Which Interface Counter Increments? | Cisco Exam 200-301-CCNA Solution

C.

The correct answer is B. collision.

When two stations transmit frames at the same time, it is called a collision. In Ethernet networks, a device listens to the network before transmitting to make sure that no other device is transmitting at the same time. This is called Carrier Sense Multiple Access with Collision Detection (CSMA/CD). However, if two devices transmit at the same time, their signals collide and the frames become corrupted.

In this scenario, the collision occurs after the first 64 bytes of the frame is received. This means that the device was able to detect the collision after it had started receiving the frame. In Ethernet networks, collisions are detected by comparing the transmitted signal with the received signal. When a collision occurs, the transmitting devices will stop transmitting and wait for a random amount of time before trying to transmit again.

The interface counter that increments when a collision occurs is the collision counter. This counter keeps track of the number of collisions that have occurred on the interface. A high number of collisions can indicate a problem with the network, such as too many devices on the network or cable issues.

The other options are not correct in this scenario. A runt is a frame that is less than the minimum Ethernet frame size of 64 bytes. A late collision occurs when a collision is detected after 512 bits (64 bytes) of the frame have been transmitted. A CRC error occurs when the cyclic redundancy check (CRC) value in the frame is incorrect, indicating that the frame has been corrupted during transmission.