Exam Drupal-Site-Builder Topic 1 Question 23 Discussion

Actual exam question for Acquia's Drupal-Site-Builder exam
Question #: 23
Topic #: 1

Your site is experiencing high page load times. When looking at recent log messages, you noticed a high frequency of "page not found" messages from a single IP address. On further investigation, the IP address was tracked to a suspicious crawler.
Which step will you take to improve site performance?

A. Enable "Ban" module and configure it to ban the IP address found in the logs. B. Visit the Performance administration page, select "enable fast 404s". C. Visit the Search administration page, select redirect 404s to the search page. D. No action needed, Drupal automatically blocks any such suspicious visitors.

Suggested Answer: B Vote an answer

The best answer is B because the problem described is a large volume of 404 Page Not Found requests generated by a crawler, and Drupal core includes Fast 404 handling specifically to reduce the performance cost of such requests. In Drupal 10 and Drupal 11, core contains a Fast404ExceptionHtmlSubscriber and configuration under system.performance:fast_404 . Drupal's API documentation explains that Fast 404 returns a minimalist 404 response for matching requests instead of going through the full themed page handling, which lowers processing overhead for repeated invalid URL requests.
Option A may help block a bad actor, but banning one IP address is not the Drupal-documented performance feature aimed at reducing the cost of many 404s. Option C would worsen the situation because redirecting missing pages to search adds extra processing rather than reducing it. Option D is incorrect because Drupal does not automatically block suspicious visitors just because they generate many 404 log entries. Also, Drupal
10 release notes explicitly note that Fast 404 is a core capability and that separate legacy settings.php-based handling is no longer the recommended approach.

by Lennon at Sep 04, 2026, 11:48 PM

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