palomuureiden

Palomuuri, often translated as firewall, is a network security device or software that monitors and controls incoming and outgoing network traffic based on predetermined security rules. Its primary purpose is to establish a barrier between a trusted internal network and an untrusted external network, such as the internet. Palomuuri examines data packets and decides whether to allow them to pass or block them based on defined criteria.

There are various types of palomuurit, including network-based firewalls and host-based firewalls. Network-based firewalls are typically hardware appliances that sit at the perimeter of a network, while host-based firewalls are software programs installed on individual computers. Palomuurit can operate at different layers of the network model, such as the network layer or the application layer, employing techniques like packet filtering, stateful inspection, and proxy services to enforce security policies. They are a fundamental component of network security, helping to prevent unauthorized access, malware infections, and other cyber threats.