What is a quick method to stop threats at the DNS level according to Zscaler?

Blocking certain Advanced Security URL categories is an effective method to stop threats at the DNS level. This approach targets specific types of web content that are often associated with malicious activity, such as phishing sites, malware distribution domains, or known bad actors. By identifying and blocking these categories, organizations can prevent access to harmful sites before any malicious content can be downloaded or executed on the network.

This method is proactive in nature; rather than waiting for a threat to manifest, it establishes safeguards at the DNS level to limit exposure to dangerous resources. This is critical because DNS is integral to network communications, and threats often exploit DNS for delivering malicious payloads or conducting attacks.

Other options, such as allowing all types of DNS traffic, would increase vulnerability, as it permits access to all websites regardless of their security status. Disabling DNS filtering rules completely and allowing all traffic for analysis would also expose the network to numerous risks, counteracting the objective of threat prevention. Thus, selective blocking of harmful URL categories stands out as the most strategic choice for mitigating risks at the DNS level effectively.