Final answer:
An Intrusion Detection System (IDS) is most suited for monitoring and providing information about network attacks without stopping them, serving as a surveillance system for potential threats.
Therefore, the correct answer is: option A). IDS
Step-by-step explanation:
An intrusion detection system is a device or software application that monitors a network or systems for malicious activity or policy violations.
Any intrusion activity or violation is typically reported either to an administrator or collected centrally using a security information and event management system.
The network device that is most suited for providing information about attacks against the network without stopping them is an Intrusion Detection System (IDS). Unlike an Intrusion Prevention System (IPS), which actively blocks attacks, an IDS serves as a surveillance system, offering insights without taking action.
A Layer 7 firewall, while sophisticated, is designed to block identified threats. Similarly, a RADIUS server is primarily used for authentication purposes rather than monitoring attacks.