What mechanism is used to block external files containing JavaScript or images from loading in a browser?

The correct answer is based on the use of content filters, which are designed to prevent certain types of content from loading or accessing a network. Content filtering can block external files, including JavaScript and images, by analyzing the content being requested by users and applying predefined rules or policies.

Content filters work by examining the data packets as they enter or leave a network. They can be configured to allow or deny content based on specific criteria, which may include the type of file, the source of the request, or the website being accessed. For instance, if a network administrator wants to block all external JavaScript files for security reasons, the content filter can be set to deny any requests for files with a .js extension from unapproved sources.

This is particularly important in a security context, as malicious scripts often exploit vulnerabilities in browsers or web applications, potentially leading to attacks such as cross-site scripting (XSS). By utilizing content filters, organizations can enhance their security posture by preventing the loading of potentially harmful external files.

In distinguishing this from other options, network access control primarily focuses on managing who and what can access the network, rather than controlling the specific content types. Antivirus software is designed to detect and respond to malware but does not typically filter web content in