A late collision indicates that another system attempted to transmit after a host has transmitted at least the _______

A late collision indicates that another system attempted to transmit after a host has transmitted at least the _______

• A. First 64 bytes of its frame
• B. First 512 bytes
• C. Last 64 bytes
• D. First 128 bytes

Answer: (A)

In Ethernet networks using CSMA/CD, collisions must be detectable within a fixed window called the slot time, which corresponds to the minimum frame size. The minimum frame size is 64 bytes, which takes a certain amount of time to transmit (512 bit times at 10 Mbps). A late collision happens when another station starts transmitting after the first host has already put at least that much data on the wire, so the collision is detected later rather than within the initial portion of the frame. Therefore, the amount referenced is the first 64 bytes.

In Ethernet networks using CSMA/CD, collisions must be detectable within a fixed window called the slot time, which corresponds to the minimum frame size. The minimum frame size is 64 bytes, which takes a certain amount of time to transmit (512 bit times at 10 Mbps). A late collision happens when another station starts transmitting after the first host has already put at least that much data on the wire, so the collision is detected later rather than within the initial portion of the frame. Therefore, the amount referenced is the first 64 bytes.