AI driven: Automatically learn traffic patterns and dynamically adjust rules.

1. Core significance
(1) Access control
Function: Restrict unauthorized access through rule sets (such as ACLs) and only allow authorized traffic to pass through.

Example:

Prevent unauthorized external access to internal databases.

Only allow communication with specific IP addresses or ports (such as HTTP 80).

(2) Threat defense
Anti attack: Block common network attacks, such as:

DDoS attack: filtering abnormal traffic.

Port scanning: Blocking detection behavior.

Malicious software: prevents the spread of viruses and worms (requires IDS/IPS).

(3) Data privacy protection
Prevent data leakage: Monitor outbound traffic and block the transmission of sensitive information (such as customer data).

Encryption communication: Supports VPN (such as IPSec) to ensure remote access security.

(4) Network boundary division
Logical isolation: Establishing a barrier between a trusted network (internal network) and an untrusted network (external network).

DMZ zone protection: Protect servers that provide external services (such as web and email).

3. Actual application scenarios
Enterprise Network:

Isolate internal departments (such as restricting access to financial network segments).

Compliance requirements (such as GDPR, etc.).

Home network:

The router is equipped with a built-in firewall to prevent intrusion.

Parental control (blocking harmful websites).

Cloud computing:

The Security Group controls cloud server traffic.

Micro segmentation protects containers/VMs.