those that do not alter the state of the resource on the server. They are intended for read-only operations. Using GET to perform a destructive action like deleting an account is incorrect and dangerous, as crawlers, proxies, or pre-fetching mechanisms could inadvertently trigger the action. The correct method for deletion would be HTTP DELETE.

Correct answer: One-Way

The One-Way MEP is ideal for this 'fire-and-forget' scenario. The service consumer sends a message to the service provider and does not expect a response. The interaction is complete once the message is sent. This decouples the client from the processing workflow, allowing for asynchronous communication. Request-Response would imply the client waits for a reply.

Correct answer: Rapid Elasticity

Rapid elasticity is the ability to provision and release computing resources elastically, in some cases automatically, to scale rapidly outward and inward commensurate with demand. This directly addresses the need to handle traffic spikes during sales and scale down during quiet periods, thereby optimizing performance and cost. Measured Service is related, as it enables the pay-per-use model that makes elasticity financially viable, but elasticity is the core capability for adjusting capacity.

Correct answer: Passive Service Agent

Service agents are classified as passive or active. A passive agent, such as a monitoring or logging agent, observes and processes message content without modifying it. An active agent, such as a data transformation or validation agent, actively modifies the message content. Since this service only logs the message and does not alter it, it is a passive service agent.

Correct answer: The and elements.

The abstract definition in WSDL consists of ` `, ` `, and ` `. These define the data types, the messages exchanged, and the operations, respectively, without specifying any protocol. The concrete definition consists of the ` ` (which specifies the protocol, like SOAP over HTTP) and ` ` (which specifies the endpoint address). Therefore, the ` ` and ` ` elements provide the concrete implementation details.

Correct answer: enum

The `enum` keyword in JSON Schema is used to restrict a value to a fixed set of values. It must be an array with at least one element, where each element is unique. To meet the requirement, the schema would include `"enum": ["DEBUG", "INFO", "WARN", "ERROR"]`. The `pattern` keyword uses regular expressions, and `const` restricts the value to a single specific value, not a set.

Correct answer: 201 Created

The `201 Created` status code is the most appropriate response for a successful POST request that results in the creation of a new resource. The server should also include a `Location` header in the response, containing the URI of the newly created resource (e.g., `/orders/123`). While `200 OK` indicates success, `201 Created` is more specific and idiomatic for resource creation.

Correct answers: Stateless; Uniform Interface

The stateless constraint means that each request from a client to the server must contain all the information needed to understand and process the request. The server should not store any client context between requests.

The uniform interface constraint simplifies and decouples the architecture. It consists of four sub-constraints: resource identification (URIs), resource manipulation through representations (e.g., JSON), self-descriptive messages, and hypermedia as the engine of application state (HATEOAS).