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Network Security

Firewalls and network tools blocking unauthorized access and threats

Fig. 196 · Portcullis

The field

At a glance

Definition

Firewalls and network tools blocking unauthorized access and threats

Technologies

Next-generation firewalls inspect traffic at the application layer. Micro-segmentation limits lateral movement within networks. Cloud-delivered security (SASE/SSE) protects distributed workforces. Network detection and response (NDR) uses AI to identify anomalous traffic patterns. SD-WAN integrates networking and security functions.

Applications

Next-gen firewalls inspect and filter application-layer traffic. Micro-segmentation prevents ransomware lateral movement. SASE provides secure access for remote workers. NDR detects data exfiltration and command-and-control communications.

Market and funding

The global network security market exceeded $25 billion in 2025. Every organization with a network needs protection.

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