How to implement DNS security at scale. Are you struggling to manage fragmented DNS settings that leave your network vulnerable to phishing and data leaks? Let's discuss how to implement DNS security at scale to protect your entire network. Before we begin, be sure to subscribe to NinjaOne's IT Video Hub and our YouTube channel for more tech content like this. Selecting your resolver and policy model. Setting a strong foundation requires aligning your DNS strategy with specific security, privacy, performance, and compliance goals. First, choose recursive resolvers that support DNS filtering and encryption protocols like DoH or DoT. Next, define baseline policies to block high-risk categories like malware and phishing. Then, establish clear allowlist and denylist procedures, including how exceptions are requested and managed, and plan for failover and captive portal behavior. Finally, create a comprehensive policy profile to ensure consistent governance across all clients. Piloting for performance and compatibility. Testing your policies with a small group helps you identify potential security, performance, and compatibility issues before a broad rollout. First, select a representative pilot group to measure query latency, block rates, and track DNS-related ticket volume. Next, enable DNS logging, sample security events, and monitor for application compatibility issues. Then, capture necessary exceptions and fine-tune your DNS policies and encryption profile early. Finally, use this phase to validate security impact while limiting the risk of widespread disruption. Enforcing DNS security across endpoints. To ensure consistent enforcement, secure DNS must become the path of least resistance for your users. Push DoH or DoT settings via GPO or MDM across Windows, macOS, and mobile. Block outbound plaintext DNS wherever practical at the network level to prevent policy bypasses and require resolution through approved resolvers. Configure VPN and roaming profiles so that approved corporate DNS settings and encryption persist when devices are off-network. Provide IT support scripts to verify DNS encryption, resolver reachability, and policy status during troubleshooting. Operational monitoring and remediation. Effective long-term security relies on your ability to turn DNS telemetry into actionable intelligence. Monitor telemetry for spikes in blocked threats or unusual destination patterns. Correlate DNS events with EDR and firewall logs for deeper incident investigations. Adjust allowlists quickly to resolve false positives and maintain operational flow. Track outcomes such as blocked threats, encrypted DNS coverage, query latency, resolver uptime, exception aging, and DNS-related help desk volume. Building a strong DNS defense is a continuous process that evolves alongside your organization's growth and the shifting threat landscape. Maintaining a layered approach with encryption and consistent reporting allows you to prove the value of your security posture to stakeholders every month. For more information, check out our official blog post on how to implement DNS security at scale, linked in the description below.