What action does the sender receive after all packets are confirmed as received in TCP/IP?

In TCP/IP, once all packets have been successfully received and acknowledged by the recipient, the sender receives a confirmation of successful packet delivery. This confirmation typically takes the form of an acknowledgment (ACK) message for each packet received, which informs the sender that the data has been correctly received without errors.

The acknowledgment mechanism is a fundamental aspect of the Transmission Control Protocol (TCP), designed to ensure reliable communication over the network. If the sender does not receive this confirmation within a specified time, it assumes that the packet may have been lost or corrupted during transmission and will then retransmit the packet. However, when all packets are confirmed, the successful delivery confirmation indicates that the data has been transmitted correctly and enables the sender to continue with the next set of data or terminate the connection.

Therefore, the correct response is a confirmation of successful packet delivery, which reflects the reliable nature of the TCP protocol.