Network Defense Essentials (NDE) Practice Exam

Which network device is specifically designed to protect against unauthorized access and attacks?

1. Router

2. Firewall

3. Switch

4. Bridge

The correct answer is: Firewall

The network device specifically designed to protect against unauthorized access and attacks is a firewall. Firewalls serve as a security barrier between trusted internal networks and untrusted external networks (like the internet). They control incoming and outgoing network traffic based on predetermined security rules, helping to prevent unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software forms and are essential in establishing a security posture for networks. They inspect packets of data entering or leaving the network and can block potential malicious traffic, thereby providing a critical layer of defense against cyber threats such as malware and intrusion attempts. The operational framework of a firewall can also include features such as virtual private network (VPN) support and content filtering, further enhancing its ability to protect network integrity. Other options, such as routers, switches, and bridges, primarily facilitate network communication and data transmission rather than focusing on security measures. While routers can have some security features, their main function is to route traffic between networks. Switches operate at the data link layer and are used to connect devices within the same network, while bridges connect two or more network segments to function as a single network. None of these devices possess the specialized security features inherent to firewalls.