Why is it significant to have a firewall enabled on a computer?

Having a firewall enabled on a computer is crucial for several reasons, particularly in safeguarding the system against unauthorized access and potential threats. A firewall acts as a barrier between a trusted internal network and untrusted external networks, such as the internet. Its primary role is to monitor and control incoming and outgoing network traffic based on predetermined security rules.

By filtering traffic, the firewall helps to prevent malicious activities from reaching the computer. This includes blocking harmful incoming connections from potentially dangerous sources that could exploit vulnerabilities, install malware, or breach confidential data. It also assists in preventing unauthorized applications from sending sensitive information outside of the network. Thus, enabling a firewall is a foundational aspect of maintaining a secure computing environment.

Other options do not align with the primary function of a firewall. For instance, improving graphical performance or enhancing internet speed are related to hardware and software optimization, not security. Moreover, allowing all incoming traffic to flow freely contradicts the very purpose of a firewall, which is to restrict unauthorized access, thereby undermining system security. Therefore, the significance of enabling a firewall largely revolves around its protective capabilities against cyber threats and unauthorized access.