In Zscaler, which technology helps in preventing unauthorized access to cloud applications?

The correct answer is Cloud Access Security Broker (CASB), as this technology plays a pivotal role in securing cloud applications by acting as an intermediary between users and these applications. CASB solutions provide visibility, compliance, data security, and threat protection when users access cloud services. They enable organizations to enforce security policies and protect sensitive data by identifying and mitigating risks such as unauthorized access, data leaks, and potential threats from shadow IT.

CASBs facilitate better monitoring and security of user activities, ensuring that only authorized users can access cloud applications. They accomplish this by assessing the security posture of cloud services and ensuring that security policies are consistently applied across all user interactions with these services.

Other technologies mentioned may also provide security and control, but they do not specifically address the layered security and direct intervention that a CASB offers for cloud applications. Virtual Box Technology, for instance, is primarily related to virtualization rather than security for cloud applications. Traditional gateways typically focus on securing local network traffic and may not have the integrated capabilities necessary for comprehensive cloud application security. Web filtering is key for controlling access to different websites and may block malicious sites, but it does not equate to the deeper insights and protections provided by a CASB when it comes to cloud applications.