Five DNS practices that prevent avoidable outages

DNS is a shared dependency: a small configuration mistake can appear as a failure in email, authentication, databases, web applications, or monitoring. The following practices reduce that risk. 1. Use more than one authoritative or recursive resolver where the design requires it. Avoid making a single server the only path to a critical name. 2. Document zone ownership and change approval. Teams should know who can change records, where changes are logged, and how they are reversed. 3. Choose TTL values intentionally. Very low values increase query volume; very high values slow down planned changes and recovery. 4. Monitor resolution from the networks where users and services operate. A record can look correct on an administrator workstation and still fail at a branch site or inside a workload network. 5. Test DNS as part of change validation. Confirm forward lookup, reverse lookup where relevant, conditional forwarding, and the application connection itself. Reliable DNS is built through routine discipline, not emergency troubleshooting.