Correct Answer. A. Verify that the Ethernet cable is securely plugged into both the computer and the wall socket Physical connection issues are the most common cause for a wired device not accessing the network. Ensuring that the cable is properly connected is a fundamental and simple first step.
Option B is incorrect. The issue is with the wired connection, not wireless, so checking Wi-Fi is irrelevant.
Option C is incorrect. Bandwidth allocation would affect speed, not initial network access.
Option D is incorrect. Firewall settings typically do not discriminate between connection types at the device level and would not affect just the wired connection.