FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -A firewall is a system designed to prevent unauthorized access to or from a private network. You can implement a firewall in either hardware or software form, or in a combination of both. Firewalls prevent unauthorized internet users from accessing private networks connected to the internet, especially intranets.

Detailed explanation-2: -To start, a firewalled system analyzes network traffic based on rules. A firewall only welcomes those incoming connections that it has been configured to accept. It does this by allowing or blocking specific data packets-units of communication you send over digital networks-based on pre-established security rules.

Detailed explanation-3: -Proxy Firewalls. A proxy firewall (or application-level gateway) serves as an intermediate between internal and external systems. These firewalls protect a network by masking client requests before sending them to the host. Proxy firewalls operate at the app layer, the highest level of the OSI model.

Detailed explanation-4: -A firewall acts as a gateway that passes data between the networks. A firewall acts as a barrier when the firewall blocks the free passage of data to and from the network. The firewall requires a user on the internal network to log in to the firewall system to access hosts on remote networks.

Detailed explanation-5: -The firewall works by filtering the incoming network data by looking at IP address, Protocol, Destination, Domain names, Keywords, Port, etc. Based on this, either allows or denies permission. The network administrator determines and customises these rules.