Host A and Host B are connected to the same switch and Host

Host A and Host B are connected to the same switch, and Host A sends a message to Host B. When the switch starts receiving the bits, it reads the destination MAC address, determines the port Host B is on, and immediately opens a channel to that port while bits are still being received. Which switch mode is being used?

A. Cut through

B. Store and forward

C. Fragment free

D. Full duplex

Solution

A is correct. Cut-through switches begin delivering the frame as soon as a destination address is discovered.

B, C, and D are incorrect. B is incorrect because store-and-forward switches receive the entire frame before forwarding, injecting additional latency but examining it for errors. C is incorrect because fragment free reads the first 64 bytes of the frame before delivering it, thus reducing collision errors and bad frame propagation. B is incorrect because full duplex does not apply in this scenario.