What does a firewall do?

• A. Increases internet speed
• B. Monitors internet browsing history
• C. Protects a network from unauthorized access
• D. Creates a backup of data

Answer: (C)

A firewall is a crucial security component in network management that primarily serves to protect a network from unauthorized access. It acts as a barrier between your internal network and external threats, such as hackers and malicious software. By monitoring incoming and outgoing traffic, the firewall can filter data packets based on predefined security rules. This ensures that only authorized users or applications can access the network, significantly reducing the risk of data breaches and cyberattacks.

In contrast, other options do not accurately describe the primary function of a firewall. For instance, increasing internet speed, monitoring browsing history, and creating data backups are tasks that fall under different categories of network management or user activity tracking, none of which are the main purpose of a firewall. Thus, the ability of a firewall to protect against unauthorized access is what fundamentally defines its role in network security.