1 Chapter 3 - 1 Chapter 3 1 What is the difference between...

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1 C h a p t er 3 1 What is the difference between connectionless demultiplexing and connection- oriented demultiplexing? With a connectionless demultiplexing, the UDP socket is identified by two-tuple (dest IP address, dest port number). On the other hand, a connection-oriented demultiplexing has the TCP socket identified by 4-tuple (source IP address, source port number, dest IP address, and dest port number). 2 Describe in detail the purpose of the following techniques used in reliable data transfer: (a) ACK, (b) sequence number, (c) timeout. ACK: receiver explicitly tells sender that packet received OK as a way to recover from errors. Sequence number: To handle duplicates, the sender transmits current pkt if ACK/NAK garbled, then the sender adds sequence number to each pkt, in which after that the receiver discards (doesn’t deliver up) duplicate pkt. Timeout: the time out happens when the timer to receive a packet is up, and there
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