Store and forward switches receive an entire packet before they begin sending any data at all. Cut through switches can receive the first few bytes of a packet, decide which port(s) to send it on, and then start sending out the packet while the rest of the packet is still being received.
Cut through switching only works if both ports are operating at the same speed. Cut through switching only works if the output port(s) happen to be available while a packet is being received.
asd
Hence, as a conclusion to the above comment, cut through flow control helps reduce the latency and also the size requirement of buffers, since now we do not need to store the full packet before commencing the transfer.
cluo1
The advantage of cut-through compared to Circuit-reserve approach is that all the links will be acquired when needed and released immediately after used.
themj
The checksum bits at the end of the packet check if all of the parts of the message have arrived?
panda
Under high contention, a cut-through router may take a while to reserve the next link for a packet (since so many routers are fighting for it), so while it's waiting to get unblocked, the rest of the packet can continue getting sent over. If the entire packet gets sent over, it essentially degenerates to a store-and-forward scheme since the entire packet is sent over before it can move on.
fxffx
Cut-through routing reduces to store-and-forward under high contention because when the link is busy, the tail of the pack may arrive when the head of packet can't start to be send to next link. In that case, it's equivalent to store-and-forward.
Store and forward switches receive an entire packet before they begin sending any data at all. Cut through switches can receive the first few bytes of a packet, decide which port(s) to send it on, and then start sending out the packet while the rest of the packet is still being received.
Cut through switching only works if both ports are operating at the same speed. Cut through switching only works if the output port(s) happen to be available while a packet is being received.
Hence, as a conclusion to the above comment, cut through flow control helps reduce the latency and also the size requirement of buffers, since now we do not need to store the full packet before commencing the transfer.
The advantage of cut-through compared to Circuit-reserve approach is that all the links will be acquired when needed and released immediately after used.
The checksum bits at the end of the packet check if all of the parts of the message have arrived?
Under high contention, a cut-through router may take a while to reserve the next link for a packet (since so many routers are fighting for it), so while it's waiting to get unblocked, the rest of the packet can continue getting sent over. If the entire packet gets sent over, it essentially degenerates to a store-and-forward scheme since the entire packet is sent over before it can move on.
Cut-through routing reduces to store-and-forward under high contention because when the link is busy, the tail of the pack may arrive when the head of packet can't start to be send to next link. In that case, it's equivalent to store-and-forward.