Palomuuri
Palomuuri, Finnish for firewall, is a device, software, or combination of both that monitors and controls the flow of network traffic between computer networks according to a defined security policy. Its primary purpose is to create a barrier that separates trusted internal networks from untrusted external networks, such as the internet, while allowing legitimate communication to pass.
Firewalls can operate at various layers of the network stack and enforce rules based on source and
Common types include network firewalls deployed at network perimeters, host-based firewalls installed on individual devices, and
Deployment considerations include placement within the network, the default-deny principle, rule-set management, performance, and logging. Firewalls