Exam 200-301 topic 1 question 831 discussion

Isn't the duplex mismatch a better option due to high # of collisions?

C is clearly incorrect because if that were the case we would see output drops and there are zero output drops.

This is B Output errors: Output errors indicate errors, such as collisions, during the transmission of a frame. In most Ethernet-based networks, full-duplex transmission is the norm, and half-duplex transmission is the exception. In full-duplex transmission, operation collisions cannot occur. Therefore, collisions, especially late collisions, often indicate duplex mismatches.

The output queue is 0/40 and there are no total output drops, indicating the link is not over-utilized. That eliminates D. The queueing strategy is RED and the lack of drops rules out C. The default MTU size is 1500 bytes, which rules out A. That leaves B. If there was any remaining uncertainty, the huge amount of collisions can't be caused by D or C, but can absolutely be caused by B, a duplex mismatch. It's 100% B.

There are a lot of collisions and the interface is setup to 10 Mbps.

The output shows that there are 15000 collisions on the interface, indicating a duplex mismatch issue between Router1 and the switch. Therefore, the correct answer is B.

Hardware in Lance: La operacion normal de este tipo de hardware es Half Duplex. El contador 179 deferred se incrementa cuando hay interrupcion en el envio de data porque el otro extremo esta full duplex y hay mismatch en la negociacion.

The interface registers a lot of traffic, it is the only one that makes sense

'There is a duplex mismatch. ' sounds better for me, so "B".