System users are being randomly disconnected from a server.

The correct answer is B. Replace the NIC because the output clearly indicates a hardware-level network issue, specifically with the network interface card (NIC). The ping results show 96% packet loss, which is extremely high and suggests severe communication failure between the system and the gateway. While packet loss can be caused by various issues, the key evidence comes from the ip -s link show output.

The interface statistics show a very large number of RX (receive) and TX (transmit) errors, which are abnormal and indicate that packets are being corrupted or dropped at the hardware or driver level. In a properly functioning interface, error counts should remain very low or zero. Such high error rates strongly suggest a failing NIC, faulty cable, or physical connection issue. Among the provided options, replacing the NIC is the most direct and appropriate solution.

Option A (Assign a proper gateway) is incorrect because the routing table already shows a valid default gateway (192.168.1.1). The system is able to send packets, but they are being lost due to errors, not misrouting. Option C (Increase the ping ' s TTL) is incorrect because TTL affects how long packets can traverse networks, not packet loss due to hardware errors. Option D (Increase the MTU size) is also incorrect because MTU mismatches typically cause fragmentation issues, not massive RX/TX errors.

In Linux troubleshooting, analyzing interface statistics using ip -s link is a critical skill. High error counters are a strong indicator of physical or hardware faults. Therefore, replacing the NIC (or checking cables and hardware) is the correct action to restore reliable network connectivity.