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what roles does a firewall perform?

Hardware firewalls are often integrated into broadband routers or can be purchased separately. They are like a bridge between the private and the global network. For the best protection, several firewalls can be applied.

The software firewall does not require the purchase of additional equipment, but the installation of a program. All you have to do is download it and install it on your computer. There are also firewalls already implemented on devices. The software firewall can be customized and new rules can be created to protect your computer from the risk of infiltration. 

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Both software and hardware firewalls can be just as effective. Of course, combining them, plus an antivirus program, is the most recommended solution.

Traffic filtering techniques
There are several types of firewalls that use various techniques to filter safe and potentially dangerous traffic. Here are the four basic ways to filter traffic:

Packet filtering

This is one of the initial filtering techniques, also known as stateless firewall. This filter inspects the Transport Control Protocol (TPS) packet or traffic to determine if it is secure and enters the default rule. Such programs require manual configuration, so you may need specialized help. In this case, it is advisable to opt for automated options.

Gateway application

This automatic filtering technique analyzes the transmitted data and applies traffic rules for certain applications or services. Its main disadvantage is that it negatively affects the performance of the system, although the technique itself is extremely efficient.

Proxy server

This technique intercepts and modifies all incoming and outgoing data so as not to display the true network address. 

Many firewalls simultaneously use these techniques to provide the best protection.

There are also other ways of filtering that help protect the systems.

Read More:  cisco firewall certification

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