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Firewalls are the cornerstone of perimeter security and typically the first line of defence in any network security architecture. They control which traffic is allowed to enter and leave the network based on a defined set of rules.
A firewall is a network security device — hardware, software, or both — that monitors and filters incoming and outgoing network traffic based on predefined security rules. It establishes a barrier between a trusted internal network and untrusted external networks.
| Generation | Type | Capabilities |
|---|---|---|
| 1st Gen | Packet Filter | Inspects headers only (IP, port, protocol) |
| 2nd Gen | Stateful Inspection | Tracks connection state (SYN, ACK, FIN) |
| 3rd Gen | Application Layer (Proxy) | Inspects application data, acts as intermediary |
| 4th Gen | Next-Generation Firewall (NGFW) | Deep packet inspection, IPS, application awareness, TLS inspection |
| Cloud Era | Cloud Firewall / FWaaS | Firewall-as-a-Service delivered from the cloud |
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