What is NetFlow in Cybersecurity?
Networking & Infrastructure
Version 1.0 · Published April 2026 · Last verified April 2026
NetFlow is a Cisco-developed protocol that collects and records metadata about IP traffic flows passing through routers and switches. Each flow record includes source/destination IPs, ports, protocol, byte count, and timestamps. NetFlow data enables traffic analysis without capturing full packet contents.
Why NetFlow Matters for Your Cybersecurity Career
NetFlow is a primary data source for network security monitoring. SOC analysts query NetFlow records to identify unusual traffic patterns, data exfiltration, and lateral movement. Unlike full packet capture, NetFlow is lightweight enough to retain for weeks or months, giving analysts a historical view of network behavior.
Which Cybersecurity Roles Use NetFlow?
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NetFlow is a Cisco-developed protocol that collects and records metadata about IP traffic flows passing through routers and switches. Each flow record includes source/destination IPs, ports, protocol, byte count, and timestamps. NetFlow data enables traffic analysis without capturing full packet contents.
NetFlow is a primary data source for network security monitoring. SOC analysts query NetFlow records to identify unusual traffic patterns, data exfiltration, and lateral movement. Unlike full packet capture, NetFlow is lightweight enough to retain for weeks or months, giving analysts a historical view of network behavior.
Cybersecurity professionals who work with NetFlow include SOC Analyst, Threat Intelligence Analyst, Incident Responder, Security Engineer. These roles apply NetFlow knowledge within the Networking & Infrastructure domain.
Sources
Definitions are original explanations written for career development purposes. For authoritative technical definitions, refer to NIST, ISO, or the relevant standards body.
Last verified: April 2026?Report an inaccuracy
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