Consider each of the three congestion control algorithms that work in units of packets and that...
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Consider each of the three congestion control algorithms that work in units of packets and that start each connection with a congestion window equal to one packet. Assume an ACK is sent for each packet received in-order, and when a packet is lost, ACKS are not sent for the lost packet and the subsequent packets that were transmitted. The lost packet and the subsequent packets have to be retransmitted by the sender. Whenever there is a packet loss and the sender times out in a RTT, the congestion window size in the next RTT has to be reduced to half of its size in the current RTT. A. For simplicity, assume a perfect timeout mechanism that detects a lost packet exactly 1 RTT after it is transmitted. Also, assume the congestion window is always less than or equal to the advertised window, so flow control need not be considered. B. Consider the loss of packets with sequence numbers 8, 23, 36 and 48 in their first transmission attempt. Assume these packets are delivered successfully in their first retransmission attempt. C. Fill the table to indicate the RTTS and the sequence numbers of the packets sent. The sequence numbers of the packets sent range from 1 to 50. D. Compute the effective throughput achieved by this connection to send packets with sequence numbers 1 to 50, each packet holds 1KB of data and that the RTT = 100ms. Consider each of the three congestion control algorithms that work in units of packets and that start each connection with a congestion window equal to one packet. Assume an ACK is sent for each packet received in-order, and when a packet is lost, ACKS are not sent for the lost packet and the subsequent packets that were transmitted. The lost packet and the subsequent packets have to be retransmitted by the sender. Whenever there is a packet loss and the sender times out in a RTT, the congestion window size in the next RTT has to be reduced to half of its size in the current RTT. A. For simplicity, assume a perfect timeout mechanism that detects a lost packet exactly 1 RTT after it is transmitted. Also, assume the congestion window is always less than or equal to the advertised window, so flow control need not be considered. B. Consider the loss of packets with sequence numbers 8, 23, 36 and 48 in their first transmission attempt. Assume these packets are delivered successfully in their first retransmission attempt. C. Fill the table to indicate the RTTS and the sequence numbers of the packets sent. The sequence numbers of the packets sent range from 1 to 50. D. Compute the effective throughput achieved by this connection to send packets with sequence numbers 1 to 50, each packet holds 1KB of data and that the RTT = 100ms.
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The question seems to involve a hypothetical scenario for congestion control in a computer network specifically how a network handles lost packets and adapts its congestion window size CWND Since it i... View the full answer
Related Book For
Computer Networks A Systems Approach
ISBN: 9780128182000
6th Edition
Authors: Larry L. Peterson, Bruce S. Davie
Posted Date:
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