Final answer:
To uncover unauthorized devices on a network subnet, tools like Nmap or Network Access Control systems can be utilized for scanning and monitoring.
Step-by-step explanation:
To detect and manage devices on a network subnet, several tools and methods are available. One such method is to use network scanning tools like Nmap or advanced IP scanners. These tools can scan a network to detect all connected devices, including unauthorized ones. In an organizational scenario where insider threats are suspected, especially regarding non-approved devices connecting to the network, implementing a Network Access Control (NAC) solution would be beneficial. NAC systems aid in the identification, monitoring, and enforcement of access policies, effectively preventing unauthorized devices from gaining network access. Additionally, constantly monitoring the network traffic using intrusion detection systems (IDS) or intrusion prevention systems (IPS) can help in identifying suspicious patterns that may indicate malicious activity by an insider threat.
The tool that can help determine what devices exist on the same subnet of a network is a network scanning tool. These tools scan the network and provide a list of devices connected to the same subnet. One popular network scanning tool is Nmap.Nmap is a free and open-source network scanner that can be used to discover hosts on a network, and determine what services they are running. It can be used to scan a particular subnet and provide detailed information about each device found, such as the IP address, MAC address, and open ports.