Scenario 2: When the packet is received but the acknowledgment is lost. Once the acknowledgment is received, retransmission will not occur again. When the packet is retransmitted, the acknowledgment is received.
When the timeout period expires, then the packet is resent again. In this scenario, the packet is sent to the receiver, but no acknowledgment is received within that timeout period. Scenario 1: When the data packet is lost or erroneous. Let's consider the following scenarios of retransmission. Here, the timer means that if no acknowledgment is received before the timer expires, the data packet is retransmitted. This lack of acknowledgment triggers a timer to timeout, which leads to the retransmission of data packets. Here, retransmission means the data packets have been lost, which leads to a lack of acknowledgment. The network which uses a combination of acknowledgment and retransmission of damaged or lost packets offers reliability. The networks are unreliable and do not guarantee the delay or the retransmission of the lost or damaged packets. Here, reliable communication means that the protocol guarantees packet's delivery even if the data packet has been lost or damaged.
Here, retransmission is a mechanism used by protocols such as TCP to provide reliable communication. The TCP retransmission means resending the packets over the network that have been either lost or damaged.
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