Which show interfaces error counter reflects frames that failed to send due to an error?

The output errors counter reflects the number of frames that failed to send from an interface due to various issues. This typically includes conditions such as collisions, buffer failures, or other problems that may prevent the successful transmission of packets over the network. When an interface attempts to transmit a frame but encounters an issue that prevents completion, it increments the output errors count.

Understanding the context for other options helps clarify why output errors is the most relevant choice. Input errors refer to frames that are received with errors on the incoming side, while the frame count doesn’t specifically indicate errors; instead, it shows the number of frames processed. Giants refer to frames that exceed the maximum size allowed and are discarded but do not necessarily indicate issues with sending frames successfully. Thus, output errors is the most accurate reflection of issues encountered when transmitting frames.