What is a firewall? How they work and all about next-generation firewalls | Tips & Tricks

A firewall is a network device that monitors packets going in and out of networks and blocks or allows them according to rules that have been set up to define what traffic is permissible and what traffic isn’t.

There are several types of that have developed over the years, becoming progressively more complex over time and taking more parameters into consideration when determining whether traffic should or should not be allowed to pass. The most modern are commonly known as next-generation (NGF) and incorporate many other technologies beyond packet filtering.

Initially placed at the boundaries between trusted and untrusted networks, firewalls are now also deployed to protect internal segments of networks, such as data centers, from other segments of organizations’ networks.

Firewalls are commonly deployed as appliances built by individual vendors, but they can also be bought as virtual appliances – software that customers install on their own hardware.

Here are the major types of firewalls.

Proxy-based firewalls

These firewalls act as a gateway between end users who request data and the source of that data. Host devices connect to the proxy, and the proxy makes a separate connection to the source of the data. In response, source devices make connections to the proxy, and the proxy make a separate connection to the host device. Before passing on packets to a destination address, the proxy can filter them to enforce policies and mask the location of the recipient’s device, but also to protect the recipient’s device and network.

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