技術者が古い PC をネットワークから取り外し、LAN に接続できない新しい PC と交換します。問題の原因として最も可能性が高いのはどれですか?
正解:A
It is most likely that the issue is caused by port security, as this is a feature that can prevent new devices from connecting to the LAN. Port tagging, port aggregation, and port mirroring are all features that are used to manage traffic on the network, but they are not related to the connectivity of new devices. If the technician has configured port security on the network and the new PC does not meet the security requirements, it will not be able to connect to the LAN.