A systems administrator notices a high number of collisions on a Linux-based server's Ethernet interface, which is connected to an office LAN. The collisions are causing noticeable performance degradation. While investigating the cause, what should the administrator check first to resolve the issue?
Collisions occur on half-duplex Ethernet links when two devices transmit at the same time. A very common reason for seeing collisions on a modern switched network is a duplex mismatch: one side of the link is operating in full duplex while the other is in half duplex. Verifying and correcting the switch-port duplex setting (and the server NIC setting) is therefore the first troubleshooting step. Router ACLs, RAM size, or even NIC driver updates will not eliminate collisions caused by a duplex mismatch.
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