Question

in congestion avoidance algorithm,if the size of the congestion window (cwnd)=1 at starting,then what is the size of cwnd after round 3?​

Answer 1

Answer:

TCP uses a congestion window and a congestion policy that avoid congestion.Previously, we assumed that only receiver can dictate the sender’s window size. We ignored another entity here, the network. If the network cannot deliver the data as fast as it is created by the sender, it must tell the sender to slow down. In other words, in addition to the receiver, the network is a second entity that determines the size of the sender’s windows.

Answer 2

if the size of the congestion window (cwnd)=1 at starting,then what is the size of cwnd:

• To prevent congestion, TCP uses a congestion window and a congestion policy. Prior until now, we believed that the sender's window size could only be determined by the receiver. We disregarded the network, another entity present.
• The transmitter must slow down if the network cannot transport the data as quickly as it is being created by it. In other words, the network is a second entity, in addition to the receiver, that controls the size of the sender's windows.

1. After 1 round trip time, congestion window size = (2)1 = 2 MSS.
2. After 2 round trip time, congestion window size = (2)2 = 4 MSS.
3. After 3 round trip time, congestion window size = (2)3 = 8 MSS .

• TCP can manage and prevent network congestion by using the congestion window (cwnd) and the receiver window (rwnd). The congestion window, which is maintained by the source, determines how much data can be sent across a TCP connection.

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