![]() These connections send information over in units of communication called packets, that can be allowed or blocked based on the firewall.Īcceptable data can come from trusted sources, or IP addresses. Otherwise, the only allowed connections are those that a firewall has been configured to accept. If you’ve had to allow an exception when trying to access a website, you’re changing the rules of a firewall. These rules are determined by the user and can change based on how the user defines dangerous activity. If the firewall determines that the data is harmful, it isn’t allowed in.Įach firewall has its own set of rules about which data is and isn’t allowed into a network. It filters the data as it enters your network and analyzes it for information about where it came from, where it’s trying to go, and its content. ![]() Only instead of approved guests, the firewall allows in approved data, like a webpage or an email. ![]() Learn More How Does a Firewall Work?Ī firewall acts like a security guard outside a party with a list.
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