AEM Sites Developer Professional Mock Test 3 — AD0-E128

Mock test disclaimer: This is an independent sample practice test created by AEM CQ5 Tutorials. It is not created, endorsed, approved, sponsored, or affiliated with Adobe. All questions are original practice questions based on publicly available Adobe certification objectives and official AEM documentation. They are not actual, leaked, recalled, copied, or reproduced Adobe certification questions.

Passing score: 70% Questions per attempt: 30

Question 1

An author sees a generic error on a page after a publish. Which log should be checked first?

A. The browser's bookmark list B. The error.log on the Publish instance for the stack trace and time of the failure C. The licence agreement D. The Dispatcher's rewrite map only

Question 2

Activated content is missing on Publish but present on Author. What should be checked?

A. The replication agent status and queue, including any errors on the transport B. The author's profile picture C. The number of pages on the site D. The name of the template

Question 3

A custom validation runs before or after the content request is processed. How can this be determined?

A. Use the request logs and the order of the filter or servlet in the logs with debug logging enabled B. Assume it always runs first C. Read the page source only D. Check the browser's version

Question 4

A team needs faster rendering of a heavy component that calls an external API. Which approach is recommended?

A. Cache the API response with a bounded time-to-live and handle failures gracefully B. Call the API from every browser directly C. Disable the component on Publish D. Store the API response in the page title

Question 5

A developer must restrict an action to users in a specific group. Where should the rule be enforced?

A. Only in the client-side JavaScript B. Only in the HTML of the page C. In the repository permissions and in the code that performs the action, with the check on the server side D. In the browser cookie

Question 6

A Sling Model needs an optional property that may be missing. What should the model do?

A. Throw an exception and stop the request B. Return an empty page to the author C. Create the property automatically on read D. Mark the injection as optional with a default value so the component still renders

Question 7

A design property should apply to all child components of a container. Which approach is cleanest?

A. Repeat the setting in every child component B. Inherit the setting from the parent container's design or style configuration C. Set the value inside each page's content D. Use an inline style in the HTML of the container

Question 8

A cache-busting strategy is needed for images that change often. Which approach is best?

A. Disable all caching for images B. Use versioned file names or query parameters generated at build or publish time C. Rename the images manually each time D. Store the images in a database column

Question 9

A content package must be installed on several instances in a fixed order. How should this be managed?

A. Install them in random order and retry on failure B. Define the order in a package dependency or build sequence and install the packages in that sequence C. Copy each package by hand to the file system D. Install only the largest package

Question 10

A Maven build fails because two modules define the same class. What is the most suitable fix?

A. Remove the duplicate class from one module and keep the shared code in a single common module B. Add both modules to the bundle as separate copies C. Delete the Maven cache and retry only D. Rename one class to a random name

Question 11

A component must use a service that is only available in one run mode. What is the best design?

A. Use an optional reference to the service and disable the feature when it is unavailable B. Force the service to start in every run mode C. Copy the service code into the component D. Use a global static variable

Question 12

A page template must allow only specific components in one container and a wider set in another. How is this configured?

A. Use one allow list for the whole page B. Let authors choose freely in each container C. Configure the containers in the browser D. Configure separate policies or component allow lists for each container within the template

Question 13

A proxy server returns a 403 for a valid asset request. What should be checked first?

A. The size of the page title B. The Dispatcher filter rules that match the request path and file extension C. The number of tags on the page D. The author's username

Question 14

A Sling Job is queued but never processed. Which setting should be checked first?

A. The number of pages in the site B. The colour of the admin console C. The job topic and that a consumer is registered for the same topic D. The language of the content

Question 15

A reusable utility is needed across several bundles. What is the recommended packaging?

A. Copy the utility class into every bundle B. Put the shared code in a separate bundle and import its packages in each consumer C. Put the utility inside the content package only D. Store the utility in a text file on the server

Question 16

A model must expose the current page title and handle the case where the title is missing. What is the best practice?

A. Throw an unchecked exception B. Return a fallback value from the model method when the title is null C. Return an empty string without any check D. Create a new page with a default title

Question 17

A component's clientlib includes a large script that is only needed on one page. What is the best improvement?

A. Move the script into the page head for all pages B. Inline the script into every component C. Split the script into its own clientlib and load it only through the component that needs it D. Load the script from a third-party CDN without caching

Question 18

A deployment must be rolled back quickly without losing content. What is the best approach?

A. Delete the repository and rebuild B. Edit the code directly on Publish C. Keep the previous version of the package and redeploy it while preserving the repository content D. Remove the Dispatcher

Question 19

A repeated job creates duplicate nodes when it fails and retries. What is the best fix?

A. Disable retries completely B. Create the node with a random name each time C. Delete the job's logs D. Check whether the node exists before creating it, so the retry does not duplicate content

Question 20

A component must support a new property added in a later release without breaking older content. How should the model handle it?

A. Require the property on every page B. Delete older content and recreate it C. Use an optional injection with a default, so older content without the property still works D. Ignore the property entirely

Question 21

A proxy must cache a JSON endpoint for a short time only. Which configuration best meets this?

A. Set the cache time for that path in the response headers with a short expiry and a matching Dispatcher rule B. Cache the endpoint forever C. Disable all caching for the whole site D. Cache only on the author instance

Question 22

A design setting must be consistent across all sites that share a template. What is the best approach?

A. Set the value on every site separately B. Set it in the browser for each author C. Define the setting in the shared design or template configuration that all sites inherit D. Put it inside every page's text

Question 23

A servlet must be protected so that only authenticated users can call it. Where should the check be made?

A. Only in the browser's JavaScript B. Nowhere, because servlets are internal C. In the page HTML D. In the servlet using the request's user and an explicit permission check

Question 24

A deployment to Dispatcher changes a rewrite rule that breaks a route. What is the best way to verify the fix?

A. Test only on the author instance B. Publish the change directly and wait for complaints C. Test the route on a staging Dispatcher with the same rules before production D. Test only on a developer laptop without Dispatcher

Question 25

A model reads an author-entered number that must fall within a range. Where should the range check live?

A. Only in the browser's JavaScript B. In the Dispatcher rewrite rules C. Nowhere, since the dialog already limits input D. In the Sling Model, with a clamped or defaulted value when the stored number is out of range

Question 26

A component needs a child-resource lookup that returns null for a missing node. What is the safest pattern?

A. Let the NullPointerException reach the user B. Create the missing node on every request C. Return the parent page's content instead D. Check the child resource for null before reading its properties and render nothing when it is missing

Question 27

Two templates share a footer experience fragment but need different variants. How should this be designed?

A. Use one experience fragment with variant masters and reference the required variant from each template B. Copy the fragment for each template C. Hard-code the footer into each template D. Use a separate site for each template

Question 28

A component's dialog should hide a field unless another field is set to a specific value. How is this done?

A. Use dialog field conditions or show/hide rules on the controlling field B. Remove the field and add it later with a script C. Ask authors to ignore the field D. Hide the field with a CSS rule on the author page only

Question 29

An image rendition is missing on the Dispatcher after a change to the image profile. What should be checked first?

A. The number of text lines in the component B. The author's preferred language C. The size of the navigation menu D. Whether the rendition is generated on Publish and the Dispatcher cache for that path is invalidated

Question 30

A background job must avoid overloading the repository when it processes many nodes. What is the best approach?

A. Load all nodes into memory and save once B. Process the nodes in batches and commit or save between batches C. Run the job on every node at the same time D. Disable the job when the site has many pages

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