Question

write  a variety of common firewall types(personal, commercial,

Answer 1

Firewalls are considered as one of the important security features which helps organizations to secure their infrastructure from outside threats. Here are few varieties of common firewall types:

• Packet-Filetring firewalls: This is the most basic and oldest type of the firewall architecture. This packet filtering firewall usually creates a checkpoint at the network level. This firewall performs simple checks of the data packet entering into the network. It even inspects the information such as the destination and the origin IP address, port number, etc.
• Circuit-level gateway: This is another firewall type that are meant to quickly and easily deny or accept the traffic without even consuming significant computing resources. It actually verifies the TCP protocol handshake and even makes sure that the entire session and the packets are legitimate.
• Stateful Inspection Firewalls: This is a commercial level firewall which basically combines both the packet inspection and even checks the TCP handshake verification in order to create a level of protection greater than the personal level firewall types.
• Proxy firewalls: this is another commercial level firewall which is basically implemented on the application level. This firewall actually filters the incoming traffic entering into the application between the network and the traffic source. Hence the name is the application level gateway.