AEM Sites Developer Professional Mock Test 1 — AD0-E128

AD0-E128ProfessionalMock / Sample Test

Important: These are independent mock/sample questions created for learning and certification preparation. They are not Adobe exam questions and do not guarantee passing any Adobe certification.

Question 1

A team needs a project-specific variation of an AEM Core Component while retaining future Core Component updates. What is the preferred approach?

A. Copy the Core Component source into /apps B. Create a proxy component under /apps using sling:resourceSuperType C. Modify the component under /libs D. Create a JSP that includes the Core Component HTML

Question 2

An HTL component must render a title entered by an author. Which approach best preserves HTL’s default XSS protection?

A. Print the value using an unsafe context B. Build HTML markup in the Sling Model and return it unescaped C. Output the authored value normally in HTL D. Disable HTML filtering in the component dialog

Question 3

A public site references a client library that is configured under /apps. What client library property is required for Dispatcher-served client libraries?

A. allowProxy=true B. embed=true C. defer=true D. minify=true

Question 4

Authors must choose only approved values for a component design setting, and the setting must apply consistently to all components using a template. Where should the developer configure it?

A. Page properties B. Content policy for the editable template C. A user profile property D. The component’s dialog only

Question 5

A servlet should handle requests for resources of resource type myproject/components/page/article. Which registration strategy is best?

A. Register only a fixed servlet path B. Register by resource type, selector, extension, and method as needed C. Put the servlet under /libs D. Create a workflow launcher

Question 6

An OSGi service configuration must differ between Author and Publish. How should it be packaged?

A. Hard-code the environment value in Java B. Put one configuration in /libs C. Use run-mode-specific OSGi configuration folders D. Store it in a component dialog

Question 7

A query against a large content subtree is slow and frequently used by the application. What is the best first remediation?

A. Increase the servlet timeout B. Add a custom Oak index designed for the query, then validate it C. Run the query repeatedly to warm it up D. Move all content to /content/dam

Question 8

A change is activated successfully on Author but does not appear on Publish. Which evidence should the developer inspect first?

A. The replication/activation queue and relevant replication logs B. The component’s dialog XML C. The Maven wrapper version D. Content policy configuration

Question 9

A custom workflow must start automatically whenever a page is created below a specific site path. What should be used?

A. A workflow launcher with an appropriate path and event condition B. A Dispatcher filter rule C. A client library category D. A replication agent

Question 10

A developer needs to create a standard AEM project with recommended Maven modules and structure. What is the preferred starting point?

A. Manually create one bundle in CRXDE Lite B. Generate the project using the current AEM Maven Archetype C. Copy an arbitrary old project from production D. Create all folders directly under /libs

Question 11

A page is not cached by Dispatcher even though its URL is permitted. Which configuration area should be examined for cache eligibility?

A. The Dispatcher cache rules, including /rules and invalidation behavior B. Only the authoring dialog C. The page’s version history D. The workflow inbox

Question 12

A component needs data from a service and must be easy to unit test. Which pattern is most appropriate?

A. Put all business logic in HTL B. Use a Sling Model that adapts the resource/request and injects the service C. Add Java code to the dialog XML D. Query JCR directly from JavaScript in the browser

Question 13

A developer needs reusable structured content that can be delivered to several channels, including a headless consumer. Which feature is the best fit?

A. Experience Fragment only B. Content Fragment with a Content Fragment Model C. Static Template D. Client library

Question 14

A Dispatcher security review finds that a broad filter permits requests that should never reach Publish. What is the safest correction?

A. Allow all requests and rely on the browser B. Use a deny-by-default strategy and explicitly allow required request patterns C. Remove all filters D. Cache every request

Question 15

A client library change is not visible in a browser after deployment. What is a useful first diagnostic step?

A. Inspect the generated client library URL and browser network/cache behaviour B. Delete the entire repository C. Change the page template type D. Disable Dispatcher permanently

Question 16

A component should show a fallback image when the asset is missing from DAM. What is the most maintainable approach?

A. Hard-code the fallback in the CSS B. Use a Sling Model or HTL expression to provide a default asset path when the authored field is empty C. Disable the asset field in the component dialog D. Store fallback markup in a page property

Question 17

During a release, a custom page template needs different design settings between staging and production. What is the best method?

A. Put separate values in environment-specific content policies or OSGi config B. Use page-level JavaScript overrides C. Hard-code stage values in the template JSP D. Duplicate the template node under /libs

Question 18

A developer needs to ensure a property is indexed and only results for a known subtree are returned. What should be prioritized?

A. Add a custom Oak index that matches the exact path and property B. Disable all page caches C. Change the page to use a static template D. Move the content to /var

Question 19

A content author edits a component but the new values do not save after a rollout. What is the best first check?

A. Inspect the content policy and component dialog constraints B. Remove the page from Publish C. Restart the Author instance D. Edit /libs directly

Question 20

A team wants to avoid dependency drift between local development and CI builds. Which practice is best?

A. Lock dependency versions in the build file and run the same build pipeline in CI B. Install the latest packages manually on every workstation C. Commit generated files only D. Use different Java versions on each machine

Question 21

An author reports a page renders a generic error after a recent deployment. What is the most useful first diagnosis?

A. Check logs for the requested path and any thrown exceptions in the relevant component B. Delete the page and recreate it C. Disable the site’s Dispatcher filter D. Rebuild all client libraries

Question 22

A team needs to track whether a custom workflow is firing for all new pages under a site branch. What mechanism is best?

A. Add a workflow launcher condition with the appropriate path and event checks B. Add a page property to all templates C. Trigger it from a browser script on Publish D. Modify the Dispatcher config

Question 23

A component is included by the template but renders nothing on Publish. What should be checked before editing the component code?

A. Replication status, cache headers, and whether the authoring path is actually included in the publish content tree B. The browser’s bookmarks C. The DAM metadata only D. The website footer text

Question 24

A developer needs to enforce an approved list of options for a component property. What is the correct design?

A. Add a fixed list in the dialog constraints or content policy used by the component B. Hard-code the list in the CSS file C. Store the values in the browser local storage D. Use free-text values and validate in HTML

Question 25

A component must read from a service at request time while staying testable. Which pattern is best?

A. Inject the service into a Sling Model and keep the access logic in the model B. Add direct JCR reads inside HTL C. Store the service object in the page property D. Duplicate the service call in every template

Question 26

A site uses multiple page templates and authors need consistent section widths. What is the most maintainable configuration?

A. Create a shared content policy or template-level design setting reused by those templates B. Write CSS selectors for every page path C. Store widths in each page property D. Add the widths to a workflow model

Question 27

A developer notices a custom servlet is not reached for some selectors. What should be checked first?

A. The servlet registration matches the resource type, selectors, extension, and HTTP method B. Whether the repository has been renamed C. The browser cache TTL D. The page title

Question 28

A multi-select configuration for allowed components should prevent accidental over-permission. What is the recommended approach?

A. Keep the allowlist narrow and review it as part of the template policy B. Allow every component in the template C. Put the list in the browser session D. Use a workflow to calculate it at runtime

Question 29

A project uses editable templates and authors complain that one region shows the wrong design settings. What should be checked?

A. The content policy assigned to the template’s layout region B. The folder name of the site root C. The asset metadata only D. The user profile created date

Question 30

A team wants to validate whether a custom AEM integration fails before or after the content request is processed. Which layer should be examined?

A. Request filtering, service invocation, and relevant logs around the request path B. The browser theme setting only C. The favicon metadata D. The site’s RSS feed

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