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A firewall is a set of products that protects the internal network from external threats.
- The firewall allows traffic in or out of the network based on a set of rules.
- A successful firewall should become a network choke point.
- A firewall can be made up of more than one network device or service.
- There are several types: packet filter, application gateway, circuit-level gateway, and proxy server.
- A firewall may be able to provide a Virtual Private Network solution.
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