A Local Area Network (LAN) Containing a switch with 8 ports which connects an NMS, a printer, a server, and hosts A, B, C, and D. The LAN is connected to Internet by router R. The following figure shows this LAN.

Ports 1 and 7 are down and the rest are up.

The NMS can detect that port 1 and port 7 are down using traps or monitoring tools. Explain these two methods. Which method can locate the exact port number?

Please I want a very brief answer.

NMS 1 2 3 4 Printer erver Internet Figure 1