Packet retransmission is the re-sending of packets that have been damaged or lost during their initial transmission. ... Packet retransmission is possible because the original sender retains a copy of the data sent until receipt of data is confirmed.

What do you mean by retransmission?

Retransmission, essentially identical with Automatic repeat request (ARQ), is the resending of packets which have been either damaged or lost. ... Such networks are usually "unreliable", meaning they offer no guarantees that they will not delay, damage, or lose packets, or deliver them out of order.

What is TCP retransmission packets?

The TCP retransmission means resending the packets over the network that have been either lost or damaged. ... Here, reliable communication means that the protocol guarantees packet's delivery even if the data packet has been lost or damaged.