技術者はデスクトップ PC で作業しており、その NIC が機能していることを確認したいと考えています。技術者は次のうちどれを使用する必要がありますか?
正解:B
A loopback plug is a device that can be used to test the functionality of a network interface card (NIC) by sending and receiving data packets from itself. The loopback plug connects to the NIC's port and simulates a network connection without requiring another device or cable. The technician can use a loopback plug to verify that the NIC is able to transmit and receive data without errors or interruptions. Reference: https://www.comptia.org/training/books/a-core-1-220-1101-study-guide (page 76)