This report outlines five vital signs of network security health: new clients and servers, which may signal rogue systems; unusual scanning activity, indicating reconnaissance or worm activity; internal reconnaissance, such as scanning for file shares; volume-based activity spikes, possibly denoting DDoS attacks; and high outbound data volumes, which may suggest data exfiltration. Like medical vital signs, sudden changes in these metrics—not just their presence—can indicate problems. Monitoring these signs continuously provides early warning and helps organizations detect and address threats before they escalate.

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