What tool could Rudyard use to monitor potential FTP traffic running on port 80?

To monitor potential FTP traffic running on port 80, using a network protocol analyzer like Wireshark is particularly effective. Wireshark captures and analyzes network packets in real time, which allows users to see the details of the traffic passing through a specific network interface. This capability is crucial for monitoring any traffic associated with protocols, including FTP, even if it is operating over port 80, which is commonly associated with web traffic (HTTP).

Wireshark's ability to filter and dissect packets makes it possible to identify and analyze different types of traffic, including user sessions and file transfers, regardless of their port assignments or protocols. This functionality is vital for troubleshooting, performance monitoring, and security analysis on a network. In contrast, the other tools listed serve different purposes: a LAN cable tester is used primarily for verifying physical network connections; a port scanner checks for open ports and services on devices but does not analyze packet content; and a network bridge connects different network segments but does not provide any insight into the actual data being transmitted. Therefore, Wireshark is the most suitable tool for this specific monitoring task.