Free Adobe AD0-E123 Practice Exam with Questions & Answers

The recommended approach to use AEM Core Components is by creating proxy components. Proxy components are essentially wrapper components within your own project that reference the core components. This practice allows developers to inherit functionality from the core components while being able to override and extend it as necessary. By using proxy components, developers can ensure that any custom styles and configurations are preserved even when the core components are updated in the future.

When customizing a core component in AEM, setting thesling:resourceSuperTypeproperty in the new component's definition allows it to inherit features from an existing core component. This property points to the resource type of the core component that is being extended or customized. By doing so, the new component inherits the core component's logic and rendering scripts but can be customized further according to project-specific requirements.

• Option A,sling:resourceType, is used to define the primary resource type for a component and does not indicate inheritance.
• Option B,jcr:title, is used to give a human-readable title to a node in the JCR and is unrelated to component inheritance.

TheCQ_JVM_OPTSparameter in an AEM start script is used to set options for the Java Virtual Machine (JVM). The setting'-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n'enables the Java Debug Wire Protocol (JDWP) agent for the JVM, allowing a debugger to attach to it. Thesuspend=nflag means the JVM will not suspend at the start but will wait for a debugger to connect on port8000. This effectively runs the AEM instance in debug mode, which is useful for development and troubleshooting.

• Option B is incorrect because thesuspend=nsetting means the JVM does not suspend on start-up.
• Option C is incorrect because this parameter is for debug mode, not for specifying the run mode of the AEM instance.

The Discovery Service is an offloading-related service used by each AEM instance to connect to AEM Topology Connector. The Discovery Service is part of the Sling Discovery framework, which is responsible for detecting and managing the topology of AEM instances. It enables instances to discover each other and establish a clustered topology, which is essential for load-balancing, failover, and other distributed operations.

• Option A, "Cluster Service," is not a standard term used in AEM for connecting to the Topology Connector.
• Option C, "Topology Connector Service," is a slightly misleading term; the correct term is Discovery Service, which performs the role described.

The request log in AEM records details about requests processed by the AEM instance, including transaction response times. This log is useful for developers when they need to analyze the performance of page requests, including how long each page takes to load. The request log can typically be found in thelogsdirectory of the AEM installation and may be namedrequest.log.

• stdout.logtypically contains the standard output of the AEM process and is not specific to request transactions.
• audit.logis used to log user actions for auditing purposes and does not include transaction response times.

When it comes to rendering the content of an Experience Fragment for third-party applications to access directly via a URL, and in a browser-friendly format, thetextselector is used. This selector causes AEM to render the Experience Fragment as plain text, which is typically what a third-party application would require if it needs to consume the content directly without any associated styling or scripts.

• Option B,noCss, is not a standard selector for this purpose.
• Option C,plain, is not the correct selector for rendering Experience Fragment content in AEM. Theplainselector might suggest a text/plain MIME type, but in AEM, the correct selector for retrieving the text content of an Experience Fragment istext.

When modifications are made to a workflow model in AEM, they must be saved and synchronized with the running instance of AEM. If a user starts a workflow and does not see the recent changes or workflow steps, it could be because the workflow model was not synced in runtime. This means the running instance of AEM is not yet aware of the changes, and as a result, the workflow instance uses the old version of the workflow model.

• Option B is incorrect because permissions would not cause the recent changes to be unavailable; they would more likely prevent the user from starting the workflow at all.
• Option C is also incorrect because while errors in subsequent steps could potentially stop the workflow from proceeding, they would not prevent new steps from appearing in the workflow instance if they were properly saved and synced.

In the dispatcher configuration, to allow the caching of requests with an authorization header, the property/cacheAuthorized "true"must be set. By default, the dispatcher does not cache responses to requests that include authorization headers to prevent private or user-specific data from being incorrectly cached and served to other users. Setting this property totrueoverrides the default behavior, enabling the cache to store and serve responses even for requests that contain an authorization header.

When using a Network File System (NFS) for AEM,CachingFileDataStoreis recommended because it caches binary data on the file system and stores only references to the binaries in the repository. This can be beneficial for performance, as it reduces the latency associated with reading binaries over the network, especially when NFS is being used. The caching layer helps in optimizing read operations by keeping a local cache of frequently accessed data.

• S3DataStoreis used when integrating with Amazon S3 for storage.
• FileDataStoredoes not provide caching capabilities and would not be as efficient asCachingFileDataStorewhen using NFS.

Sling Models is an AEM feature that allows developers to map JCR data to Java objects. It is a part of the Sling framework, which AEM is built on top of. Sling Models facilitate the decoupling of content from the rendering layer, making it easier to work with data in AEM components. By defining simple POJOs (Plain Old Java Objects) with annotations, developers can map properties from the JCR (Java Content Repository) to fields in a Java class, enabling a straightforward and type-safe way to handle the content. This is especially useful when creating components such as 'Hello World', where dynamic data needs to be fetched from the JCR and rendered on the page.

• HTL and Dialogs (Option A) are used for rendering components and creating editable fields in the component dialogs, respectively, but do not facilitate data mapping to Java variables.
• Client-Side Libraries (Option B) are used to manage client-side resources like JavaScript and CSS but are not involved in JCR to Java variable mapping.