Final answer:
The two categories of network firewalls are hardware firewalls and software firewalls.
Step-by-step explanation:
The two categories of network firewalls are hardware firewalls and software firewalls.
A hardware firewall is a physical device that sits between a local network and the internet, and it filters network traffic based on predetermined rules. It provides a strong level of security and is typically used by large organizations.
A software firewall is a program that runs on a computer and monitors network traffic. It can be configured to block or allow specific types of traffic. Software firewalls are commonly used by individual users on their personal computers.