Firewall is a security mechanism used to protect networks from unauthorized access, intrusion, and damage. A firewall protects a network by screening incoming traffic and allowing approved traffic through.
Firewall devices can be installed at the perimeter of a network, between two networks, or on a single computer.
A firewall can be classified by its function, which is to protect a network. The three main types of firewalls are perimeter, layer 2, and layer 3.
A perimeter firewall protects the network by denying access to unauthorized users and devices. A layer 2 firewall filters traffic at the network layer, while a layer 3 firewall filters traffic at the application layer.
A firewall can also be classified by the type of protocol it protects. A firewall can protect traffic using TCP, UDP, ICMP, IP, and MAC addresses.
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Firewall in Linux is a set of rules that allow or block traffic between your computer and the outside world. A firewall can protect your computer from unauthorized access, viruses, and other online threats. Linux includes a default firewall that is enabled by default.
Linux has a firewall to protect the operating system and its users from malicious attacks. The firewall is a set of rules that determine which traffic is allowed to pass through the system and which is blocked. The firewall is enabled by default in most distributions, and it is important to understand how it works and how to use it to protect your computer.
Firewall technology is used in network security to protect systems from unauthorized access, intrusion, and data theft. The three primary firewall types are network perimeter firewalls, host-based firewalls, and network intrusion detection systems. Network perimeter firewalls protect system networks from threats that originate from outside the network.
