Which Interface Counter Increments? | Cisco Exam 200-301
Question
A device detects two stations transmitting frames at the same time. This condition occurs after the first 64 bytes of the frame is received. Which interface counter increments?
Answers
Explanations
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A. B. C. D.C
When two stations transmit frames at the same time, it is known as a collision. In Ethernet networks, collisions can occur due to the shared medium nature of the network.
When a collision occurs, the transmitting stations stop sending data and wait for a random time before attempting to transmit again. This process is known as collision detection and is implemented by the carrier sense multiple access with collision detection (CSMA/CD) algorithm.
Coming to the given scenario, the question states that the collision occurs after the first 64 bytes of the frame are received. This means that the collision is detected during the transmission of the frame, and the interface has already received the first 64 bytes of the frame.
In Ethernet networks, the interface counters increment based on the type of error that occurs during transmission. In this scenario, the collision has occurred after the first 64 bytes of the frame, so the interface counter that increments is the late collision counter.
The late collision counter is used to track collisions that occur after the first 64 bytes of the frame are transmitted. Late collisions are a sign of a faulty network cable or an incorrectly configured network device.
Therefore, the correct answer to this question is C. Late collision.
