What is a ‘Firewall’ in the context of network security?

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**Solution:**

1. A firewall is a security mechanism that can be either software-based or hardware-based.

2. Its primary function is to filter and control incoming and outgoing network traffic based on predetermined security rules.

3. It helps protect networks from unauthorized access and potential threats.

4. It is not a file management application, malware, or a device to boost network performance.

**Answer:** A security mechanism that filters and controls network traffic.

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