(ISC)2 Certified in Cybersecurity Practice Exam

Which of the following is commonly used for providing an additional layer of security on wired networks?

1. WPA

2. Firewall

3. VPN

4. Switch

The correct answer is: Firewall

A firewall serves an essential function in enhancing security on wired networks by monitoring and controlling incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted internal network and untrusted external networks, effectively reducing the risk of unauthorized access, attacks, and data breaches. Firewalls can be implemented as hardware devices or software applications, allowing organizations to establish a secure perimeter around their network. They can filter traffic, block malicious content, and prevent harmful communications, thereby offering a robust line of defense. In contrast, while other options might provide security aspects—WPA is primarily associated with securing wireless networks, VPNs enhance security for remote connections, and switches are mainly concerned with directing network traffic rather than securing it—none of them offer the same level of protective measures specifically tailored for wired environments as a firewall does. Therefore, the correct response highlights the critical role that firewalls hold in maintaining the integrity and security of wired networks.