COMPUTER NETWORKING

Detailed explanation-1: -The most basic type of firewall is a packet-filtering device, also known as a screening router. Packet-filtering firewalls are routers that operate in the low levels of a network protocol stack.

Detailed explanation-2: -Firewalls are network security systems that prevent unauthorized access to a network. It can be a hardware or software unit that filters the incoming and outgoing traffic within a private network, according to a set of rules to spot and prevent cyberattacks. Firewalls are used in enterprise and personal settings.

Detailed explanation-3: -The process is used in conjunction with packet mangling and Network Address Translation (NAT). Packet filtering is often part of a firewall program for protecting a local network from unwanted intrusion. In a software firewall, packet filtering is done by a program called a packet filter.

Detailed explanation-4: -Packet-filtering firewall. A packet-filtering firewall is a primary and simple type of network security firewall. It has filters that compare incoming and outgoing packets against a standard set of rules to decide whether to allow them to pass through.

Detailed explanation-5: -Virtual firewalls The firewall is situated between the VMs and the hypervisor that provides the virtualization layer and inspects traffic at the network layer to determine whether to allow or block packets based on a set of predefined rules.