Logs are evidence, not just storage
Firewalls, servers, applications, endpoints, DNS, VPN and identity systems each record part of an incident. Central collection creates a common timeline and reduces the risk that local logs are overwritten or lost.
Normalisation and correlation
Raw events use different formats and fields. Normalisation aligns timestamps, addresses, users, actions and outcomes. Correlation then connects authentication failures, suspicious DNS requests, blocked traffic, privilege changes and data transfers into a meaningful sequence.
Detection and investigation
Useful dashboards focus on behaviour: top talkers, unusual destinations, repeated denials, new applications, geographic anomalies, VPN activity and policy changes. Analysts should be able to pivot from a summary to the original event quickly.
Engineering fundamentals
Synchronise time, encrypt transport, buffer during network loss, monitor ingestion gaps, restrict access and define retention by source and purpose. Protect archives and record administrative searches and exports.
From visibility to response
Logs create value when alerts have owners, priorities and playbooks. Connect findings to ticketing, incident response and configuration improvement.
