FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -An Application layer firewall (also referred to as an Application level gateway or proxy) makes security decisions based on information contained within the data portion of a packet.

Detailed explanation-2: -Packet-filtering firewalls make processing decisions based on network addresses, ports, or protocols. Packet-filtering firewalls are very fast because there is not much logic going behind the decisions they make. They do not do any internal inspection of the traffic.

Detailed explanation-3: -A next-generation firewall has the ability to filter packets based on applications and to inspect the data contained in packets (rather than just their IP headers).

Detailed explanation-4: -Packet Filtering Firewalls Packet filtering firewalls are the oldest, most basic type of firewalls. Operating at the network layer, they check a data packet for its source IP and destination IP, the protocol, source port, and destination port against predefined rules to determine whether to pass or discard the packet.

Detailed explanation-5: -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.