04/03/2021
Firewall
computer hardware or software — that can help protect your network by filtering traffic and blocking outsiders from gaining unauthorized access to the private data on your computer.
Not only does a firewall block unwanted traffic, it can also help block malicious software from infecting your computer.
Firewalls can provide different levels of protection. They key is determining how much protection you need.
Firewalls represent a first line of defense in home network security.
Your home network is only as secure as its least protected device. That’s where a network security system comes in.
A firewall shouldn’t be your only consideration for securing your home network. It’s important to make sure all of your internet-enabled devices — including mobile devices — have the latest operating system, web browsers, and security software.
Another consideration? Securing your wireless router. This might include changing the name of your router from the default ID and password it came with from the manufacturer, reviewing your security options, and setting up a guest network for visitors to your home.
What does a firewall do?
A firewall acts as a gatekeeper. It monitors attempts to gain access to your operating system and blocks unwanted traffic or unrecognized sources.
A firewall acts as a barrier or filter between your computer and another network such as the internet. You could think of a firewall as a traffic controller. It helps to protect your network and information by managing your network traffic, blocking unsolicited incoming network traffic, and validating access by assessing network traffic for anything malicious like hackers and malware.
Your operating system and your security software usually come with a pre-installed firewall. It’s a good idea to make sure those features are turned on. Also, make sure your security settings are configured to run updates automatically.
How does a firewall work?
To start, a firewalled system analyzes network traffic based on rules. A firewall only welcomes those incoming connections that it has been configured to accept. It does this by allowing or blocking specific data packets — units of communication you send over digital networks — based on pre-established security rules.
A firewall works like a traffic guard at your computer’s entry point, or port. Only trusted sources, or IP addresses, are allowed in. IP addresses are important because they identify a computer or source, just like your postal address identifies where you live.
