Question: In Stop and wait protocol, sender wait for ACK before sending next packet. But what if an ACK is dropped in the network and never

  1. In Stop and wait protocol, sender wait for ACK before sending next packet. But what if an ACK is dropped in the network and never reached to sender. What sender should do in that case?
  2. A sender process transmits 100 packets towards destination process. Out of 100, 80 packets successfully reach the destination whereas 20 packets drop in the network. How many ACKs will be sent by the receiver towards sender while using:
  • ACK (positive/ normal ACK)
  • NACK

Why do we need length field in UDP header when we know that the length of the UDP header is always fixed (i.e. 8 Bytes)?

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