TYPES OF FIREWALLS
Firewalls can be software, hardware, with each type of firewall architecture having its own unique pros and cons. A firewall works by filtering the incoming network data, according to a set of rules known as an access control list. These rules will either allow or deny permission based on IP Address, domain names, protocols, programs, ports and keywords.
PACKET FILTERS FIREWALL
Packet filters are the most affordable type of firewall making it beneficial for small networks. Packet Filter Firewall controls your private network access by analyzing outgoing and incoming packets. The packet filtering technique will inspect the source and destination IP as well as port addresses contained in each TCP/IP (Transmission Control Protocol/Internet Protocol packet). It will allow a packet pass or block, according to specific criteria including allowed IP addresses, packet type and port number.
Packet Filter Firewalls are not recommended for larger business networks with more complex administration. As these types of firewalls cannot prevent all types of attacks. They are unable to defend against attacks using application layers vulnerabilities and spoofing attacks.
STATEFUL PACKET INSECTION (SPI)
Stateful Packet Inspection (SPI), is also known as dynamic packet filtering. This is a powerful firewall architecture which examines traffic streams from end to end. This type of firewall uses an intelligent way to ward off the unauthorized traffic by analyzing the packet headers and inspecting the state of the packets along with providing proxy services. These firewalls work at the network layer in the OSI model and are more secure than the basic packet filtering firewalls.
PROXY SERVER FIREWALLS
Proxy Server Firewalls which are also known as application level gateways, are the most secure type of firewalls. They work by filtering messages at the application layer. Proxy firewalls will hide your IP address and limit traffic types. They offer a complete and protocol-aware security analysis for the protocols they support. Proxy Servers are a good option for businesses looking for the best online experience and results in the network performance improvements.
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