Which tool sends outgoing signals back into the same RJ-45 Ethernet port so that diagnostic software can confirm the network interface card (NIC) is transmitting and receiving correctly?
A loopback plug internally connects the transmit and receive pins of the RJ-45 connector, creating a closed circuit that lets test software compare sent and received data. This verifies that the NIC's physical port is functioning.
Cable testers check continuity and pinout of an entire cable run, not the NIC itself.
A cable crimper attaches connectors to cable ends.
A voltage (multi)meter measures electrical characteristics but is not designed for NIC port testing.
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