DNS telemetry, which domains are queried, how often, and when the raw material for spotting risk is, but raw logs are mostly noise. A SIEM collects, correlates and alerts to turn scattered logs into signals, and a baseline of normal behaviour is what lets the genuinely unusual stand out.

DNS telemetry reveals three things in every query. Domains queried where devices are trying to reach. Query volume: how much and how often. Timing and patterns when and how regularly. Read together, domain, volume and timing turn raw lookups into a story about behaviour. ‘Telemetry’ is just the stream of data DNS produces, and the patterns in it are the raw material for spotting risk, but raw material is overwhelming.

Bringing it together is the job of a SIEM. It collects centralising logs from many sources in one place. It correlates, linking related events together. And it alerts flagging the genuinely unusual. A SIEM (Security Information and Event Management) does the heavy lifting so analysts see signals, not raw noise. Without it, DNS logs from across the estate sit scattered and unreadable; with it, related events are joined up and the unusual is surfaced for attention.

The noise-versus-signal contrast turns on one thing: a baseline. Noise is when all looks the same: raw, unfiltered logs, no baseline of normal, nothing stands out, and real signals are missed. Signal is when the odd stands out: logs in a SIEM, a known baseline of normal, anomalies visible, and useful alerts fire. A baseline of normal behaviour is what lets the unusual, a strange domain, a volume spike register as a signal worth investigating, rather than disappearing into the flow of ordinary traffic.

Two practical cautions. First, alert fatigue is a real danger: alerts tuned against a baseline fire on what’s genuinely unusual, but un-tuned alerts fire constantly, cause fatigue, and get ignored. The worst outcome is because a drowned-out real alert is as bad as no alert. Second, correlation across sources adds power: correlating DNS with endpoint data reveals connections that neither shows alone the core value a SIEM provides. Reading DNS signals well means baselining, tuning alerts, and correlating, not just collecting.